task_name string | rows int64 | cols int64 | rules string | visual_elements string | initial_board string | solution string | initial_observation string | solution_reference string | description string | title string | hint string |
|---|---|---|---|---|---|---|---|---|---|---|---|
sudoku_normal_hard_100 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .94.5..16.2..19...1.54..9..4.9...1...5.14.69....97.4355...9.7..98......12....1..9 | 394857216628319547175426983439685172752143698861972435513298764987564321246731859 | . 9 4 . 5 . . 1 6
. 2 . . 1 9 . . .
1 . 5 4 . . 9 . .
4 . 9 . . . 1 . .
. 5 . 1 4 . 6 9 .
. . . 9 7 . 4 3 5
5 . . . 9 . 7 . .
9 8 . . . . . . 1
2 . . . . 1 . . 9 | 3 9 4 8 5 7 2 1 6
6 2 8 3 1 9 5 4 7
1 7 5 4 2 6 9 8 3
4 3 9 6 8 5 1 7 2
7 5 2 1 4 3 6 9 8
8 6 1 9 7 2 4 3 5
5 1 3 2 9 8 7 6 4
9 8 7 5 6 4 3 2 1
2 4 6 7 3 1 8 5 9 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4732_hard | 394857216628319547175426983439685172752143698861972435513298764987564321246731859 #1 Extreme (31972) bf
Hidden Single: r2c5=1
Hidden Single: r6c4=9
Hidden Single: r6c7=4
Hidden Single: r4c7=1
Locked Candidates Type 1 (Pointing): 4 in b3 => r2c3<>4
Hidden Rectangle: 1/6 in r6c23,r7c23 => r7c3<>6
Bru... |
sudoku_normal_extremely_hard_100 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ....5..16.2...9...1.54..9..4.9.......5.14........7..355...9.7...8......12....1... | 394857216628319547175426983439685172752143698861972435513298764987564321246731859 | . . . . 5 . . 1 6
. 2 . . . 9 . . .
1 . 5 4 . . 9 . .
4 . 9 . . . . . .
. 5 . 1 4 . . . .
. . . . 7 . . 3 5
5 . . . 9 . 7 . .
. 8 . . . . . . 1
2 . . . . 1 . . . | 3 9 4 8 5 7 2 1 6
6 2 8 3 1 9 5 4 7
1 7 5 4 2 6 9 8 3
4 3 9 6 8 5 1 7 2
7 5 2 1 4 3 6 9 8
8 6 1 9 7 2 4 3 5
5 1 3 2 9 8 7 6 4
9 8 7 5 6 4 3 2 1
2 4 6 7 3 1 8 5 9 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4732_hard | 394857216628319547175426983439685172752143698861972435513298764987564321246731859 #1 Extreme (31972) bf
Hidden Single: r2c5=1
Hidden Single: r6c4=9
Hidden Single: r6c7=4
Hidden Single: r4c7=1
Locked Candidates Type 1 (Pointing): 4 in b3 => r2c3<>4
Hidden Rectangle: 1/6 in r6c23,r7c23 => r7c3<>6
Bru... |
sudoku_normal_hard_101 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ..1..7..2....1..5.9..3..1...95683...624179....834526...4.79...1.19..4.7.5..8.19.. | 851967432436218759972345168795683214624179385183452697348796521219534876567821943 | . . 1 . . 7 . . 2
. . . . 1 . . 5 .
9 . . 3 . . 1 . .
. 9 5 6 8 3 . . .
6 2 4 1 7 9 . . .
. 8 3 4 5 2 6 . .
. 4 . 7 9 . . . 1
. 1 9 . . 4 . 7 .
5 . . 8 . 1 9 . . | 8 5 1 9 6 7 4 3 2
4 3 6 2 1 8 7 5 9
9 7 2 3 4 5 1 6 8
7 9 5 6 8 3 2 1 4
6 2 4 1 7 9 3 8 5
1 8 3 4 5 2 6 9 7
3 4 8 7 9 6 5 2 1
2 1 9 5 3 4 8 7 6
5 6 7 8 2 1 9 4 3 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4370_hard | 851967432436218759972345168795683214624179385183452697348796521219534876567821943 #1 Extreme (23442) bf
Brute Force: r5c5=7
Hidden Single: r7c4=7
Locked Candidates Type 1 (Pointing): 7 in b4 => r2c1<>7
Forcing Net Contradiction in r3 => r4c8<>8
r4c8=8 r4c8<>1 r4c1=1 r5c2<>1 r5c2=2 r5c3<>2 r5c3=4 r3c3<>4
... |
sudoku_normal_extremely_hard_101 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ..1..7..2....1..5.9..3..1...956.3...6.........83.526...4......1..9..4.7.5..8..9.. | 851967432436218759972345168795683214624179385183452697348796521219534876567821943 | . . 1 . . 7 . . 2
. . . . 1 . . 5 .
9 . . 3 . . 1 . .
. 9 5 6 . 3 . . .
6 . . . . . . . .
. 8 3 . 5 2 6 . .
. 4 . . . . . . 1
. . 9 . . 4 . 7 .
5 . . 8 . . 9 . . | 8 5 1 9 6 7 4 3 2
4 3 6 2 1 8 7 5 9
9 7 2 3 4 5 1 6 8
7 9 5 6 8 3 2 1 4
6 2 4 1 7 9 3 8 5
1 8 3 4 5 2 6 9 7
3 4 8 7 9 6 5 2 1
2 1 9 5 3 4 8 7 6
5 6 7 8 2 1 9 4 3 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4370_hard | 851967432436218759972345168795683214624179385183452697348796521219534876567821943 #1 Extreme (23442) bf
Brute Force: r5c5=7
Hidden Single: r7c4=7
Locked Candidates Type 1 (Pointing): 7 in b4 => r2c1<>7
Forcing Net Contradiction in r3 => r4c8<>8
r4c8=8 r4c8<>1 r4c1=1 r5c2<>1 r5c2=2 r5c3<>2 r5c3=4 r3c3<>4
... |
sudoku_normal_hard_102 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 7....8..3..5....6....65..1.3....4..8..7936.2..2.81.3...48..97..9.........73.....9 | 716298543835471962492653817369524178187936425524817396248369751951782634673145289 | 7 . . . . 8 . . 3
. . 5 . . . . 6 .
. . . 6 5 . . 1 .
3 . . . . 4 . . 8
. . 7 9 3 6 . 2 .
. 2 . 8 1 . 3 . .
. 4 8 . . 9 7 . .
9 . . . . . . . .
. 7 3 . . . . . 9 | 7 1 6 2 9 8 5 4 3
8 3 5 4 7 1 9 6 2
4 9 2 6 5 3 8 1 7
3 6 9 5 2 4 1 7 8
1 8 7 9 3 6 4 2 5
5 2 4 8 1 7 3 9 6
2 4 8 3 6 9 7 5 1
9 5 1 7 8 2 6 3 4
6 7 3 1 4 5 2 8 9 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4294_hard | 716298543835471962492653817369524178187936425524817396248369751951782634673145289 #1 Extreme (39912) bf
Locked Candidates Type 1 (Pointing): 7 in b3 => r6c9<>7
Locked Candidates Type 1 (Pointing): 8 in b3 => r89c7<>8
Brute Force: r5c5=3
Locked Candidates Type 1 (Pointing): 8 in b5 => r89c4<>8
Brute Force... |
sudoku_normal_extremely_hard_102 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 7....8..3..5....6....65..1.3....4..8..7....2..2..1.3...48..97..9.........73.....9 | 716298543835471962492653817369524178187936425524817396248369751951782634673145289 | 7 . . . . 8 . . 3
. . 5 . . . . 6 .
. . . 6 5 . . 1 .
3 . . . . 4 . . 8
. . 7 . . . . 2 .
. 2 . . 1 . 3 . .
. 4 8 . . 9 7 . .
9 . . . . . . . .
. 7 3 . . . . . 9 | 7 1 6 2 9 8 5 4 3
8 3 5 4 7 1 9 6 2
4 9 2 6 5 3 8 1 7
3 6 9 5 2 4 1 7 8
1 8 7 9 3 6 4 2 5
5 2 4 8 1 7 3 9 6
2 4 8 3 6 9 7 5 1
9 5 1 7 8 2 6 3 4
6 7 3 1 4 5 2 8 9 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4294_hard | 716298543835471962492653817369524178187936425524817396248369751951782634673145289 #1 Extreme (39912) bf
Locked Candidates Type 1 (Pointing): 7 in b3 => r6c9<>7
Locked Candidates Type 1 (Pointing): 8 in b3 => r89c7<>8
Brute Force: r5c5=3
Locked Candidates Type 1 (Pointing): 8 in b5 => r89c4<>8
Brute Force... |
sudoku_normal_hard_103 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .....4..2..812..3..7..689..5....92......8.....6..3...4.3..7.5....18.....4....3.2. | 153794862698125437274368951517649283349281675862537194936472518721856349485913726 | . . . . . 4 . . 2
. . 8 1 2 . . 3 .
. 7 . . 6 8 9 . .
5 . . . . 9 2 . .
. . . . 8 . . . .
. 6 . . 3 . . . 4
. 3 . . 7 . 5 . .
. . 1 8 . . . . .
4 . . . . 3 . 2 . | 1 5 3 7 9 4 8 6 2
6 9 8 1 2 5 4 3 7
2 7 4 3 6 8 9 5 1
5 1 7 6 4 9 2 8 3
3 4 9 2 8 1 6 7 5
8 6 2 5 3 7 1 9 4
9 3 6 4 7 2 5 1 8
7 2 1 8 5 6 3 4 9
4 8 5 9 1 3 7 2 6 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_7559_hard | 153794862698125437274368951517649283349281675862537194936472518721856349485913726 #1 Extreme (24512) bf
AIC: 3/4 4- r3c3 =4= r3c8 -4- r2c7 =4= r8c7 =3= r8c9 -3- r4c9 =3= r4c3 -3 => r3c3<>3, r4c3<>4
Brute Force: r5c5=8
Hidden Single: r3c6=8
Finned X-Wing: 8 c29 r49 fr7c9 => r9c7<>8
Forcing Net Contradicti... |
sudoku_normal_extremely_hard_103 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .....4..2..81...3..7..6.9..5....92............6..3...4.3..7.5....18.....4....3.2. | 153794862698125437274368951517649283349281675862537194936472518721856349485913726 | . . . . . 4 . . 2
. . 8 1 . . . 3 .
. 7 . . 6 . 9 . .
5 . . . . 9 2 . .
. . . . . . . . .
. 6 . . 3 . . . 4
. 3 . . 7 . 5 . .
. . 1 8 . . . . .
4 . . . . 3 . 2 . | 1 5 3 7 9 4 8 6 2
6 9 8 1 2 5 4 3 7
2 7 4 3 6 8 9 5 1
5 1 7 6 4 9 2 8 3
3 4 9 2 8 1 6 7 5
8 6 2 5 3 7 1 9 4
9 3 6 4 7 2 5 1 8
7 2 1 8 5 6 3 4 9
4 8 5 9 1 3 7 2 6 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_7559_hard | 153794862698125437274368951517649283349281675862537194936472518721856349485913726 #1 Extreme (24512) bf
AIC: 3/4 4- r3c3 =4= r3c8 -4- r2c7 =4= r8c7 =3= r8c9 -3- r4c9 =3= r4c3 -3 => r3c3<>3, r4c3<>4
Brute Force: r5c5=8
Hidden Single: r3c6=8
Finned X-Wing: 8 c29 r49 fr7c9 => r9c7<>8
Forcing Net Contradicti... |
sudoku_normal_hard_104 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 7..4...95.5.7.82....2.5....5...8.7..9.36.4581.1...5...2...4.95....5.3....45....6. | 786432195159768234432159678564381729923674581817295346271846953698523417345917862 | 7 . . 4 . . . 9 5
. 5 . 7 . 8 2 . .
. . 2 . 5 . . . .
5 . . . 8 . 7 . .
9 . 3 6 . 4 5 8 1
. 1 . . . 5 . . .
2 . . . 4 . 9 5 .
. . . 5 . 3 . . .
. 4 5 . . . . 6 . | 7 8 6 4 3 2 1 9 5
1 5 9 7 6 8 2 3 4
4 3 2 1 5 9 6 7 8
5 6 4 3 8 1 7 2 9
9 2 3 6 7 4 5 8 1
8 1 7 2 9 5 3 4 6
2 7 1 8 4 6 9 5 3
6 9 8 5 2 3 4 1 7
3 4 5 9 1 7 8 6 2 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_6940_hard | 786432195159768234432159678564381729923674581817295346271846953698523417345917862 #1 Extreme (39004) bf
Brute Force: r5c7=5
Hidden Single: r1c9=5
Hidden Single: r6c6=5
Hidden Single: r7c8=5
Brute Force: r5c6=4
Locked Candidates Type 1 (Pointing): 7 in b5 => r89c5<>7
Discontinuous Nice Loop: 9 r4c2 ... |
sudoku_normal_extremely_hard_104 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 7..4...9..5.7.82....2.5....5...8.7....36....1.1.......2...4.9.....5.3....45....6. | 786432195159768234432159678564381729923674581817295346271846953698523417345917862 | 7 . . 4 . . . 9 .
. 5 . 7 . 8 2 . .
. . 2 . 5 . . . .
5 . . . 8 . 7 . .
. . 3 6 . . . . 1
. 1 . . . . . . .
2 . . . 4 . 9 . .
. . . 5 . 3 . . .
. 4 5 . . . . 6 . | 7 8 6 4 3 2 1 9 5
1 5 9 7 6 8 2 3 4
4 3 2 1 5 9 6 7 8
5 6 4 3 8 1 7 2 9
9 2 3 6 7 4 5 8 1
8 1 7 2 9 5 3 4 6
2 7 1 8 4 6 9 5 3
6 9 8 5 2 3 4 1 7
3 4 5 9 1 7 8 6 2 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_6940_hard | 786432195159768234432159678564381729923674581817295346271846953698523417345917862 #1 Extreme (39004) bf
Brute Force: r5c7=5
Hidden Single: r1c9=5
Hidden Single: r6c6=5
Hidden Single: r7c8=5
Brute Force: r5c6=4
Locked Candidates Type 1 (Pointing): 7 in b5 => r89c5<>7
Discontinuous Nice Loop: 9 r4c2 ... |
sudoku_normal_hard_105 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 7...15..3..24...1..1...25....79...51...18...6.6125..9.17...9.4...9......42.7..... | 794615283532478619816392574287946351945183726361257498173569842659824137428731965 | 7 . . . 1 5 . . 3
. . 2 4 . . . 1 .
. 1 . . . 2 5 . .
. . 7 9 . . . 5 1
. . . 1 8 . . . 6
. 6 1 2 5 . . 9 .
1 7 . . . 9 . 4 .
. . 9 . . . . . .
4 2 . 7 . . . . . | 7 9 4 6 1 5 2 8 3
5 3 2 4 7 8 6 1 9
8 1 6 3 9 2 5 7 4
2 8 7 9 4 6 3 5 1
9 4 5 1 8 3 7 2 6
3 6 1 2 5 7 4 9 8
1 7 3 5 6 9 8 4 2
6 5 9 8 2 4 1 3 7
4 2 8 7 3 1 9 6 5 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_9172_hard | 794615283532478619816392574287946351945183726361257498173569842659824137428731965 #1 Extreme (20538) bf
Finned X-Wing: 2 c69 r38 fr7c9 => r8c78<>2
Brute Force: r5c4=1
Hidden Single: r1c5=1
Hidden Single: r6c5=5
Locked Candidates Type 1 (Pointing): 2 in b2 => r3c89<>2
Locked Candidates Type 1 (Pointing... |
sudoku_normal_extremely_hard_105 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 7....5..3..24...1..1....5....79...51....8...6.612...9.17...9.4...9......42.7..... | 794615283532478619816392574287946351945183726361257498173569842659824137428731965 | 7 . . . . 5 . . 3
. . 2 4 . . . 1 .
. 1 . . . . 5 . .
. . 7 9 . . . 5 1
. . . . 8 . . . 6
. 6 1 2 . . . 9 .
1 7 . . . 9 . 4 .
. . 9 . . . . . .
4 2 . 7 . . . . . | 7 9 4 6 1 5 2 8 3
5 3 2 4 7 8 6 1 9
8 1 6 3 9 2 5 7 4
2 8 7 9 4 6 3 5 1
9 4 5 1 8 3 7 2 6
3 6 1 2 5 7 4 9 8
1 7 3 5 6 9 8 4 2
6 5 9 8 2 4 1 3 7
4 2 8 7 3 1 9 6 5 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_9172_hard | 794615283532478619816392574287946351945183726361257498173569842659824137428731965 #1 Extreme (20538) bf
Finned X-Wing: 2 c69 r38 fr7c9 => r8c78<>2
Brute Force: r5c4=1
Hidden Single: r1c5=1
Hidden Single: r6c5=5
Locked Candidates Type 1 (Pointing): 2 in b2 => r3c89<>2
Locked Candidates Type 1 (Pointing... |
sudoku_normal_hard_106 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 7...816.........51.91........9.47...2.861.4...4..28..39...74.3..1.....4.4....68.. | 753481692824963751691752384569347128238619475147528963982174536316895247475236819 | 7 . . . 8 1 6 . .
. . . . . . . 5 1
. 9 1 . . . . . .
. . 9 . 4 7 . . .
2 . 8 6 1 . 4 . .
. 4 . . 2 8 . . 3
9 . . . 7 4 . 3 .
. 1 . . . . . 4 .
4 . . . . 6 8 . . | 7 5 3 4 8 1 6 9 2
8 2 4 9 6 3 7 5 1
6 9 1 7 5 2 3 8 4
5 6 9 3 4 7 1 2 8
2 3 8 6 1 9 4 7 5
1 4 7 5 2 8 9 6 3
9 8 2 1 7 4 5 3 6
3 1 6 8 9 5 2 4 7
4 7 5 2 3 6 8 1 9 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_3591_hard | 753481692824963751691752384569347128238619475147528963982174536316895247475236819 #1 Extreme (30012) bf
Locked Candidates Type 1 (Pointing): 8 in b3 => r3c13<>8
Locked Candidates Type 1 (Pointing): 6 in b9 => r4c9<>6
Brute Force: r5c3=8
Brute Force: r5c5=1
Grouped Discontinuous Nice Loop: 5 r3c3 -5- r1c2... |
sudoku_normal_extremely_hard_106 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 7...816.........51.9.........9.47...2..6..4...4..28..39...74.3..1.....4.4....68.. | 753481692824963751691752384569347128238619475147528963982174536316895247475236819 | 7 . . . 8 1 6 . .
. . . . . . . 5 1
. 9 . . . . . . .
. . 9 . 4 7 . . .
2 . . 6 . . 4 . .
. 4 . . 2 8 . . 3
9 . . . 7 4 . 3 .
. 1 . . . . . 4 .
4 . . . . 6 8 . . | 7 5 3 4 8 1 6 9 2
8 2 4 9 6 3 7 5 1
6 9 1 7 5 2 3 8 4
5 6 9 3 4 7 1 2 8
2 3 8 6 1 9 4 7 5
1 4 7 5 2 8 9 6 3
9 8 2 1 7 4 5 3 6
3 1 6 8 9 5 2 4 7
4 7 5 2 3 6 8 1 9 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_3591_hard | 753481692824963751691752384569347128238619475147528963982174536316895247475236819 #1 Extreme (30012) bf
Locked Candidates Type 1 (Pointing): 8 in b3 => r3c13<>8
Locked Candidates Type 1 (Pointing): 6 in b9 => r4c9<>6
Brute Force: r5c3=8
Brute Force: r5c5=1
Grouped Discontinuous Nice Loop: 5 r3c3 -5- r1c2... |
sudoku_normal_hard_107 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 5....2.6..1.65.4..2.67......6..2.854...5.6.39.5.4896..4.1.6..8..8......66.5...1.. | 574192368819653427236748915967321854148576239352489671421965783783214596695837142 | 5 . . . . 2 . 6 .
. 1 . 6 5 . 4 . .
2 . 6 7 . . . . .
. 6 . . 2 . 8 5 4
. . . 5 . 6 . 3 9
. 5 . 4 8 9 6 . .
4 . 1 . 6 . . 8 .
. 8 . . . . . . 6
6 . 5 . . . 1 . . | 5 7 4 1 9 2 3 6 8
8 1 9 6 5 3 4 2 7
2 3 6 7 4 8 9 1 5
9 6 7 3 2 1 8 5 4
1 4 8 5 7 6 2 3 9
3 5 2 4 8 9 6 7 1
4 2 1 9 6 5 7 8 3
7 8 3 2 1 4 5 9 6
6 9 5 8 3 7 1 4 2 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_3398_hard | 574192368819653427236748915967321854148576239352489671421965783783214596695837142 #1 Extreme (21512) bf
Hidden Single: r8c9=6
Hidden Single: r1c1=5
Brute Force: r5c4=5
Hidden Single: r4c8=5
Hidden Single: r5c6=6
Hidden Single: r2c4=6
Hidden Single: r3c3=6
Locked Candidates Type 1 (Pointing): 1 i... |
sudoku_normal_extremely_hard_107 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .....2.6..1..5.4..2..7......6..2.8.4.......39.5..896..4.1.6..8..8.......6.5...1.. | 574192368819653427236748915967321854148576239352489671421965783783214596695837142 | . . . . . 2 . 6 .
. 1 . . 5 . 4 . .
2 . . 7 . . . . .
. 6 . . 2 . 8 . 4
. . . . . . . 3 9
. 5 . . 8 9 6 . .
4 . 1 . 6 . . 8 .
. 8 . . . . . . .
6 . 5 . . . 1 . . | 5 7 4 1 9 2 3 6 8
8 1 9 6 5 3 4 2 7
2 3 6 7 4 8 9 1 5
9 6 7 3 2 1 8 5 4
1 4 8 5 7 6 2 3 9
3 5 2 4 8 9 6 7 1
4 2 1 9 6 5 7 8 3
7 8 3 2 1 4 5 9 6
6 9 5 8 3 7 1 4 2 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_3398_hard | 574192368819653427236748915967321854148576239352489671421965783783214596695837142 #1 Extreme (21512) bf
Hidden Single: r8c9=6
Hidden Single: r1c1=5
Brute Force: r5c4=5
Hidden Single: r4c8=5
Hidden Single: r5c6=6
Hidden Single: r2c4=6
Hidden Single: r3c3=6
Locked Candidates Type 1 (Pointing): 1 i... |
sudoku_normal_hard_108 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .8.6...7..74...9...3..8...2.2..7..5..6854...1.57..6.9..423......13..5...89..1...3 | 289634175674251938135987462421879356968543721357126894542398617713465289896712543 | . 8 . 6 . . . 7 .
. 7 4 . . . 9 . .
. 3 . . 8 . . . 2
. 2 . . 7 . . 5 .
. 6 8 5 4 . . . 1
. 5 7 . . 6 . 9 .
. 4 2 3 . . . . .
. 1 3 . . 5 . . .
8 9 . . 1 . . . 3 | 2 8 9 6 3 4 1 7 5
6 7 4 2 5 1 9 3 8
1 3 5 9 8 7 4 6 2
4 2 1 8 7 9 3 5 6
9 6 8 5 4 3 7 2 1
3 5 7 1 2 6 8 9 4
5 4 2 3 9 8 6 1 7
7 1 3 4 6 5 2 8 9
8 9 6 7 1 2 5 4 3 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_3585_hard | 289634175674251938135987462421879356968543721357126894542398617713465289896712543 #1 Extreme (26340) bf
Forcing Net Contradiction in r3 => r7c9<>6
r7c9=6 (r7c1<>6) (r7c5<>6 r7c5=9 r7c1<>9) (r7c5<>6 r8c5=6 r8c1<>6) r7c9<>9 r8c9=9 r8c1<>9 r8c1=7 r7c1<>7 r7c1=5 r3c1<>5
r7c9=6 (r7c9<>7) r7c9<>9 r8c9=9 (r8c1<>9 r8c1=... |
sudoku_normal_extremely_hard_108 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ...6...7...4...9...3..8...2....7..5...8.4...1.....6.9..423......13..5...8...1...3 | 289634175674251938135987462421879356968543721357126894542398617713465289896712543 | . . . 6 . . . 7 .
. . 4 . . . 9 . .
. 3 . . 8 . . . 2
. . . . 7 . . 5 .
. . 8 . 4 . . . 1
. . . . . 6 . 9 .
. 4 2 3 . . . . .
. 1 3 . . 5 . . .
8 . . . 1 . . . 3 | 2 8 9 6 3 4 1 7 5
6 7 4 2 5 1 9 3 8
1 3 5 9 8 7 4 6 2
4 2 1 8 7 9 3 5 6
9 6 8 5 4 3 7 2 1
3 5 7 1 2 6 8 9 4
5 4 2 3 9 8 6 1 7
7 1 3 4 6 5 2 8 9
8 9 6 7 1 2 5 4 3 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_3585_hard | 289634175674251938135987462421879356968543721357126894542398617713465289896712543 #1 Extreme (26340) bf
Forcing Net Contradiction in r3 => r7c9<>6
r7c9=6 (r7c1<>6) (r7c5<>6 r7c5=9 r7c1<>9) (r7c5<>6 r8c5=6 r8c1<>6) r7c9<>9 r8c9=9 r8c1<>9 r8c1=7 r7c1<>7 r7c1=5 r3c1<>5
r7c9=6 (r7c9<>7) r7c9<>9 r8c9=9 (r8c1<>9 r8c1=... |
sudoku_normal_hard_109 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ..8.5..1.4..13...2.1...63...4.......2..34..7...79....8.....36....4.9..235..7..1.9 | 368254917475139862912876354843567291291348576657921438729413685184695723536782149 | . . 8 . 5 . . 1 .
4 . . 1 3 . . . 2
. 1 . . . 6 3 . .
. 4 . . . . . . .
2 . . 3 4 . . 7 .
. . 7 9 . . . . 8
. . . . . 3 6 . .
. . 4 . 9 . . 2 3
5 . . 7 . . 1 . 9 | 3 6 8 2 5 4 9 1 7
4 7 5 1 3 9 8 6 2
9 1 2 8 7 6 3 5 4
8 4 3 5 6 7 2 9 1
2 9 1 3 4 8 5 7 6
6 5 7 9 2 1 4 3 8
7 2 9 4 1 3 6 8 5
1 8 4 6 9 5 7 2 3
5 3 6 7 8 2 1 4 9 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_7547_hard | 368254917475139862912876354843567291291348576657921438729413685184695723536782149 #1 Extreme (20530) bf
Brute Force: r5c4=3
Hidden Single: r2c5=3
Skyscraper: 3 in r8c9,r9c3 (connected by r4c39) => r8c12,r9c8<>3
Hidden Single: r8c9=3
Grouped AIC: 8/9 9- r2c6 =9= r1c6 =4= r9c6 -4- r9c8 -8- r89c7 =8= r2c7 -... |
sudoku_normal_extremely_hard_109 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ..8.5..1.4..1....2.1...63...4.......2...4..7...79....8.....36....4.9..2.5..7....9 | 368254917475139862912876354843567291291348576657921438729413685184695723536782149 | . . 8 . 5 . . 1 .
4 . . 1 . . . . 2
. 1 . . . 6 3 . .
. 4 . . . . . . .
2 . . . 4 . . 7 .
. . 7 9 . . . . 8
. . . . . 3 6 . .
. . 4 . 9 . . 2 .
5 . . 7 . . . . 9 | 3 6 8 2 5 4 9 1 7
4 7 5 1 3 9 8 6 2
9 1 2 8 7 6 3 5 4
8 4 3 5 6 7 2 9 1
2 9 1 3 4 8 5 7 6
6 5 7 9 2 1 4 3 8
7 2 9 4 1 3 6 8 5
1 8 4 6 9 5 7 2 3
5 3 6 7 8 2 1 4 9 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_7547_hard | 368254917475139862912876354843567291291348576657921438729413685184695723536782149 #1 Extreme (20530) bf
Brute Force: r5c4=3
Hidden Single: r2c5=3
Skyscraper: 3 in r8c9,r9c3 (connected by r4c39) => r8c12,r9c8<>3
Hidden Single: r8c9=3
Grouped AIC: 8/9 9- r2c6 =9= r1c6 =4= r9c6 -4- r9c8 -8- r89c7 =8= r2c7 -... |
sudoku_normal_hard_110 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 71.92.6.4....14..22.46.7.9..2.4....5.46172..3..7...42.67.24......27.1.464.1.692.7 | 718925634963814572254637198129483765546172983837596421675248319392751846481369257 | 7 1 . 9 2 . 6 . 4
. . . . 1 4 . . 2
2 . 4 6 . 7 . 9 .
. 2 . 4 . . . . 5
. 4 6 1 7 2 . . 3
. . 7 . . . 4 2 .
6 7 . 2 4 . . . .
. . 2 7 . 1 . 4 6
4 . 1 . 6 9 2 . 7 | 7 1 8 9 2 5 6 3 4
9 6 3 8 1 4 5 7 2
2 5 4 6 3 7 1 9 8
1 2 9 4 8 3 7 6 5
5 4 6 1 7 2 9 8 3
8 3 7 5 9 6 4 2 1
6 7 5 2 4 8 3 1 9
3 9 2 7 5 1 8 4 6
4 8 1 3 6 9 2 5 7 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_9917_hard | 718925634963814572254637198129483765546172983837596421675248319392751846481369257 #1 Extreme (21124) bf
Hidden Single: r1c5=2
Hidden Single: r6c8=2
Hidden Single: r2c6=4
Hidden Single: r1c9=4
Hidden Single: r5c2=4
Hidden Single: r8c3=2
Hidden Single: r9c5=6
Hidden Single: r7c2=7
Hidden Single... |
sudoku_normal_extremely_hard_110 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 71.9..6......1...22.46...9..2.4....5....72..3..7...4..6..2........7.1.464.1..9..7 | 718925634963814572254637198129483765546172983837596421675248319392751846481369257 | 7 1 . 9 . . 6 . .
. . . . 1 . . . 2
2 . 4 6 . . . 9 .
. 2 . 4 . . . . 5
. . . . 7 2 . . 3
. . 7 . . . 4 . .
6 . . 2 . . . . .
. . . 7 . 1 . 4 6
4 . 1 . . 9 . . 7 | 7 1 8 9 2 5 6 3 4
9 6 3 8 1 4 5 7 2
2 5 4 6 3 7 1 9 8
1 2 9 4 8 3 7 6 5
5 4 6 1 7 2 9 8 3
8 3 7 5 9 6 4 2 1
6 7 5 2 4 8 3 1 9
3 9 2 7 5 1 8 4 6
4 8 1 3 6 9 2 5 7 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_9917_hard | 718925634963814572254637198129483765546172983837596421675248319392751846481369257 #1 Extreme (21124) bf
Hidden Single: r1c5=2
Hidden Single: r6c8=2
Hidden Single: r2c6=4
Hidden Single: r1c9=4
Hidden Single: r5c2=4
Hidden Single: r8c3=2
Hidden Single: r9c5=6
Hidden Single: r7c2=7
Hidden Single... |
sudoku_normal_hard_111 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 7....9..69.5..2..441..3.....5.......3478916252....5..7.2...476...49....26.....4.. | 783549216965182374412637598856723941347891625291465837128354769534976182679218453 | 7 . . . . 9 . . 6
9 . 5 . . 2 . . 4
4 1 . . 3 . . . .
. 5 . . . . . . .
3 4 7 8 9 1 6 2 5
2 . . . . 5 . . 7
. 2 . . . 4 7 6 .
. . 4 9 . . . . 2
6 . . . . . 4 . . | 7 8 3 5 4 9 2 1 6
9 6 5 1 8 2 3 7 4
4 1 2 6 3 7 5 9 8
8 5 6 7 2 3 9 4 1
3 4 7 8 9 1 6 2 5
2 9 1 4 6 5 8 3 7
1 2 8 3 5 4 7 6 9
5 3 4 9 7 6 1 8 2
6 7 9 2 1 8 4 5 3 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4615_hard | 783549216965182374412637598856723941347891625291465837128354769534976182679218453 #1 Extreme (45378) bf
Brute Force: r5c5=9
Locked Candidates Type 2 (Claiming): 4 in r5 => r4c1,r6c2<>4
Brute Force: r5c2=4
Hidden Single: r3c1=4
Forcing Net Contradiction in r3c6 => r2c5<>6
r2c5=6 r3c6<>6
r2c5=6 (r2c4<>... |
sudoku_normal_extremely_hard_111 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 7....9..69.5..2..4.1..3.....5.........78...2.2....5..7.2...476...49....26.....4.. | 783549216965182374412637598856723941347891625291465837128354769534976182679218453 | 7 . . . . 9 . . 6
9 . 5 . . 2 . . 4
. 1 . . 3 . . . .
. 5 . . . . . . .
. . 7 8 . . . 2 .
2 . . . . 5 . . 7
. 2 . . . 4 7 6 .
. . 4 9 . . . . 2
6 . . . . . 4 . . | 7 8 3 5 4 9 2 1 6
9 6 5 1 8 2 3 7 4
4 1 2 6 3 7 5 9 8
8 5 6 7 2 3 9 4 1
3 4 7 8 9 1 6 2 5
2 9 1 4 6 5 8 3 7
1 2 8 3 5 4 7 6 9
5 3 4 9 7 6 1 8 2
6 7 9 2 1 8 4 5 3 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4615_hard | 783549216965182374412637598856723941347891625291465837128354769534976182679218453 #1 Extreme (45378) bf
Brute Force: r5c5=9
Locked Candidates Type 2 (Claiming): 4 in r5 => r4c1,r6c2<>4
Brute Force: r5c2=4
Hidden Single: r3c1=4
Forcing Net Contradiction in r3c6 => r2c5<>6
r2c5=6 r3c6<>6
r2c5=6 (r2c4<>... |
sudoku_normal_hard_112 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .2......8..4.2..9.5..1..2.....5...12.52.816..1...62.8..9.273.6.6.....92.2..6..8.7 | 721936458364825791589147236876594312952381674143762589498273165617458923235619847 | . 2 . . . . . . 8
. . 4 . 2 . . 9 .
5 . . 1 . . 2 . .
. . . 5 . . . 1 2
. 5 2 . 8 1 6 . .
1 . . . 6 2 . 8 .
. 9 . 2 7 3 . 6 .
6 . . . . . 9 2 .
2 . . 6 . . 8 . 7 | 7 2 1 9 3 6 4 5 8
3 6 4 8 2 5 7 9 1
5 8 9 1 4 7 2 3 6
8 7 6 5 9 4 3 1 2
9 5 2 3 8 1 6 7 4
1 4 3 7 6 2 5 8 9
4 9 8 2 7 3 1 6 5
6 1 7 4 5 8 9 2 3
2 3 5 6 1 9 8 4 7 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_7885_hard | 721936458364825791589147236876594312952381674143762589498273165617458923235619847 #1 Extreme (33984) bf
Brute Force: r4c9=2
Hidden Single: r8c8=2
Hidden Single: r7c4=2
Hidden Single: r2c5=2
Locked Candidates Type 1 (Pointing): 8 in b8 => r8c23<>8
Finned Swordfish: 1 r147 c378 fr7c9 => r9c8<>1
Finne... |
sudoku_normal_extremely_hard_112 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .2......8..4....9.5..1..2.....5......52.816..1...62....9..73.6.6.....9..2..6..8.7 | 721936458364825791589147236876594312952381674143762589498273165617458923235619847 | . 2 . . . . . . 8
. . 4 . . . . 9 .
5 . . 1 . . 2 . .
. . . 5 . . . . .
. 5 2 . 8 1 6 . .
1 . . . 6 2 . . .
. 9 . . 7 3 . 6 .
6 . . . . . 9 . .
2 . . 6 . . 8 . 7 | 7 2 1 9 3 6 4 5 8
3 6 4 8 2 5 7 9 1
5 8 9 1 4 7 2 3 6
8 7 6 5 9 4 3 1 2
9 5 2 3 8 1 6 7 4
1 4 3 7 6 2 5 8 9
4 9 8 2 7 3 1 6 5
6 1 7 4 5 8 9 2 3
2 3 5 6 1 9 8 4 7 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_7885_hard | 721936458364825791589147236876594312952381674143762589498273165617458923235619847 #1 Extreme (33984) bf
Brute Force: r4c9=2
Hidden Single: r8c8=2
Hidden Single: r7c4=2
Hidden Single: r2c5=2
Locked Candidates Type 1 (Pointing): 8 in b8 => r8c23<>8
Finned Swordfish: 1 r147 c378 fr7c9 => r9c8<>1
Finne... |
sudoku_normal_hard_113 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .4...63....893...4...41..5..3.6..9..8....327...2...5.32.........9..6.1..7....9.35 | 149756382658932714327418659531627948864593271972184563285371496493865127716249835 | . 4 . . . 6 3 . .
. . 8 9 3 . . . 4
. . . 4 1 . . 5 .
. 3 . 6 . . 9 . .
8 . . . . 3 2 7 .
. . 2 . . . 5 . 3
2 . . . . . . . .
. 9 . . 6 . 1 . .
7 . . . . 9 . 3 5 | 1 4 9 7 5 6 3 8 2
6 5 8 9 3 2 7 1 4
3 2 7 4 1 8 6 5 9
5 3 1 6 2 7 9 4 8
8 6 4 5 9 3 2 7 1
9 7 2 1 8 4 5 6 3
2 8 5 3 7 1 4 9 6
4 9 3 8 6 5 1 2 7
7 1 6 2 4 9 8 3 5 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_3441_hard | 149756382658932714327418659531627948864593271972184563285371496493865127716249835 #1 Extreme (24726) bf
Hidden Single: r2c5=3
Hidden Single: r6c9=3
Brute Force: r5c7=2
Hidden Single: r6c7=5
Locked Candidates Type 1 (Pointing): 4 in b6 => r78c8<>4
Locked Candidates Type 1 (Pointing): 2 in b9 => r8c46<>... |
sudoku_normal_extremely_hard_113 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .4...63....89....4...41..5..3.6..9..8....3.7...2......2.........9..6.1..7....9.35 | 149756382658932714327418659531627948864593271972184563285371496493865127716249835 | . 4 . . . 6 3 . .
. . 8 9 . . . . 4
. . . 4 1 . . 5 .
. 3 . 6 . . 9 . .
8 . . . . 3 . 7 .
. . 2 . . . . . .
2 . . . . . . . .
. 9 . . 6 . 1 . .
7 . . . . 9 . 3 5 | 1 4 9 7 5 6 3 8 2
6 5 8 9 3 2 7 1 4
3 2 7 4 1 8 6 5 9
5 3 1 6 2 7 9 4 8
8 6 4 5 9 3 2 7 1
9 7 2 1 8 4 5 6 3
2 8 5 3 7 1 4 9 6
4 9 3 8 6 5 1 2 7
7 1 6 2 4 9 8 3 5 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_3441_hard | 149756382658932714327418659531627948864593271972184563285371496493865127716249835 #1 Extreme (24726) bf
Hidden Single: r2c5=3
Hidden Single: r6c9=3
Brute Force: r5c7=2
Hidden Single: r6c7=5
Locked Candidates Type 1 (Pointing): 4 in b6 => r78c8<>4
Locked Candidates Type 1 (Pointing): 2 in b9 => r8c46<>... |
sudoku_normal_hard_114 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ..8...7..3..1...6..9......54...3..2....27.......6.43.7..534.8...49.1...36....2.4. | 168495732354127968792863415476938521583271694921654387215349876849716253637582149 | . . 8 . . . 7 . .
3 . . 1 . . . 6 .
. 9 . . . . . . 5
4 . . . 3 . . 2 .
. . . 2 7 . . . .
. . . 6 . 4 3 . 7
. . 5 3 4 . 8 . .
. 4 9 . 1 . . . 3
6 . . . . 2 . 4 . | 1 6 8 4 9 5 7 3 2
3 5 4 1 2 7 9 6 8
7 9 2 8 6 3 4 1 5
4 7 6 9 3 8 5 2 1
5 8 3 2 7 1 6 9 4
9 2 1 6 5 4 3 8 7
2 1 5 3 4 9 8 7 6
8 4 9 7 1 6 2 5 3
6 3 7 5 8 2 1 4 9 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_7097_hard | 168495732354127968792863415476938521583271694921654387215349876849716253637582149 #1 Extreme (19284) bf
Locked Candidates Type 1 (Pointing): 4 in b7 => r12c2<>4
Brute Force: r5c5=7
Finned Swordfish: 7 r249 c234 fr2c6 => r3c4<>7
Locked Candidates Type 1 (Pointing): 7 in b2 => r78c6<>7
Discontinuous Nice L... |
sudoku_normal_extremely_hard_114 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ..8...7..3..1...6..9......54...3..2....2........6.43.7..53..8....9.1....6....2.4. | 168495732354127968792863415476938521583271694921654387215349876849716253637582149 | . . 8 . . . 7 . .
3 . . 1 . . . 6 .
. 9 . . . . . . 5
4 . . . 3 . . 2 .
. . . 2 . . . . .
. . . 6 . 4 3 . 7
. . 5 3 . . 8 . .
. . 9 . 1 . . . .
6 . . . . 2 . 4 . | 1 6 8 4 9 5 7 3 2
3 5 4 1 2 7 9 6 8
7 9 2 8 6 3 4 1 5
4 7 6 9 3 8 5 2 1
5 8 3 2 7 1 6 9 4
9 2 1 6 5 4 3 8 7
2 1 5 3 4 9 8 7 6
8 4 9 7 1 6 2 5 3
6 3 7 5 8 2 1 4 9 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_7097_hard | 168495732354127968792863415476938521583271694921654387215349876849716253637582149 #1 Extreme (19284) bf
Locked Candidates Type 1 (Pointing): 4 in b7 => r12c2<>4
Brute Force: r5c5=7
Finned Swordfish: 7 r249 c234 fr2c6 => r3c4<>7
Locked Candidates Type 1 (Pointing): 7 in b2 => r78c6<>7
Discontinuous Nice L... |
sudoku_normal_hard_115 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ....82.6.26.95..1.9...1.2....6.2...141.8396...29.6..84..429..3..3..7....69.3451.. | 541782963263954817978613245386427591415839672729561384154298736832176459697345128 | . . . . 8 2 . 6 .
2 6 . 9 5 . . 1 .
9 . . . 1 . 2 . .
. . 6 . 2 . . . 1
4 1 . 8 3 9 6 . .
. 2 9 . 6 . . 8 4
. . 4 2 9 . . 3 .
. 3 . . 7 . . . .
6 9 . 3 4 5 1 . . | 5 4 1 7 8 2 9 6 3
2 6 3 9 5 4 8 1 7
9 7 8 6 1 3 2 4 5
3 8 6 4 2 7 5 9 1
4 1 5 8 3 9 6 7 2
7 2 9 5 6 1 3 8 4
1 5 4 2 9 8 7 3 6
8 3 2 1 7 6 4 5 9
6 9 7 3 4 5 1 2 8 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4242_hard | 541782963263954817978613245386427591415839672729561384154298736832176459697345128 #1 Extreme (23992) bf
Hidden Single: r7c5=9
Hidden Single: r4c9=1
Locked Candidates Type 2 (Claiming): 6 in c5 => r4c46,r6c46<>6
Hidden Pair: 6,9 in r46c3 => r46c3<>3, r46c3<>5, r46c3<>7, r4c3<>8
Brute Force: r5c4=8
Forc... |
sudoku_normal_extremely_hard_115 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .....2.6.26.95..1.9...1.2...........41...96...2.....84..42...3..3..7....69...51.. | 541782963263954817978613245386427591415839672729561384154298736832176459697345128 | . . . . . 2 . 6 .
2 6 . 9 5 . . 1 .
9 . . . 1 . 2 . .
. . . . . . . . .
4 1 . . . 9 6 . .
. 2 . . . . . 8 4
. . 4 2 . . . 3 .
. 3 . . 7 . . . .
6 9 . . . 5 1 . . | 5 4 1 7 8 2 9 6 3
2 6 3 9 5 4 8 1 7
9 7 8 6 1 3 2 4 5
3 8 6 4 2 7 5 9 1
4 1 5 8 3 9 6 7 2
7 2 9 5 6 1 3 8 4
1 5 4 2 9 8 7 3 6
8 3 2 1 7 6 4 5 9
6 9 7 3 4 5 1 2 8 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4242_hard | 541782963263954817978613245386427591415839672729561384154298736832176459697345128 #1 Extreme (23992) bf
Hidden Single: r7c5=9
Hidden Single: r4c9=1
Locked Candidates Type 2 (Claiming): 6 in c5 => r4c46,r6c46<>6
Hidden Pair: 6,9 in r46c3 => r46c3<>3, r46c3<>5, r46c3<>7, r4c3<>8
Brute Force: r5c4=8
Forc... |
sudoku_normal_hard_116 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .26.5....4..2.9..6..98467.......183...89.2..71......6.6...2...4.5...4.....43...7. | 826157943417239586539846721965471832348962157172583469681725394753694218294318675 | . 2 6 . 5 . . . .
4 . . 2 . 9 . . 6
. . 9 8 4 6 7 . .
. . . . . 1 8 3 .
. . 8 9 . 2 . . 7
1 . . . . . . 6 .
6 . . . 2 . . . 4
. 5 . . . 4 . . .
. . 4 3 . . . 7 . | 8 2 6 1 5 7 9 4 3
4 1 7 2 3 9 5 8 6
5 3 9 8 4 6 7 2 1
9 6 5 4 7 1 8 3 2
3 4 8 9 6 2 1 5 7
1 7 2 5 8 3 4 6 9
6 8 1 7 2 5 3 9 4
7 5 3 6 9 4 2 1 8
2 9 4 3 1 8 6 7 5 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_7692_hard | 826157943417239586539846721965471832348962157172583469681725394753694218294318675 #1 Extreme (19906) bf
Brute Force: r5c6=2
Hidden Single: r2c4=2
Naked Pair: 3,5 in r35c1 => r18c1<>3, r4c1<>5
Grouped Discontinuous Nice Loop: 4 r5c5 -4- r3c5 =4= r3c8 =2= r3c9 -2- r46c9 =2= r6c7 =4= r5c78 -4- r5c5 => r5c5<>4
... |
sudoku_normal_extremely_hard_116 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .2..5....4....9..6..98..7.......183...89....71......6.6...2...4.5...4.....43...7. | 826157943417239586539846721965471832348962157172583469681725394753694218294318675 | . 2 . . 5 . . . .
4 . . . . 9 . . 6
. . 9 8 . . 7 . .
. . . . . 1 8 3 .
. . 8 9 . . . . 7
1 . . . . . . 6 .
6 . . . 2 . . . 4
. 5 . . . 4 . . .
. . 4 3 . . . 7 . | 8 2 6 1 5 7 9 4 3
4 1 7 2 3 9 5 8 6
5 3 9 8 4 6 7 2 1
9 6 5 4 7 1 8 3 2
3 4 8 9 6 2 1 5 7
1 7 2 5 8 3 4 6 9
6 8 1 7 2 5 3 9 4
7 5 3 6 9 4 2 1 8
2 9 4 3 1 8 6 7 5 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_7692_hard | 826157943417239586539846721965471832348962157172583469681725394753694218294318675 #1 Extreme (19906) bf
Brute Force: r5c6=2
Hidden Single: r2c4=2
Naked Pair: 3,5 in r35c1 => r18c1<>3, r4c1<>5
Grouped Discontinuous Nice Loop: 4 r5c5 -4- r3c5 =4= r3c8 =2= r3c9 -2- r46c9 =2= r6c7 =4= r5c78 -4- r5c5 => r5c5<>4
... |
sudoku_normal_hard_117 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 3...7.52.......867..75..31...143.9.2.....9.46.9.....53..2.1.6.5.4.6....86....8... | 386971524915243867427586319561437982238159746794862153872314695143695278659728431 | 3 . . . 7 . 5 2 .
. . . . . . 8 6 7
. . 7 5 . . 3 1 .
. . 1 4 3 . 9 . 2
. . . . . 9 . 4 6
. 9 . . . . . 5 3
. . 2 . 1 . 6 . 5
. 4 . 6 . . . . 8
6 . . . . 8 . . . | 3 8 6 9 7 1 5 2 4
9 1 5 2 4 3 8 6 7
4 2 7 5 8 6 3 1 9
5 6 1 4 3 7 9 8 2
2 3 8 1 5 9 7 4 6
7 9 4 8 6 2 1 5 3
8 7 2 3 1 4 6 9 5
1 4 3 6 9 5 2 7 8
6 5 9 7 2 8 4 3 1 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_8206_hard | 386971524915243867427586319561437982238159746794862153872314695143695278659728431 #1 Extreme (15290) bf
Locked Candidates Type 1 (Pointing): 3 in b6 => r89c9<>3
Brute Force: r5c9=6
Hidden Single: r6c9=3
Locked Candidates Type 1 (Pointing): 6 in b3 => r2c2356<>6
Locked Candidates Type 1 (Pointing): 1 in b... |
sudoku_normal_extremely_hard_117 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 3...7.52.........7..75..31...143.9.2.....9.4..9.....5...2.1...5.4.6.....6....8... | 386971524915243867427586319561437982238159746794862153872314695143695278659728431 | 3 . . . 7 . 5 2 .
. . . . . . . . 7
. . 7 5 . . 3 1 .
. . 1 4 3 . 9 . 2
. . . . . 9 . 4 .
. 9 . . . . . 5 .
. . 2 . 1 . . . 5
. 4 . 6 . . . . .
6 . . . . 8 . . . | 3 8 6 9 7 1 5 2 4
9 1 5 2 4 3 8 6 7
4 2 7 5 8 6 3 1 9
5 6 1 4 3 7 9 8 2
2 3 8 1 5 9 7 4 6
7 9 4 8 6 2 1 5 3
8 7 2 3 1 4 6 9 5
1 4 3 6 9 5 2 7 8
6 5 9 7 2 8 4 3 1 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_8206_hard | 386971524915243867427586319561437982238159746794862153872314695143695278659728431 #1 Extreme (15290) bf
Locked Candidates Type 1 (Pointing): 3 in b6 => r89c9<>3
Brute Force: r5c9=6
Hidden Single: r6c9=3
Locked Candidates Type 1 (Pointing): 6 in b3 => r2c2356<>6
Locked Candidates Type 1 (Pointing): 1 in b... |
sudoku_normal_hard_118 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .6582.....2.1..65...9.65...25.9.1.6..81.562399.628...5..86.....6.25..3.4.1......6 | 165827943824139657739465182253941768481756239976283415348672591692518374517394826 | . 6 5 8 2 . . . .
. 2 . 1 . . 6 5 .
. . 9 . 6 5 . . .
2 5 . 9 . 1 . 6 .
. 8 1 . 5 6 2 3 9
9 . 6 2 8 . . . 5
. . 8 6 . . . . .
6 . 2 5 . . 3 . 4
. 1 . . . . . . 6 | 1 6 5 8 2 7 9 4 3
8 2 4 1 3 9 6 5 7
7 3 9 4 6 5 1 8 2
2 5 3 9 4 1 7 6 8
4 8 1 7 5 6 2 3 9
9 7 6 2 8 3 4 1 5
3 4 8 6 7 2 5 9 1
6 9 2 5 1 8 3 7 4
5 1 7 3 9 4 8 2 6 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_7201_hard | 165827943824139657739465182253941768481756239976283415348672591692518374517394826 #1 Extreme (27050) bf
Hidden Single: r2c8=5
Hidden Single: r3c5=6
Hidden Single: r1c2=6
Hidden Single: r4c1=2
Hidden Single: r5c3=1
Hidden Single: r4c8=6
Hidden Single: r4c2=5
Hidden Single: r8c4=5
Brute Force: ... |
sudoku_normal_extremely_hard_118 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ..582.....2.1..6....9..5......9.1....8..562..9.628...5..86.....6.2...3.4.1......6 | 165827943824139657739465182253941768481756239976283415348672591692518374517394826 | . . 5 8 2 . . . .
. 2 . 1 . . 6 . .
. . 9 . . 5 . . .
. . . 9 . 1 . . .
. 8 . . 5 6 2 . .
9 . 6 2 8 . . . 5
. . 8 6 . . . . .
6 . 2 . . . 3 . 4
. 1 . . . . . . 6 | 1 6 5 8 2 7 9 4 3
8 2 4 1 3 9 6 5 7
7 3 9 4 6 5 1 8 2
2 5 3 9 4 1 7 6 8
4 8 1 7 5 6 2 3 9
9 7 6 2 8 3 4 1 5
3 4 8 6 7 2 5 9 1
6 9 2 5 1 8 3 7 4
5 1 7 3 9 4 8 2 6 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_7201_hard | 165827943824139657739465182253941768481756239976283415348672591692518374517394826 #1 Extreme (27050) bf
Hidden Single: r2c8=5
Hidden Single: r3c5=6
Hidden Single: r1c2=6
Hidden Single: r4c1=2
Hidden Single: r5c3=1
Hidden Single: r4c8=6
Hidden Single: r4c2=5
Hidden Single: r8c4=5
Brute Force: ... |
sudoku_normal_hard_119 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .5..4..7...7..94..8.47.52....61.4....4.976.3..7..5264.7...2.3.4.2.4.....4..5.7.2. | 652843179317269485894715263236184597145976832978352641789621354523498716461537928 | . 5 . . 4 . . 7 .
. . 7 . . 9 4 . .
8 . 4 7 . 5 2 . .
. . 6 1 . 4 . . .
. 4 . 9 7 6 . 3 .
. 7 . . 5 2 6 4 .
7 . . . 2 . 3 . 4
. 2 . 4 . . . . .
4 . . 5 . 7 . 2 . | 6 5 2 8 4 3 1 7 9
3 1 7 2 6 9 4 8 5
8 9 4 7 1 5 2 6 3
2 3 6 1 8 4 5 9 7
1 4 5 9 7 6 8 3 2
9 7 8 3 5 2 6 4 1
7 8 9 6 2 1 3 5 4
5 2 3 4 9 8 7 1 6
4 6 1 5 3 7 9 2 8 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4880_hard | 652843179317269485894715263236184597145976832978352641789621354523498716461537928 #1 Extreme (20230) bf
Hidden Single: r6c8=4
Hidden Single: r4c6=4
Hidden Single: r3c6=5
Hidden Single: r3c4=7
Hidden Single: r7c1=7
Hidden Single: r3c3=4
Hidden Single: r2c7=4
Hidden Single: r9c1=4
Almost Locked... |
sudoku_normal_extremely_hard_119 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .5..4..7...7..9...8.....2....61......4..7..3..7..526......2.3.4.2.4........5.7.2. | 652843179317269485894715263236184597145976832978352641789621354523498716461537928 | . 5 . . 4 . . 7 .
. . 7 . . 9 . . .
8 . . . . . 2 . .
. . 6 1 . . . . .
. 4 . . 7 . . 3 .
. 7 . . 5 2 6 . .
. . . . 2 . 3 . 4
. 2 . 4 . . . . .
. . . 5 . 7 . 2 . | 6 5 2 8 4 3 1 7 9
3 1 7 2 6 9 4 8 5
8 9 4 7 1 5 2 6 3
2 3 6 1 8 4 5 9 7
1 4 5 9 7 6 8 3 2
9 7 8 3 5 2 6 4 1
7 8 9 6 2 1 3 5 4
5 2 3 4 9 8 7 1 6
4 6 1 5 3 7 9 2 8 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4880_hard | 652843179317269485894715263236184597145976832978352641789621354523498716461537928 #1 Extreme (20230) bf
Hidden Single: r6c8=4
Hidden Single: r4c6=4
Hidden Single: r3c6=5
Hidden Single: r3c4=7
Hidden Single: r7c1=7
Hidden Single: r3c3=4
Hidden Single: r2c7=4
Hidden Single: r9c1=4
Almost Locked... |
sudoku_normal_hard_120 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .....2..95...3.....1.7..3...6.41..7...4..89.....6..4..9......5...8.....2.7..6.1.. | 743182569586934217219756384362419875154378926897625431921847653638591742475263198 | . . . . . 2 . . 9
5 . . . 3 . . . .
. 1 . 7 . . 3 . .
. 6 . 4 1 . . 7 .
. . 4 . . 8 9 . .
. . . 6 . . 4 . .
9 . . . . . . 5 .
. . 8 . . . . . 2
. 7 . . 6 . 1 . . | 7 4 3 1 8 2 5 6 9
5 8 6 9 3 4 2 1 7
2 1 9 7 5 6 3 8 4
3 6 2 4 1 9 8 7 5
1 5 4 3 7 8 9 2 6
8 9 7 6 2 5 4 3 1
9 2 1 8 4 7 6 5 3
6 3 8 5 9 1 7 4 2
4 7 5 2 6 3 1 9 8 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_3736_hard | 743182569586934217219756384362419875154378926897625431921847653638591742475263198 #1 Extreme (29284) bf
Hidden Pair: 1,6 in r7c3,r8c1 => r7c3<>2, r7c3,r8c1<>3, r8c1<>4
Forcing Net Contradiction in r8 => r6c8<>1
r6c8=1 (r5c8<>1) r5c9<>1 r5c1=1 r5c1<>7 r5c5=7 r8c5<>7
r6c8=1 (r1c8<>1 r1c4=1 r8c4<>1) (r5c8<>1) r5... |
sudoku_normal_extremely_hard_120 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .....2..95...3.....1.7..3...6.41..7...4..8......6..4..9......5...8.....2.7..6.1.. | 743182569586934217219756384362419875154378926897625431921847653638591742475263198 | . . . . . 2 . . 9
5 . . . 3 . . . .
. 1 . 7 . . 3 . .
. 6 . 4 1 . . 7 .
. . 4 . . 8 . . .
. . . 6 . . 4 . .
9 . . . . . . 5 .
. . 8 . . . . . 2
. 7 . . 6 . 1 . . | 7 4 3 1 8 2 5 6 9
5 8 6 9 3 4 2 1 7
2 1 9 7 5 6 3 8 4
3 6 2 4 1 9 8 7 5
1 5 4 3 7 8 9 2 6
8 9 7 6 2 5 4 3 1
9 2 1 8 4 7 6 5 3
6 3 8 5 9 1 7 4 2
4 7 5 2 6 3 1 9 8 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_3736_hard | 743182569586934217219756384362419875154378926897625431921847653638591742475263198 #1 Extreme (29284) bf
Hidden Pair: 1,6 in r7c3,r8c1 => r7c3<>2, r7c3,r8c1<>3, r8c1<>4
Forcing Net Contradiction in r8 => r6c8<>1
r6c8=1 (r5c8<>1) r5c9<>1 r5c1=1 r5c1<>7 r5c5=7 r8c5<>7
r6c8=1 (r1c8<>1 r1c4=1 r8c4<>1) (r5c8<>1) r5... |
sudoku_normal_hard_121 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .5....67...9.....28....1.4.7....8...4..3.521...2.9........5...6.....7.3....8.34.. | 253489671149736852867521943731268594496375218582194367314952786928647135675813429 | . 5 . . . . 6 7 .
. . 9 . . . . . 2
8 . . . . 1 . 4 .
7 . . . . 8 . . .
4 . . 3 . 5 2 1 .
. . 2 . 9 . . . .
. . . . 5 . . . 6
. . . . . 7 . 3 .
. . . 8 . 3 4 . . | 2 5 3 4 8 9 6 7 1
1 4 9 7 3 6 8 5 2
8 6 7 5 2 1 9 4 3
7 3 1 2 6 8 5 9 4
4 9 6 3 7 5 2 1 8
5 8 2 1 9 4 3 6 7
3 1 4 9 5 2 7 8 6
9 2 8 6 4 7 1 3 5
6 7 5 8 1 3 4 2 9 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_5121_hard | 253489671149736852867521943731268594496375218582194367314952786928647135675813429 #1 Extreme (39944) bf
Locked Candidates Type 1 (Pointing): 9 in b4 => r789c2<>9
Almost Locked Set XY-Wing: A=r1c13469 {123489}, B=r34589c5 {123467}, C=r2c8,r3c79 {3589}, X,Y=3,8, Z=2,4 => r1c5<>2, r1c5<>4
Brute Force: r5c6=5
N... |
sudoku_normal_extremely_hard_121 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .5....67...9.....28....1.4.7....8...4..3...1...2.9........5...6.....7.3....8.34.. | 253489671149736852867521943731268594496375218582194367314952786928647135675813429 | . 5 . . . . 6 7 .
. . 9 . . . . . 2
8 . . . . 1 . 4 .
7 . . . . 8 . . .
4 . . 3 . . . 1 .
. . 2 . 9 . . . .
. . . . 5 . . . 6
. . . . . 7 . 3 .
. . . 8 . 3 4 . . | 2 5 3 4 8 9 6 7 1
1 4 9 7 3 6 8 5 2
8 6 7 5 2 1 9 4 3
7 3 1 2 6 8 5 9 4
4 9 6 3 7 5 2 1 8
5 8 2 1 9 4 3 6 7
3 1 4 9 5 2 7 8 6
9 2 8 6 4 7 1 3 5
6 7 5 8 1 3 4 2 9 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_5121_hard | 253489671149736852867521943731268594496375218582194367314952786928647135675813429 #1 Extreme (39944) bf
Locked Candidates Type 1 (Pointing): 9 in b4 => r789c2<>9
Almost Locked Set XY-Wing: A=r1c13469 {123489}, B=r34589c5 {123467}, C=r2c8,r3c79 {3589}, X,Y=3,8, Z=2,4 => r1c5<>2, r1c5<>4
Brute Force: r5c6=5
N... |
sudoku_normal_hard_122 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .....54....98....3.4..3.86....5..798.92687....7..9...61....8.3.93..1.6..2.43....1 | 783265419629841573541739862416523798392687145875194326167958234938412657254376981 | . . . . . 5 4 . .
. . 9 8 . . . . 3
. 4 . . 3 . 8 6 .
. . . 5 . . 7 9 8
. 9 2 6 8 7 . . .
. 7 . . 9 . . . 6
1 . . . . 8 . 3 .
9 3 . . 1 . 6 . .
2 . 4 3 . . . . 1 | 7 8 3 2 6 5 4 1 9
6 2 9 8 4 1 5 7 3
5 4 1 7 3 9 8 6 2
4 1 6 5 2 3 7 9 8
3 9 2 6 8 7 1 4 5
8 7 5 1 9 4 3 2 6
1 6 7 9 5 8 2 3 4
9 3 8 4 1 2 6 5 7
2 5 4 3 7 6 9 8 1 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_5280_hard | 783265419629841573541739862416523798392687145875194326167958234938412657254376981 #1 Extreme (25748) bf
Brute Force: r5c5=8
Hidden Single: r5c6=7
Forcing Net Contradiction in c8 => r4c9<>4
r4c9=4 (r6c8<>4 r8c8=4 r8c8<>5) (r5c8<>4) r5c9<>4 (r5c9=5 r5c2<>5) (r5c9=5 r8c9<>5) r5c1=4 r5c1<>9 r8c1=9 r8c1<>5 r8c3=5... |
sudoku_normal_extremely_hard_122 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .....54....98....3.4..3..6....5..79...26......7..9...61....8.3..3..1.6..2.43....1 | 783265419629841573541739862416523798392687145875194326167958234938412657254376981 | . . . . . 5 4 . .
. . 9 8 . . . . 3
. 4 . . 3 . . 6 .
. . . 5 . . 7 9 .
. . 2 6 . . . . .
. 7 . . 9 . . . 6
1 . . . . 8 . 3 .
. 3 . . 1 . 6 . .
2 . 4 3 . . . . 1 | 7 8 3 2 6 5 4 1 9
6 2 9 8 4 1 5 7 3
5 4 1 7 3 9 8 6 2
4 1 6 5 2 3 7 9 8
3 9 2 6 8 7 1 4 5
8 7 5 1 9 4 3 2 6
1 6 7 9 5 8 2 3 4
9 3 8 4 1 2 6 5 7
2 5 4 3 7 6 9 8 1 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_5280_hard | 783265419629841573541739862416523798392687145875194326167958234938412657254376981 #1 Extreme (25748) bf
Brute Force: r5c5=8
Hidden Single: r5c6=7
Forcing Net Contradiction in c8 => r4c9<>4
r4c9=4 (r6c8<>4 r8c8=4 r8c8<>5) (r5c8<>4) r5c9<>4 (r5c9=5 r5c2<>5) (r5c9=5 r8c9<>5) r5c1=4 r5c1<>9 r8c1=9 r8c1<>5 r8c3=5... |
sudoku_normal_hard_123 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ..1.3.8..9....2.6..2......427..5..3...467...8...2..7...1..69.....7..56..6..3.7.5. | 561734829948512367723986514279458136154673298836291745315869472497125683682347951 | . . 1 . 3 . 8 . .
9 . . . . 2 . 6 .
. 2 . . . . . . 4
2 7 . . 5 . . 3 .
. . 4 6 7 . . . 8
. . . 2 . . 7 . .
. 1 . . 6 9 . . .
. . 7 . . 5 6 . .
6 . . 3 . 7 . 5 . | 5 6 1 7 3 4 8 2 9
9 4 8 5 1 2 3 6 7
7 2 3 9 8 6 5 1 4
2 7 9 4 5 8 1 3 6
1 5 4 6 7 3 2 9 8
8 3 6 2 9 1 7 4 5
3 1 5 8 6 9 4 7 2
4 9 7 1 2 5 6 8 3
6 8 2 3 4 7 9 5 1 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_3989_hard | 561734829948512367723986514279458136154673298836291745315869472497125683682347951 #1 Extreme (16140) bf
Discontinuous Nice Loop: 5 r1c9 -5- r6c9 =5= r5c7 =2= r5c8 -2- r1c8 =2= r1c9 => r1c9<>5
Brute Force: r5c5=7
Hidden Single: r4c2=7
Skyscraper: 7 in r2c4,r9c6 (connected by r29c9) => r13c6,r7c4<>7
Hidden... |
sudoku_normal_extremely_hard_123 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ..1.3.8..9....2.6..2......42...5..3...4.....8...2..7...1..69.....7..56..6..3...5. | 561734829948512367723986514279458136154673298836291745315869472497125683682347951 | . . 1 . 3 . 8 . .
9 . . . . 2 . 6 .
. 2 . . . . . . 4
2 . . . 5 . . 3 .
. . 4 . . . . . 8
. . . 2 . . 7 . .
. 1 . . 6 9 . . .
. . 7 . . 5 6 . .
6 . . 3 . . . 5 . | 5 6 1 7 3 4 8 2 9
9 4 8 5 1 2 3 6 7
7 2 3 9 8 6 5 1 4
2 7 9 4 5 8 1 3 6
1 5 4 6 7 3 2 9 8
8 3 6 2 9 1 7 4 5
3 1 5 8 6 9 4 7 2
4 9 7 1 2 5 6 8 3
6 8 2 3 4 7 9 5 1 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_3989_hard | 561734829948512367723986514279458136154673298836291745315869472497125683682347951 #1 Extreme (16140) bf
Discontinuous Nice Loop: 5 r1c9 -5- r6c9 =5= r5c7 =2= r5c8 -2- r1c8 =2= r1c9 => r1c9<>5
Brute Force: r5c5=7
Hidden Single: r4c2=7
Skyscraper: 7 in r2c4,r9c6 (connected by r29c9) => r13c6,r7c4<>7
Hidden... |
sudoku_normal_hard_124 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 5.6.....7.9.5..3..3....2.......2..7..65..12.8..96..4.1.4.2...1.6..9.45...5..8.7.4 | 516349827298517346374862195183425679465791238729638451847256913631974582952183764 | 5 . 6 . . . . . 7
. 9 . 5 . . 3 . .
3 . . . . 2 . . .
. . . . 2 . . 7 .
. 6 5 . . 1 2 . 8
. . 9 6 . . 4 . 1
. 4 . 2 . . . 1 .
6 . . 9 . 4 5 . .
. 5 . . 8 . 7 . 4 | 5 1 6 3 4 9 8 2 7
2 9 8 5 1 7 3 4 6
3 7 4 8 6 2 1 9 5
1 8 3 4 2 5 6 7 9
4 6 5 7 9 1 2 3 8
7 2 9 6 3 8 4 5 1
8 4 7 2 5 6 9 1 3
6 3 1 9 7 4 5 8 2
9 5 2 1 8 3 7 6 4 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_8294_hard | 516349827298517346374862195183425679465791238729638451847256913631974582952183764 #1 Extreme (26842) bf
Brute Force: r5c3=5
Hidden Single: r9c2=5
Forcing Net Contradiction in r5c1 => r5c5<>7
r5c5=7 (r5c5<>9 r4c6=9 r4c6<>5 r4c9=5 r6c8<>5) (r6c5<>7) (r6c6<>7) r5c4<>7 r3c4=7 r2c6<>7 r7c6=7 r7c6<>5 r7c5=5 r6c5<>... |
sudoku_normal_extremely_hard_124 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 5.6.....7.9.5..3..3....2.......2..7......1..8..96..4...4.2...1.6..9.45......8.7.4 | 516349827298517346374862195183425679465791238729638451847256913631974582952183764 | 5 . 6 . . . . . 7
. 9 . 5 . . 3 . .
3 . . . . 2 . . .
. . . . 2 . . 7 .
. . . . . 1 . . 8
. . 9 6 . . 4 . .
. 4 . 2 . . . 1 .
6 . . 9 . 4 5 . .
. . . . 8 . 7 . 4 | 5 1 6 3 4 9 8 2 7
2 9 8 5 1 7 3 4 6
3 7 4 8 6 2 1 9 5
1 8 3 4 2 5 6 7 9
4 6 5 7 9 1 2 3 8
7 2 9 6 3 8 4 5 1
8 4 7 2 5 6 9 1 3
6 3 1 9 7 4 5 8 2
9 5 2 1 8 3 7 6 4 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_8294_hard | 516349827298517346374862195183425679465791238729638451847256913631974582952183764 #1 Extreme (26842) bf
Brute Force: r5c3=5
Hidden Single: r9c2=5
Forcing Net Contradiction in r5c1 => r5c5<>7
r5c5=7 (r5c5<>9 r4c6=9 r4c6<>5 r4c9=5 r6c8<>5) (r6c5<>7) (r6c6<>7) r5c4<>7 r3c4=7 r2c6<>7 r7c6=7 r7c6<>5 r7c5=5 r6c5<>... |
sudoku_normal_hard_125 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 8...23....3...6.9...25..3..3.7.6.5..1...359766..7...43.8.6...394..3...1...3..76.. | 816923457534876192972541368397468521148235976625719843781654239469382715253197684 | 8 . . . 2 3 . . .
. 3 . . . 6 . 9 .
. . 2 5 . . 3 . .
3 . 7 . 6 . 5 . .
1 . . . 3 5 9 7 6
6 . . 7 . . . 4 3
. 8 . 6 . . . 3 9
4 . . 3 . . . 1 .
. . 3 . . 7 6 . . | 8 1 6 9 2 3 4 5 7
5 3 4 8 7 6 1 9 2
9 7 2 5 4 1 3 6 8
3 9 7 4 6 8 5 2 1
1 4 8 2 3 5 9 7 6
6 2 5 7 1 9 8 4 3
7 8 1 6 5 4 2 3 9
4 6 9 3 8 2 7 1 5
2 5 3 1 9 7 6 8 4 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_7441_hard | 816923457534876192972541368397468521148235976625719843781654239469382715253197684 #1 Extreme (42092) bf
Brute Force: r5c7=9
Hidden Single: r5c8=7
Locked Candidates Type 2 (Claiming): 3 in r5 => r4c4,r6c5<>3
Forcing Net Contradiction in c4 => r9c9<>2
r9c9=2 (r9c1<>2) (r9c8<>2 r4c8=2 r4c2<>2) (r9c2<>2) (r9c... |
sudoku_normal_extremely_hard_125 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 8...23....3...6.9...25..3....7.6.5..1....5..6...7...4..8......94......1...3..76.. | 816923457534876192972541368397468521148235976625719843781654239469382715253197684 | 8 . . . 2 3 . . .
. 3 . . . 6 . 9 .
. . 2 5 . . 3 . .
. . 7 . 6 . 5 . .
1 . . . . 5 . . 6
. . . 7 . . . 4 .
. 8 . . . . . . 9
4 . . . . . . 1 .
. . 3 . . 7 6 . . | 8 1 6 9 2 3 4 5 7
5 3 4 8 7 6 1 9 2
9 7 2 5 4 1 3 6 8
3 9 7 4 6 8 5 2 1
1 4 8 2 3 5 9 7 6
6 2 5 7 1 9 8 4 3
7 8 1 6 5 4 2 3 9
4 6 9 3 8 2 7 1 5
2 5 3 1 9 7 6 8 4 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_7441_hard | 816923457534876192972541368397468521148235976625719843781654239469382715253197684 #1 Extreme (42092) bf
Brute Force: r5c7=9
Hidden Single: r5c8=7
Locked Candidates Type 2 (Claiming): 3 in r5 => r4c4,r6c5<>3
Forcing Net Contradiction in c4 => r9c9<>2
r9c9=2 (r9c1<>2) (r9c8<>2 r4c8=2 r4c2<>2) (r9c2<>2) (r9c... |
sudoku_normal_hard_126 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ..6..9.2..4.36.5..1..........8..5..23...468...6.1.87..6......89..5..72......8.... | 586479123249361578173852946718935462352746891964128735627514389835697214491283657 | . . 6 . . 9 . 2 .
. 4 . 3 6 . 5 . .
1 . . . . . . . .
. . 8 . . 5 . . 2
3 . . . 4 6 8 . .
. 6 . 1 . 8 7 . .
6 . . . . . . 8 9
. . 5 . . 7 2 . .
. . . . 8 . . . . | 5 8 6 4 7 9 1 2 3
2 4 9 3 6 1 5 7 8
1 7 3 8 5 2 9 4 6
7 1 8 9 3 5 4 6 2
3 5 2 7 4 6 8 9 1
9 6 4 1 2 8 7 3 5
6 2 7 5 1 4 3 8 9
8 3 5 6 9 7 2 1 4
4 9 1 2 8 3 6 5 7 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4223_hard | 586479123249361578173852946718935462352746891964128735627514389835697214491283657 #1 Extreme (31346) bf
Locked Candidates Type 1 (Pointing): 5 in b9 => r9c4<>5
Locked Candidates Type 1 (Pointing): 7 in b9 => r9c123<>7
Hidden Pair: 5,7 in r9c89 => r9c89<>1, r9c89<>3, r9c89<>4, r9c89<>6
Brute Force: r5c7=8
... |
sudoku_normal_extremely_hard_126 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ..6..9.2..4.36.5..1..........8..5..23...4.....6.1..7..6......89..5..72......8.... | 586479123249361578173852946718935462352746891964128735627514389835697214491283657 | . . 6 . . 9 . 2 .
. 4 . 3 6 . 5 . .
1 . . . . . . . .
. . 8 . . 5 . . 2
3 . . . 4 . . . .
. 6 . 1 . . 7 . .
6 . . . . . . 8 9
. . 5 . . 7 2 . .
. . . . 8 . . . . | 5 8 6 4 7 9 1 2 3
2 4 9 3 6 1 5 7 8
1 7 3 8 5 2 9 4 6
7 1 8 9 3 5 4 6 2
3 5 2 7 4 6 8 9 1
9 6 4 1 2 8 7 3 5
6 2 7 5 1 4 3 8 9
8 3 5 6 9 7 2 1 4
4 9 1 2 8 3 6 5 7 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4223_hard | 586479123249361578173852946718935462352746891964128735627514389835697214491283657 #1 Extreme (31346) bf
Locked Candidates Type 1 (Pointing): 5 in b9 => r9c4<>5
Locked Candidates Type 1 (Pointing): 7 in b9 => r9c123<>7
Hidden Pair: 5,7 in r9c89 => r9c89<>1, r9c89<>3, r9c89<>4, r9c89<>6
Brute Force: r5c7=8
... |
sudoku_normal_hard_127 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 9.....4.7.7.42.89.4.8..7....4..691.2..6.7.349...1..76.....3.51.5.........2...8..4 | 912586437675423891438917625847369152156872349293145768789234516564791283321658974 | 9 . . . . . 4 . 7
. 7 . 4 2 . 8 9 .
4 . 8 . . 7 . . .
. 4 . . 6 9 1 . 2
. . 6 . 7 . 3 4 9
. . . 1 . . 7 6 .
. . . . 3 . 5 1 .
5 . . . . . . . .
. 2 . . . 8 . . 4 | 9 1 2 5 8 6 4 3 7
6 7 5 4 2 3 8 9 1
4 3 8 9 1 7 6 2 5
8 4 7 3 6 9 1 5 2
1 5 6 8 7 2 3 4 9
2 9 3 1 4 5 7 6 8
7 8 9 2 3 4 5 1 6
5 6 4 7 9 1 2 8 3
3 2 1 6 5 8 9 7 4 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_8577_hard | 912586437675423891438917625847369152156872349293145768789234516564791283321658974 #1 Extreme (28602) bf
Locked Candidates Type 1 (Pointing): 9 in b2 => r3c789<>9
Locked Candidates Type 1 (Pointing): 2 in b9 => r8c46<>2
Hidden Pair: 2,4 in r1c3,r3c1 => r1c3,r3c1<>1, r1c3,r3c1<>3, r1c3<>5, r3c1<>6
Brute Force... |
sudoku_normal_extremely_hard_127 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 9.......7.7.42.8....8..7....4..69..2..6.7.3.....1...6.....3.51.5.........2...8..4 | 912586437675423891438917625847369152156872349293145768789234516564791283321658974 | 9 . . . . . . . 7
. 7 . 4 2 . 8 . .
. . 8 . . 7 . . .
. 4 . . 6 9 . . 2
. . 6 . 7 . 3 . .
. . . 1 . . . 6 .
. . . . 3 . 5 1 .
5 . . . . . . . .
. 2 . . . 8 . . 4 | 9 1 2 5 8 6 4 3 7
6 7 5 4 2 3 8 9 1
4 3 8 9 1 7 6 2 5
8 4 7 3 6 9 1 5 2
1 5 6 8 7 2 3 4 9
2 9 3 1 4 5 7 6 8
7 8 9 2 3 4 5 1 6
5 6 4 7 9 1 2 8 3
3 2 1 6 5 8 9 7 4 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_8577_hard | 912586437675423891438917625847369152156872349293145768789234516564791283321658974 #1 Extreme (28602) bf
Locked Candidates Type 1 (Pointing): 9 in b2 => r3c789<>9
Locked Candidates Type 1 (Pointing): 2 in b9 => r8c46<>2
Hidden Pair: 2,4 in r1c3,r3c1 => r1c3,r3c1<>1, r1c3,r3c1<>3, r1c3<>5, r3c1<>6
Brute Force... |
sudoku_normal_hard_128 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .7.9..6.2..3.6579.9.6.27.8...7.9.8166..7..923.9...6547.6..7.2.97....9.6.4.96...7. | 874913652213865794956427381347592816685741923192386547568174239731259468429638175 | . 7 . 9 . . 6 . 2
. . 3 . 6 5 7 9 .
9 . 6 . 2 7 . 8 .
. . 7 . 9 . 8 1 6
6 . . 7 . . 9 2 3
. 9 . . . 6 5 4 7
. 6 . . 7 . 2 . 9
7 . . . . 9 . 6 .
4 . 9 6 . . . 7 . | 8 7 4 9 1 3 6 5 2
2 1 3 8 6 5 7 9 4
9 5 6 4 2 7 3 8 1
3 4 7 5 9 2 8 1 6
6 8 5 7 4 1 9 2 3
1 9 2 3 8 6 5 4 7
5 6 8 1 7 4 2 3 9
7 3 1 2 5 9 4 6 8
4 2 9 6 3 8 1 7 5 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4702_hard | 874913652213865794956427381347592816685741923192386547568174239731259468429638175 #1 Extreme (36012) bf
Hidden Single: r3c6=7
Hidden Single: r9c3=9
Hidden Single: r4c9=6
Hidden Single: r8c1=7
Hidden Single: r2c5=6
Hidden Single: r7c2=6
Hidden Single: r6c6=6
Finned Swordfish: 2 r249 c126 fr4c4 =>... |
sudoku_normal_extremely_hard_128 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .7.9..6.2..3..5.....6.2..8...7.9..1.6..7......9....5.7....7.2.9.....9.6.4..6..... | 874913652213865794956427381347592816685741923192386547568174239731259468429638175 | . 7 . 9 . . 6 . 2
. . 3 . . 5 . . .
. . 6 . 2 . . 8 .
. . 7 . 9 . . 1 .
6 . . 7 . . . . .
. 9 . . . . 5 . 7
. . . . 7 . 2 . 9
. . . . . 9 . 6 .
4 . . 6 . . . . . | 8 7 4 9 1 3 6 5 2
2 1 3 8 6 5 7 9 4
9 5 6 4 2 7 3 8 1
3 4 7 5 9 2 8 1 6
6 8 5 7 4 1 9 2 3
1 9 2 3 8 6 5 4 7
5 6 8 1 7 4 2 3 9
7 3 1 2 5 9 4 6 8
4 2 9 6 3 8 1 7 5 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4702_hard | 874913652213865794956427381347592816685741923192386547568174239731259468429638175 #1 Extreme (36012) bf
Hidden Single: r3c6=7
Hidden Single: r9c3=9
Hidden Single: r4c9=6
Hidden Single: r8c1=7
Hidden Single: r2c5=6
Hidden Single: r7c2=6
Hidden Single: r6c6=6
Finned Swordfish: 2 r249 c126 fr4c4 =>... |
sudoku_normal_hard_129 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ..5..23..21..7...59..5...2...2.1568.16.7..5.2.59.26.7.52...7..6..7.5..4..9.....5. | 745192368216873495938564721372415689164789532859326174523947816687251943491638257 | . . 5 . . 2 3 . .
2 1 . . 7 . . . 5
9 . . 5 . . . 2 .
. . 2 . 1 5 6 8 .
1 6 . 7 . . 5 . 2
. 5 9 . 2 6 . 7 .
5 2 . . . 7 . . 6
. . 7 . 5 . . 4 .
. 9 . . . . . 5 . | 7 4 5 1 9 2 3 6 8
2 1 6 8 7 3 4 9 5
9 3 8 5 6 4 7 2 1
3 7 2 4 1 5 6 8 9
1 6 4 7 8 9 5 3 2
8 5 9 3 2 6 1 7 4
5 2 3 9 4 7 8 1 6
6 8 7 2 5 1 9 4 3
4 9 1 6 3 8 2 5 7 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_3075_hard | 745192368216873495938564721372415689164789532859326174523947816687251943491638257 #1 Extreme (23968) bf
Hidden Single: r4c3=2
Hidden Single: r4c7=6
Hidden Single: r5c4=7
Empty Rectangle: 5 in b5 (r59c8) => r9c6<>5
Brute Force: r5c7=5
Hidden Single: r1c3=5
Hidden Single: r4c6=5
Hidden Single: r9c... |
sudoku_normal_extremely_hard_129 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .....23..21..7...59..5.........1..8.16......2..9.26.7.52...7..6..7....4..9....... | 745192368216873495938564721372415689164789532859326174523947816687251943491638257 | . . . . . 2 3 . .
2 1 . . 7 . . . 5
9 . . 5 . . . . .
. . . . 1 . . 8 .
1 6 . . . . . . 2
. . 9 . 2 6 . 7 .
5 2 . . . 7 . . 6
. . 7 . . . . 4 .
. 9 . . . . . . . | 7 4 5 1 9 2 3 6 8
2 1 6 8 7 3 4 9 5
9 3 8 5 6 4 7 2 1
3 7 2 4 1 5 6 8 9
1 6 4 7 8 9 5 3 2
8 5 9 3 2 6 1 7 4
5 2 3 9 4 7 8 1 6
6 8 7 2 5 1 9 4 3
4 9 1 6 3 8 2 5 7 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_3075_hard | 745192368216873495938564721372415689164789532859326174523947816687251943491638257 #1 Extreme (23968) bf
Hidden Single: r4c3=2
Hidden Single: r4c7=6
Hidden Single: r5c4=7
Empty Rectangle: 5 in b5 (r59c8) => r9c6<>5
Brute Force: r5c7=5
Hidden Single: r1c3=5
Hidden Single: r4c6=5
Hidden Single: r9c... |
sudoku_normal_hard_130 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .896.2.172.1...9.6....9182...81...726..2.8149412.7968..23........4...2..8..92...1 | 389652417251487936746391825938146572675238149412579683123865794594713268867924351 | . 8 9 6 . 2 . 1 7
2 . 1 . . . 9 . 6
. . . . 9 1 8 2 .
. . 8 1 . . . 7 2
6 . . 2 . 8 1 4 9
4 1 2 . 7 9 6 8 .
. 2 3 . . . . . .
. . 4 . . . 2 . .
8 . . 9 2 . . . 1 | 3 8 9 6 5 2 4 1 7
2 5 1 4 8 7 9 3 6
7 4 6 3 9 1 8 2 5
9 3 8 1 4 6 5 7 2
6 7 5 2 3 8 1 4 9
4 1 2 5 7 9 6 8 3
1 2 3 8 6 5 7 9 4
5 9 4 7 1 3 2 6 8
8 6 7 9 2 4 3 5 1 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_5088_hard | 389652417251487936746391825938146572675238149412579683123865794594713268867924351 #1 Extreme (13472) bf
Hidden Single: r5c7=1
Hidden Single: r6c7=6
Hidden Single: r2c1=2
Hidden Single: r4c9=2
Hidden Single: r4c3=8
Hidden Single: r3c5=9
Hidden Single: r9c5=2
Hidden Single: r5c4=2
Hidden Single... |
sudoku_normal_extremely_hard_130 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .896.2.17......9.6.....182....1...7.6....8..9.12.79.8..23........4...2..8..9..... | 389652417251487936746391825938146572675238149412579683123865794594713268867924351 | . 8 9 6 . 2 . 1 7
. . . . . . 9 . 6
. . . . . 1 8 2 .
. . . 1 . . . 7 .
6 . . . . 8 . . 9
. 1 2 . 7 9 . 8 .
. 2 3 . . . . . .
. . 4 . . . 2 . .
8 . . 9 . . . . . | 3 8 9 6 5 2 4 1 7
2 5 1 4 8 7 9 3 6
7 4 6 3 9 1 8 2 5
9 3 8 1 4 6 5 7 2
6 7 5 2 3 8 1 4 9
4 1 2 5 7 9 6 8 3
1 2 3 8 6 5 7 9 4
5 9 4 7 1 3 2 6 8
8 6 7 9 2 4 3 5 1 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_5088_hard | 389652417251487936746391825938146572675238149412579683123865794594713268867924351 #1 Extreme (13472) bf
Hidden Single: r5c7=1
Hidden Single: r6c7=6
Hidden Single: r2c1=2
Hidden Single: r4c9=2
Hidden Single: r4c3=8
Hidden Single: r3c5=9
Hidden Single: r9c5=2
Hidden Single: r5c4=2
Hidden Single... |
sudoku_normal_hard_131 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ..46..3..6...9..4..2...4..8..6.3...2.4..867..38...9.5...8.1...44..9...1.17...5... | 814672395635198247729354168596731482241586739387429651968213574452967813173845926 | . . 4 6 . . 3 . .
6 . . . 9 . . 4 .
. 2 . . . 4 . . 8
. . 6 . 3 . . . 2
. 4 . . 8 6 7 . .
3 8 . . . 9 . 5 .
. . 8 . 1 . . . 4
4 . . 9 . . . 1 .
1 7 . . . 5 . . . | 8 1 4 6 7 2 3 9 5
6 3 5 1 9 8 2 4 7
7 2 9 3 5 4 1 6 8
5 9 6 7 3 1 4 8 2
2 4 1 5 8 6 7 3 9
3 8 7 4 2 9 6 5 1
9 6 8 2 1 3 5 7 4
4 5 2 9 6 7 8 1 3
1 7 3 8 4 5 9 2 6 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_5844_hard | 814672395635198247729354168596731482241586739387429651968213574452967813173845926 #1 Extreme (16972) bf
Brute Force: r5c5=8
Locked Candidates Type 1 (Pointing): 5 in b5 => r23c4<>5
Finned Swordfish: 8 r168 c267 fr1c1 => r2c2<>8
Locked Candidates Type 1 (Pointing): 8 in b1 => r1c6<>8
Discontinuous Nice Lo... |
sudoku_normal_extremely_hard_131 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ...6..3..6...9..4..2...4..8..6.3...2.4....7..3....9.5...8.1...4...9...1.17...5... | 814672395635198247729354168596731482241586739387429651968213574452967813173845926 | . . . 6 . . 3 . .
6 . . . 9 . . 4 .
. 2 . . . 4 . . 8
. . 6 . 3 . . . 2
. 4 . . . . 7 . .
3 . . . . 9 . 5 .
. . 8 . 1 . . . 4
. . . 9 . . . 1 .
1 7 . . . 5 . . . | 8 1 4 6 7 2 3 9 5
6 3 5 1 9 8 2 4 7
7 2 9 3 5 4 1 6 8
5 9 6 7 3 1 4 8 2
2 4 1 5 8 6 7 3 9
3 8 7 4 2 9 6 5 1
9 6 8 2 1 3 5 7 4
4 5 2 9 6 7 8 1 3
1 7 3 8 4 5 9 2 6 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_5844_hard | 814672395635198247729354168596731482241586739387429651968213574452967813173845926 #1 Extreme (16972) bf
Brute Force: r5c5=8
Locked Candidates Type 1 (Pointing): 5 in b5 => r23c4<>5
Finned Swordfish: 8 r168 c267 fr1c1 => r2c2<>8
Locked Candidates Type 1 (Pointing): 8 in b1 => r1c6<>8
Discontinuous Nice Lo... |
sudoku_normal_hard_132 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 6.....8.2.728..46..1.6..57...17...2.23918675476...4....9..3...71..9...8...7.6...5 | 645379812972815463813642579451793628239186754768524931596238147124957386387461295 | 6 . . . . . 8 . 2
. 7 2 8 . . 4 6 .
. 1 . 6 . . 5 7 .
. . 1 7 . . . 2 .
2 3 9 1 8 6 7 5 4
7 6 . . . 4 . . .
. 9 . . 3 . . . 7
1 . . 9 . . . 8 .
. . 7 . 6 . . . 5 | 6 4 5 3 7 9 8 1 2
9 7 2 8 1 5 4 6 3
8 1 3 6 4 2 5 7 9
4 5 1 7 9 3 6 2 8
2 3 9 1 8 6 7 5 4
7 6 8 5 2 4 9 3 1
5 9 6 2 3 8 1 4 7
1 2 4 9 5 7 3 8 6
3 8 7 4 6 1 2 9 5 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_7147_hard | 645379812972815463813642579451793628239186754768524931596238147124957386387461295 #1 Extreme (22132) bf
Brute Force: r5c8=5
Forcing Net Contradiction in c9 => r1c5<>5
r1c5=5 (r1c5<>9) (r1c5<>7 r1c6=7 r1c6<>9) (r4c5<>5 r4c5=9 r4c1<>9) (r2c5<>5) r2c6<>5 r2c1=5 r2c1<>9 r3c1=9 r1c3<>9 r1c8=9 r2c9<>9
r1c5=5 (r4c5<... |
sudoku_normal_extremely_hard_132 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 6.....8.2.728...6..1.6..57...17...2.2...8....76...4....9..3....1..9...8.....6...5 | 645379812972815463813642579451793628239186754768524931596238147124957386387461295 | 6 . . . . . 8 . 2
. 7 2 8 . . . 6 .
. 1 . 6 . . 5 7 .
. . 1 7 . . . 2 .
2 . . . 8 . . . .
7 6 . . . 4 . . .
. 9 . . 3 . . . .
1 . . 9 . . . 8 .
. . . . 6 . . . 5 | 6 4 5 3 7 9 8 1 2
9 7 2 8 1 5 4 6 3
8 1 3 6 4 2 5 7 9
4 5 1 7 9 3 6 2 8
2 3 9 1 8 6 7 5 4
7 6 8 5 2 4 9 3 1
5 9 6 2 3 8 1 4 7
1 2 4 9 5 7 3 8 6
3 8 7 4 6 1 2 9 5 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_7147_hard | 645379812972815463813642579451793628239186754768524931596238147124957386387461295 #1 Extreme (22132) bf
Brute Force: r5c8=5
Forcing Net Contradiction in c9 => r1c5<>5
r1c5=5 (r1c5<>9) (r1c5<>7 r1c6=7 r1c6<>9) (r4c5<>5 r4c5=9 r4c1<>9) (r2c5<>5) r2c6<>5 r2c1=5 r2c1<>9 r3c1=9 r1c3<>9 r1c8=9 r2c9<>9
r1c5=5 (r4c5<... |
sudoku_normal_hard_133 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 4.8...6.2.25...4..69.4...582.9.4.56..86.5.21454.....89..4.....6..2.31.458....4.2. | 438517692125896437697423158279148563386759214541362789914285376762931845853674921 | 4 . 8 . . . 6 . 2
. 2 5 . . . 4 . .
6 9 . 4 . . . 5 8
2 . 9 . 4 . 5 6 .
. 8 6 . 5 . 2 1 4
5 4 . . . . . 8 9
. . 4 . . . . . 6
. . 2 . 3 1 . 4 5
8 . . . . 4 . 2 . | 4 3 8 5 1 7 6 9 2
1 2 5 8 9 6 4 3 7
6 9 7 4 2 3 1 5 8
2 7 9 1 4 8 5 6 3
3 8 6 7 5 9 2 1 4
5 4 1 3 6 2 7 8 9
9 1 4 2 8 5 3 7 6
7 6 2 9 3 1 8 4 5
8 5 3 6 7 4 9 2 1 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4685_hard | 438517692125896437697423158279148563386759214541362789914285376762931845853674921 #1 Extreme (14022) bf
Hidden Single: r6c1=5
Hidden Single: r4c8=6
Hidden Single: r1c3=8
Hidden Single: r4c5=4
Hidden Single: r1c9=2
Hidden Single: r4c1=2
Hidden Single: r1c1=4
Hidden Single: r7c3=4
Hidden Single... |
sudoku_normal_extremely_hard_133 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ......6...25...4..69.4...58..9...5...86.5.2...4.....89........6..2.31..58....4.2. | 438517692125896437697423158279148563386759214541362789914285376762931845853674921 | . . . . . . 6 . .
. 2 5 . . . 4 . .
6 9 . 4 . . . 5 8
. . 9 . . . 5 . .
. 8 6 . 5 . 2 . .
. 4 . . . . . 8 9
. . . . . . . . 6
. . 2 . 3 1 . . 5
8 . . . . 4 . 2 . | 4 3 8 5 1 7 6 9 2
1 2 5 8 9 6 4 3 7
6 9 7 4 2 3 1 5 8
2 7 9 1 4 8 5 6 3
3 8 6 7 5 9 2 1 4
5 4 1 3 6 2 7 8 9
9 1 4 2 8 5 3 7 6
7 6 2 9 3 1 8 4 5
8 5 3 6 7 4 9 2 1 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4685_hard | 438517692125896437697423158279148563386759214541362789914285376762931845853674921 #1 Extreme (14022) bf
Hidden Single: r6c1=5
Hidden Single: r4c8=6
Hidden Single: r1c3=8
Hidden Single: r4c5=4
Hidden Single: r1c9=2
Hidden Single: r4c1=2
Hidden Single: r1c1=4
Hidden Single: r7c3=4
Hidden Single... |
sudoku_normal_hard_134 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 52...7..387.31.5..9134567..638...9.1...9..3...9213...5367........96.3....8.7..639 | 526897413874312596913456728638275941451968372792134865367529184149683257285741639 | 5 2 . . . 7 . . 3
8 7 . 3 1 . 5 . .
9 1 3 4 5 6 7 . .
6 3 8 . . . 9 . 1
. . . 9 . . 3 . .
. 9 2 1 3 . . . 5
3 6 7 . . . . . .
. . 9 6 . 3 . . .
. 8 . 7 . . 6 3 9 | 5 2 6 8 9 7 4 1 3
8 7 4 3 1 2 5 9 6
9 1 3 4 5 6 7 2 8
6 3 8 2 7 5 9 4 1
4 5 1 9 6 8 3 7 2
7 9 2 1 3 4 8 6 5
3 6 7 5 2 9 1 8 4
1 4 9 6 8 3 2 5 7
2 8 5 7 4 1 6 3 9 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_578_easy | 526897413874312596913456728638275941451968372792134865367529184149683257285741639 #1 Easy (420)
Naked Single: r3c3=3
Hidden Single: r3c5=5
Hidden Single: r6c2=9
Hidden Single: r2c1=8
Hidden Single: r8c4=6
Hidden Single: r7c1=3
Hidden Single: r8c3=9
Hidden Single: r1c9=3
Hidden Single: r4c2=3
... |
sudoku_normal_extremely_hard_134 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 5....7......31.5..91.4.67..6.8...9.1...9..3....21....5.67...........3....8.7...39 | 526897413874312596913456728638275941451968372792134865367529184149683257285741639 | 5 . . . . 7 . . .
. . . 3 1 . 5 . .
9 1 . 4 . 6 7 . .
6 . 8 . . . 9 . 1
. . . 9 . . 3 . .
. . 2 1 . . . . 5
. 6 7 . . . . . .
. . . . . 3 . . .
. 8 . 7 . . . 3 9 | 5 2 6 8 9 7 4 1 3
8 7 4 3 1 2 5 9 6
9 1 3 4 5 6 7 2 8
6 3 8 2 7 5 9 4 1
4 5 1 9 6 8 3 7 2
7 9 2 1 3 4 8 6 5
3 6 7 5 2 9 1 8 4
1 4 9 6 8 3 2 5 7
2 8 5 7 4 1 6 3 9 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_578_easy | 526897413874312596913456728638275941451968372792134865367529184149683257285741639 #1 Easy (420)
Naked Single: r3c3=3
Hidden Single: r3c5=5
Hidden Single: r6c2=9
Hidden Single: r2c1=8
Hidden Single: r8c4=6
Hidden Single: r7c1=3
Hidden Single: r8c3=9
Hidden Single: r1c9=3
Hidden Single: r4c2=3
... |
sudoku_normal_hard_135 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 1293.756.3.4...7987.8..9213983.1.42..4..9..3....8.3.5.......3.....63....832...671 | 129387564364521798758469213983715426541296837276843159695178342417632985832954671 | 1 2 9 3 . 7 5 6 .
3 . 4 . . . 7 9 8
7 . 8 . . 9 2 1 3
9 8 3 . 1 . 4 2 .
. 4 . . 9 . . 3 .
. . . 8 . 3 . 5 .
. . . . . . 3 . .
. . . 6 3 . . . .
8 3 2 . . . 6 7 1 | 1 2 9 3 8 7 5 6 4
3 6 4 5 2 1 7 9 8
7 5 8 4 6 9 2 1 3
9 8 3 7 1 5 4 2 6
5 4 1 2 9 6 8 3 7
2 7 6 8 4 3 1 5 9
6 9 5 1 7 8 3 4 2
4 1 7 6 3 2 9 8 5
8 3 2 9 5 4 6 7 1 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_421_easy | 129387564364521798758469213983715426541296837276843159695178342417632985832954671 #1 Easy (354)
Hidden Single: r5c8=3
Hidden Single: r4c2=8
Hidden Single: r9c2=3
Hidden Single: r2c1=3
Hidden Single: r3c8=1
Hidden Single: r4c3=3
Hidden Single: r1c4=3
Hidden Single: r9c7=6
Naked Single: r4c7=4
... |
sudoku_normal_extremely_hard_135 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 1.9..75........79.7.8..9..39...1..2..4..9.......8.3.5.......3.....63....8.2....71 | 129387564364521798758469213983715426541296837276843159695178342417632985832954671 | 1 . 9 . . 7 5 . .
. . . . . . 7 9 .
7 . 8 . . 9 . . 3
9 . . . 1 . . 2 .
. 4 . . 9 . . . .
. . . 8 . 3 . 5 .
. . . . . . 3 . .
. . . 6 3 . . . .
8 . 2 . . . . 7 1 | 1 2 9 3 8 7 5 6 4
3 6 4 5 2 1 7 9 8
7 5 8 4 6 9 2 1 3
9 8 3 7 1 5 4 2 6
5 4 1 2 9 6 8 3 7
2 7 6 8 4 3 1 5 9
6 9 5 1 7 8 3 4 2
4 1 7 6 3 2 9 8 5
8 3 2 9 5 4 6 7 1 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_421_easy | 129387564364521798758469213983715426541296837276843159695178342417632985832954671 #1 Easy (354)
Hidden Single: r5c8=3
Hidden Single: r4c2=8
Hidden Single: r9c2=3
Hidden Single: r2c1=3
Hidden Single: r3c8=1
Hidden Single: r4c3=3
Hidden Single: r1c4=3
Hidden Single: r9c7=6
Naked Single: r4c7=4
... |
sudoku_normal_hard_136 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ..65..1...2......9....9.24.65.1....8..1.859..78..6.5......43....6......2..86..73. | 936524187524718369817396245659137428341285976782469513275843691463971852198652734 | . . 6 5 . . 1 . .
. 2 . . . . . . 9
. . . . 9 . 2 4 .
6 5 . 1 . . . . 8
. . 1 . 8 5 9 . .
7 8 . . 6 . 5 . .
. . . . 4 3 . . .
. 6 . . . . . . 2
. . 8 6 . . 7 3 . | 9 3 6 5 2 4 1 8 7
5 2 4 7 1 8 3 6 9
8 1 7 3 9 6 2 4 5
6 5 9 1 3 7 4 2 8
3 4 1 2 8 5 9 7 6
7 8 2 4 6 9 5 1 3
2 7 5 8 4 3 6 9 1
4 6 3 9 7 1 8 5 2
1 9 8 6 5 2 7 3 4 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_9709_hard | 936524187524718369817396245659137428341285976782469513275843691463971852198652734 #1 Extreme (36400) bf
Brute Force: r5c6=5
Brute Force: r5c5=8
Brute Force: r5c7=9
Locked Candidates Type 1 (Pointing): 9 in b4 => r78c3<>9
Empty Rectangle: 3 in b5 (r24c7) => r2c4<>3
Forcing Chain Contradiction in r4 => ... |
sudoku_normal_extremely_hard_136 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ..65..1...2......9....9.24.65.1....8..1......78..6.5......43....6......2..86..73. | 936524187524718369817396245659137428341285976782469513275843691463971852198652734 | . . 6 5 . . 1 . .
. 2 . . . . . . 9
. . . . 9 . 2 4 .
6 5 . 1 . . . . 8
. . 1 . . . . . .
7 8 . . 6 . 5 . .
. . . . 4 3 . . .
. 6 . . . . . . 2
. . 8 6 . . 7 3 . | 9 3 6 5 2 4 1 8 7
5 2 4 7 1 8 3 6 9
8 1 7 3 9 6 2 4 5
6 5 9 1 3 7 4 2 8
3 4 1 2 8 5 9 7 6
7 8 2 4 6 9 5 1 3
2 7 5 8 4 3 6 9 1
4 6 3 9 7 1 8 5 2
1 9 8 6 5 2 7 3 4 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_9709_hard | 936524187524718369817396245659137428341285976782469513275843691463971852198652734 #1 Extreme (36400) bf
Brute Force: r5c6=5
Brute Force: r5c5=8
Brute Force: r5c7=9
Locked Candidates Type 1 (Pointing): 9 in b4 => r78c3<>9
Empty Rectangle: 3 in b5 (r24c7) => r2c4<>3
Forcing Chain Contradiction in r4 => ... |
sudoku_normal_hard_137 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .3.4...2.1...9.5....7..2.......8..1.8..2...59..69..8....13...7.7...6.1...4...7..5 | 935418726162793584487652391293586417874231659516974832651349278729865143348127965 | . 3 . 4 . . . 2 .
1 . . . 9 . 5 . .
. . 7 . . 2 . . .
. . . . 8 . . 1 .
8 . . 2 . . . 5 9
. . 6 9 . . 8 . .
. . 1 3 . . . 7 .
7 . . . 6 . 1 . .
. 4 . . . 7 . . 5 | 9 3 5 4 1 8 7 2 6
1 6 2 7 9 3 5 8 4
4 8 7 6 5 2 3 9 1
2 9 3 5 8 6 4 1 7
8 7 4 2 3 1 6 5 9
5 1 6 9 7 4 8 3 2
6 5 1 3 4 9 2 7 8
7 2 9 8 6 5 1 4 3
3 4 8 1 2 7 9 6 5 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4848_hard | 935418726162793584487652391293586417874231659516974832651349278729865143348127965 #1 Extreme (26792) bf
Brute Force: r5c4=2
Finned Swordfish: 2 r268 c239 fr6c1 => r4c23<>2
Forcing Chain Contradiction in r1 => r7c7<>6
r7c7=6 r7c2<>6 r79c1=6 r1c1<>6
r7c7=6 r5c7<>6 r5c6=6 r1c6<>6
r7c7=6 r1c7<>6
r7c7=6 r9c... |
sudoku_normal_extremely_hard_137 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .3.4...2.1...9.5....7..2.......8..1.8......59..69..8....13...7.7...6.1...4...7..5 | 935418726162793584487652391293586417874231659516974832651349278729865143348127965 | . 3 . 4 . . . 2 .
1 . . . 9 . 5 . .
. . 7 . . 2 . . .
. . . . 8 . . 1 .
8 . . . . . . 5 9
. . 6 9 . . 8 . .
. . 1 3 . . . 7 .
7 . . . 6 . 1 . .
. 4 . . . 7 . . 5 | 9 3 5 4 1 8 7 2 6
1 6 2 7 9 3 5 8 4
4 8 7 6 5 2 3 9 1
2 9 3 5 8 6 4 1 7
8 7 4 2 3 1 6 5 9
5 1 6 9 7 4 8 3 2
6 5 1 3 4 9 2 7 8
7 2 9 8 6 5 1 4 3
3 4 8 1 2 7 9 6 5 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4848_hard | 935418726162793584487652391293586417874231659516974832651349278729865143348127965 #1 Extreme (26792) bf
Brute Force: r5c4=2
Finned Swordfish: 2 r268 c239 fr6c1 => r4c23<>2
Forcing Chain Contradiction in r1 => r7c7<>6
r7c7=6 r7c2<>6 r79c1=6 r1c1<>6
r7c7=6 r5c7<>6 r5c6=6 r1c6<>6
r7c7=6 r1c7<>6
r7c7=6 r9c... |
sudoku_normal_hard_138 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 9....471..719....3.5.........32..4..7...4923..2.....5.6..79.....8.46.9.......8... | 968354712271986543354172896893215467715649238426837159642791385587463921139528674 | 9 . . . . 4 7 1 .
. 7 1 9 . . . . 3
. 5 . . . . . . .
. . 3 2 . . 4 . .
7 . . . 4 9 2 3 .
. 2 . . . . . 5 .
6 . . 7 9 . . . .
. 8 . 4 6 . 9 . .
. . . . . 8 . . . | 9 6 8 3 5 4 7 1 2
2 7 1 9 8 6 5 4 3
3 5 4 1 7 2 8 9 6
8 9 3 2 1 5 4 6 7
7 1 5 6 4 9 2 3 8
4 2 6 8 3 7 1 5 9
6 4 2 7 9 1 3 8 5
5 8 7 4 6 3 9 2 1
1 3 9 5 2 8 6 7 4 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_3325_hard | 968354712271986543354172896893215467715649238426837159642791385587463921139528674 #1 Extreme (34122) bf
Brute Force: r5c8=3
Brute Force: r5c5=4
Locked Candidates Type 2 (Claiming): 4 in c2 => r79c3,r9c1<>4
XYZ-Wing: 2/5/7 in r78c3,r8c8 => r8c1<>2
Discontinuous Nice Loop: 2 r2c8 -2- r8c8 -7- r8c3 =7= r9c3... |
sudoku_normal_extremely_hard_138 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 9....471..719....3.5.........32..4..7....92...2.....5.6..79.....8.46.9.......8... | 968354712271986543354172896893215467715649238426837159642791385587463921139528674 | 9 . . . . 4 7 1 .
. 7 1 9 . . . . 3
. 5 . . . . . . .
. . 3 2 . . 4 . .
7 . . . . 9 2 . .
. 2 . . . . . 5 .
6 . . 7 9 . . . .
. 8 . 4 6 . 9 . .
. . . . . 8 . . . | 9 6 8 3 5 4 7 1 2
2 7 1 9 8 6 5 4 3
3 5 4 1 7 2 8 9 6
8 9 3 2 1 5 4 6 7
7 1 5 6 4 9 2 3 8
4 2 6 8 3 7 1 5 9
6 4 2 7 9 1 3 8 5
5 8 7 4 6 3 9 2 1
1 3 9 5 2 8 6 7 4 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_3325_hard | 968354712271986543354172896893215467715649238426837159642791385587463921139528674 #1 Extreme (34122) bf
Brute Force: r5c8=3
Brute Force: r5c5=4
Locked Candidates Type 2 (Claiming): 4 in c2 => r79c3,r9c1<>4
XYZ-Wing: 2/5/7 in r78c3,r8c8 => r8c1<>2
Discontinuous Nice Loop: 2 r2c8 -2- r8c8 -7- r8c3 =7= r9c3... |
sudoku_normal_hard_139 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .2..4..6.5..73.4.......8..7...9.4.8.4..87.3.9819..3.....5.6....6..4.7..5.7.3..6.. | 728549163596731428143628957367914582452876319819253746935162874681497235274385691 | . 2 . . 4 . . 6 .
5 . . 7 3 . 4 . .
. . . . . 8 . . 7
. . . 9 . 4 . 8 .
4 . . 8 7 . 3 . 9
8 1 9 . . 3 . . .
. . 5 . 6 . . . .
6 . . 4 . 7 . . 5
. 7 . 3 . . 6 . . | 7 2 8 5 4 9 1 6 3
5 9 6 7 3 1 4 2 8
1 4 3 6 2 8 9 5 7
3 6 7 9 1 4 5 8 2
4 5 2 8 7 6 3 1 9
8 1 9 2 5 3 7 4 6
9 3 5 1 6 2 8 7 4
6 8 1 4 9 7 2 3 5
2 7 4 3 8 5 6 9 1 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_6848_hard | 728549163596731428143628957367914582452876319819253746935162874681497235274385691 #1 Extreme (22024) bf
Hidden Pair: 3,4 in r46c6 => r4c6<>1, r46c6<>2, r46c6<>5, r46c6<>6
Brute Force: r5c4=8
Hidden Single: r6c1=8
Hidden Single: r6c6=3
Naked Single: r4c6=4
Locked Candidates Type 1 (Pointing): 7 in b4 =... |
sudoku_normal_extremely_hard_139 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .2..4..6.5..73.4.......8..7...9...8.4...7.3.9.19........5.6....6..4.7..5.7.3..6.. | 728549163596731428143628957367914582452876319819253746935162874681497235274385691 | . 2 . . 4 . . 6 .
5 . . 7 3 . 4 . .
. . . . . 8 . . 7
. . . 9 . . . 8 .
4 . . . 7 . 3 . 9
. 1 9 . . . . . .
. . 5 . 6 . . . .
6 . . 4 . 7 . . 5
. 7 . 3 . . 6 . . | 7 2 8 5 4 9 1 6 3
5 9 6 7 3 1 4 2 8
1 4 3 6 2 8 9 5 7
3 6 7 9 1 4 5 8 2
4 5 2 8 7 6 3 1 9
8 1 9 2 5 3 7 4 6
9 3 5 1 6 2 8 7 4
6 8 1 4 9 7 2 3 5
2 7 4 3 8 5 6 9 1 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_6848_hard | 728549163596731428143628957367914582452876319819253746935162874681497235274385691 #1 Extreme (22024) bf
Hidden Pair: 3,4 in r46c6 => r4c6<>1, r46c6<>2, r46c6<>5, r46c6<>6
Brute Force: r5c4=8
Hidden Single: r6c1=8
Hidden Single: r6c6=3
Naked Single: r4c6=4
Locked Candidates Type 1 (Pointing): 7 in b4 =... |
sudoku_normal_hard_140 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ..8....6.9..38...7.....58..2.4539..6.19467.2.3..128..96.........23.9.6...97.....2 | 158972463946381257732645891274539186819467325365128749681253974523794618497816532 | . . 8 . . . . 6 .
9 . . 3 8 . . . 7
. . . . . 5 8 . .
2 . 4 5 3 9 . . 6
. 1 9 4 6 7 . 2 .
3 . . 1 2 8 . . 9
6 . . . . . . . .
. 2 3 . 9 . 6 . .
. 9 7 . . . . . 2 | 1 5 8 9 7 2 4 6 3
9 4 6 3 8 1 2 5 7
7 3 2 6 4 5 8 9 1
2 7 4 5 3 9 1 8 6
8 1 9 4 6 7 3 2 5
3 6 5 1 2 8 7 4 9
6 8 1 2 5 3 9 7 4
5 2 3 7 9 4 6 1 8
4 9 7 8 1 6 5 3 2 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_7032_hard | 158972463946381257732645891274539186819467325365128749681253974523794618497816532 #1 Extreme (33160) bf
Brute Force: r5c5=6
Hidden Single: r4c4=5
Locked Candidates Type 1 (Pointing): 7 in b5 => r178c6<>7
Locked Candidates Type 1 (Pointing): 8 in b5 => r789c6<>8
Locked Candidates Type 1 (Pointing): 9 in b... |
sudoku_normal_extremely_hard_140 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ..8....6.9..38...7.....58..2...3...6.1.4...2.3..12...96.........23.9.6...97.....2 | 158972463946381257732645891274539186819467325365128749681253974523794618497816532 | . . 8 . . . . 6 .
9 . . 3 8 . . . 7
. . . . . 5 8 . .
2 . . . 3 . . . 6
. 1 . 4 . . . 2 .
3 . . 1 2 . . . 9
6 . . . . . . . .
. 2 3 . 9 . 6 . .
. 9 7 . . . . . 2 | 1 5 8 9 7 2 4 6 3
9 4 6 3 8 1 2 5 7
7 3 2 6 4 5 8 9 1
2 7 4 5 3 9 1 8 6
8 1 9 4 6 7 3 2 5
3 6 5 1 2 8 7 4 9
6 8 1 2 5 3 9 7 4
5 2 3 7 9 4 6 1 8
4 9 7 8 1 6 5 3 2 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_7032_hard | 158972463946381257732645891274539186819467325365128749681253974523794618497816532 #1 Extreme (33160) bf
Brute Force: r5c5=6
Hidden Single: r4c4=5
Locked Candidates Type 1 (Pointing): 7 in b5 => r178c6<>7
Locked Candidates Type 1 (Pointing): 8 in b5 => r789c6<>8
Locked Candidates Type 1 (Pointing): 9 in b... |
sudoku_normal_hard_141 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 7..2..6....8.36.......7..5..7...2.45..97.5..12...4.7..31.4....9.8.......6....34.. | 745281693928536174163974258876312945439765821251849736317428569584697312692153487 | 7 . . 2 . . 6 . .
. . 8 . 3 6 . . .
. . . . 7 . . 5 .
. 7 . . . 2 . 4 5
. . 9 7 . 5 . . 1
2 . . . 4 . 7 . .
3 1 . 4 . . . . 9
. 8 . . . . . . .
6 . . . . 3 4 . . | 7 4 5 2 8 1 6 9 3
9 2 8 5 3 6 1 7 4
1 6 3 9 7 4 2 5 8
8 7 6 3 1 2 9 4 5
4 3 9 7 6 5 8 2 1
2 5 1 8 4 9 7 3 6
3 1 7 4 2 8 5 6 9
5 8 4 6 9 7 3 1 2
6 9 2 1 5 3 4 8 7 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4076_hard | 745281693928536174163974258876312945439765821251849736317428569584697312692153487 #1 Extreme (22156) bf
Brute Force: r5c6=5
Hidden Single: r5c4=7
Turbot Fish: 5 r1c5 =5= r2c4 -5- r2c1 =5= r8c1 => r8c5<>5
Finned Swordfish: 5 r169 c235 fr9c4 => r7c5<>5
Forcing Chain Contradiction in r4 => r4c4<>8
r4c4=8 ... |
sudoku_normal_extremely_hard_141 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 7..2..6....8.36.......7..5..7...2.45..9.....12...4.7..31.4....9.8.......6....34.. | 745281693928536174163974258876312945439765821251849736317428569584697312692153487 | 7 . . 2 . . 6 . .
. . 8 . 3 6 . . .
. . . . 7 . . 5 .
. 7 . . . 2 . 4 5
. . 9 . . . . . 1
2 . . . 4 . 7 . .
3 1 . 4 . . . . 9
. 8 . . . . . . .
6 . . . . 3 4 . . | 7 4 5 2 8 1 6 9 3
9 2 8 5 3 6 1 7 4
1 6 3 9 7 4 2 5 8
8 7 6 3 1 2 9 4 5
4 3 9 7 6 5 8 2 1
2 5 1 8 4 9 7 3 6
3 1 7 4 2 8 5 6 9
5 8 4 6 9 7 3 1 2
6 9 2 1 5 3 4 8 7 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4076_hard | 745281693928536174163974258876312945439765821251849736317428569584697312692153487 #1 Extreme (22156) bf
Brute Force: r5c6=5
Hidden Single: r5c4=7
Turbot Fish: 5 r1c5 =5= r2c4 -5- r2c1 =5= r8c1 => r8c5<>5
Finned Swordfish: 5 r169 c235 fr9c4 => r7c5<>5
Forcing Chain Contradiction in r4 => r4c4<>8
r4c4=8 ... |
sudoku_normal_hard_142 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .2.1...6.7.4.6..2....2..7...6..1.4..3718456924.56.2......4.1.36.....8.49.4..261.. | 928174365714563928653289714862917453371845692495632871287491536136758249549326187 | . 2 . 1 . . . 6 .
7 . 4 . 6 . . 2 .
. . . 2 . . 7 . .
. 6 . . 1 . 4 . .
3 7 1 8 4 5 6 9 2
4 . 5 6 . 2 . . .
. . . 4 . 1 . 3 6
. . . . . 8 . 4 9
. 4 . . 2 6 1 . . | 9 2 8 1 7 4 3 6 5
7 1 4 5 6 3 9 2 8
6 5 3 2 8 9 7 1 4
8 6 2 9 1 7 4 5 3
3 7 1 8 4 5 6 9 2
4 9 5 6 3 2 8 7 1
2 8 7 4 9 1 5 3 6
1 3 6 7 5 8 2 4 9
5 4 9 3 2 6 1 8 7 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_7371_hard | 928174365714563928653289714862917453371845692495632871287491536136758249549326187 #1 Extreme (25816) bf
Hidden Single: r6c1=4
Hidden Single: r8c8=4
Hidden Single: r7c6=1
Turbot Fish: 1 r2c9 =1= r2c2 -1- r6c2 =1= r5c3 => r5c9<>1
Brute Force: r5c8=9
Hidden Single: r5c3=1
Locked Candidates Type 1 (Poi... |
sudoku_normal_extremely_hard_142 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | .2.1...6.7.4.6..2....2..7...6..1.4..37..4.6....5.........4...3......8..9.4..2.1.. | 928174365714563928653289714862917453371845692495632871287491536136758249549326187 | . 2 . 1 . . . 6 .
7 . 4 . 6 . . 2 .
. . . 2 . . 7 . .
. 6 . . 1 . 4 . .
3 7 . . 4 . 6 . .
. . 5 . . . . . .
. . . 4 . . . 3 .
. . . . . 8 . . 9
. 4 . . 2 . 1 . . | 9 2 8 1 7 4 3 6 5
7 1 4 5 6 3 9 2 8
6 5 3 2 8 9 7 1 4
8 6 2 9 1 7 4 5 3
3 7 1 8 4 5 6 9 2
4 9 5 6 3 2 8 7 1
2 8 7 4 9 1 5 3 6
1 3 6 7 5 8 2 4 9
5 4 9 3 2 6 1 8 7 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_7371_hard | 928174365714563928653289714862917453371845692495632871287491536136758249549326187 #1 Extreme (25816) bf
Hidden Single: r6c1=4
Hidden Single: r8c8=4
Hidden Single: r7c6=1
Turbot Fish: 1 r2c9 =1= r2c2 -1- r6c2 =1= r5c3 => r5c9<>1
Brute Force: r5c8=9
Hidden Single: r5c3=1
Locked Candidates Type 1 (Poi... |
sudoku_normal_hard_143 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 1...8......9..76..65.2.....8..1.....32.458.....4..6..37......19.....43.8..3...7.. | 147689532239547681658231974875193246326458197914726853782365419561974328493812765 | 1 . . . 8 . . . .
. . 9 . . 7 6 . .
6 5 . 2 . . . . .
8 . . 1 . . . . .
3 2 . 4 5 8 . . .
. . 4 . . 6 . . 3
7 . . . . . . 1 9
. . . . . 4 3 . 8
. . 3 . . . 7 . . | 1 4 7 6 8 9 5 3 2
2 3 9 5 4 7 6 8 1
6 5 8 2 3 1 9 7 4
8 7 5 1 9 3 2 4 6
3 2 6 4 5 8 1 9 7
9 1 4 7 2 6 8 5 3
7 8 2 3 6 5 4 1 9
5 6 1 9 7 4 3 2 8
4 9 3 8 1 2 7 6 5 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_5980_hard | 147689532239547681658231974875193246326458197914726853782365419561974328493812765 #1 Extreme (31762) bf
Brute Force: r5c4=4
Finned X-Wing: 4 r17 c27 fr1c8 fr1c9 => r3c7<>4
Forcing Chain Contradiction in c1 => r8c4<>6
r8c4=6 r1c4<>6 r3c5=6 r3c1<>6
r8c4=6 r8c4<>7 r6c4=7 r6c4<>8 r5c6=8 r5c6<>3 r5c1=3 r5c1<>6
... |
sudoku_normal_extremely_hard_143 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 1...8......9..76...5.2.....8..1......2..5......4..6..37......19.....43.8..3...7.. | 147689532239547681658231974875193246326458197914726853782365419561974328493812765 | 1 . . . 8 . . . .
. . 9 . . 7 6 . .
. 5 . 2 . . . . .
8 . . 1 . . . . .
. 2 . . 5 . . . .
. . 4 . . 6 . . 3
7 . . . . . . 1 9
. . . . . 4 3 . 8
. . 3 . . . 7 . . | 1 4 7 6 8 9 5 3 2
2 3 9 5 4 7 6 8 1
6 5 8 2 3 1 9 7 4
8 7 5 1 9 3 2 4 6
3 2 6 4 5 8 1 9 7
9 1 4 7 2 6 8 5 3
7 8 2 3 6 5 4 1 9
5 6 1 9 7 4 3 2 8
4 9 3 8 1 2 7 6 5 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_5980_hard | 147689532239547681658231974875193246326458197914726853782365419561974328493812765 #1 Extreme (31762) bf
Brute Force: r5c4=4
Finned X-Wing: 4 r17 c27 fr1c8 fr1c9 => r3c7<>4
Forcing Chain Contradiction in c1 => r8c4<>6
r8c4=6 r1c4<>6 r3c5=6 r3c1<>6
r8c4=6 r8c4<>7 r6c4=7 r6c4<>8 r5c6=8 r5c6<>3 r5c1=3 r5c1<>6
... |
sudoku_normal_hard_144 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 2.8.6...419.8.4..2.....2.8.78.24.5.6...35847..4.7.6.28...42...7..7.8.24....6.7..5 | 278963154195874632436512789783241596962358471541796328319425867657189243824637915 | 2 . 8 . 6 . . . 4
1 9 . 8 . 4 . . 2
. . . . . 2 . 8 .
7 8 . 2 4 . 5 . 6
. . . 3 5 8 4 7 .
. 4 . 7 . 6 . 2 8
. . . 4 2 . . . 7
. . 7 . 8 . 2 4 .
. . . 6 . 7 . . 5 | 2 7 8 9 6 3 1 5 4
1 9 5 8 7 4 6 3 2
4 3 6 5 1 2 7 8 9
7 8 3 2 4 1 5 9 6
9 6 2 3 5 8 4 7 1
5 4 1 7 9 6 3 2 8
3 1 9 4 2 5 8 6 7
6 5 7 1 8 9 2 4 3
8 2 4 6 3 7 9 1 5 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4137_hard | 278963154195874632436512789783241596962358471541796328319425867657189243824637915 #1 Extreme (15614) bf
Hidden Single: r1c3=8
Hidden Single: r3c6=2
Hidden Single: r5c6=8
Hidden Single: r2c9=2
Hidden Single: r4c5=4
Hidden Single: r5c7=4
Hidden Single: r6c9=8
Hidden Single: r7c4=4
Hidden Single... |
sudoku_normal_extremely_hard_144 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 2...6...419.8.4..........8.78.2..5.6....5.....4.7.6.2.....2...7..7.8.24....6.7..5 | 278963154195874632436512789783241596962358471541796328319425867657189243824637915 | 2 . . . 6 . . . 4
1 9 . 8 . 4 . . .
. . . . . . . 8 .
7 8 . 2 . . 5 . 6
. . . . 5 . . . .
. 4 . 7 . 6 . 2 .
. . . . 2 . . . 7
. . 7 . 8 . 2 4 .
. . . 6 . 7 . . 5 | 2 7 8 9 6 3 1 5 4
1 9 5 8 7 4 6 3 2
4 3 6 5 1 2 7 8 9
7 8 3 2 4 1 5 9 6
9 6 2 3 5 8 4 7 1
5 4 1 7 9 6 3 2 8
3 1 9 4 2 5 8 6 7
6 5 7 1 8 9 2 4 3
8 2 4 6 3 7 9 1 5 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4137_hard | 278963154195874632436512789783241596962358471541796328319425867657189243824637915 #1 Extreme (15614) bf
Hidden Single: r1c3=8
Hidden Single: r3c6=2
Hidden Single: r5c6=8
Hidden Single: r2c9=2
Hidden Single: r4c5=4
Hidden Single: r5c7=4
Hidden Single: r6c9=8
Hidden Single: r7c4=4
Hidden Single... |
sudoku_normal_hard_145 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ..8..6..32..35......5.4..1....2..7.1.6.4198.55.1.7..4.1...9...7..9...1.4.5.....9. | 948126573216357489375948612894265731763419825521873946182594367639782154457631298 | . . 8 . . 6 . . 3
2 . . 3 5 . . . .
. . 5 . 4 . . 1 .
. . . 2 . . 7 . 1
. 6 . 4 1 9 8 . 5
5 . 1 . 7 . . 4 .
1 . . . 9 . . . 7
. . 9 . . . 1 . 4
. 5 . . . . . 9 . | 9 4 8 1 2 6 5 7 3
2 1 6 3 5 7 4 8 9
3 7 5 9 4 8 6 1 2
8 9 4 2 6 5 7 3 1
7 6 3 4 1 9 8 2 5
5 2 1 8 7 3 9 4 6
1 8 2 5 9 4 3 6 7
6 3 9 7 8 2 1 5 4
4 5 7 6 3 1 2 9 8 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4365_hard | 948126573216357489375948612894265731763419825521873946182594367639782154457631298 #1 Extreme (38294) bf
Brute Force: r5c5=1
Hidden Single: r4c9=1
Forcing Net Contradiction in c8 => r7c6<>5
r7c6=5 (r8c6<>5 r8c8=5 r1c8<>5) (r4c6<>5) r5c6<>5 r4c5=5 r1c5<>5 r1c5=2 r1c8<>2 r1c8=7
r7c6=5 (r8c6<>5 r8c8=5 r2c8<>5)... |
sudoku_normal_extremely_hard_145 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ..8..6..32..3.......5.4..1....2..7...6.4..8..5.1.7..4.1...9...7..9...1.4.5.....9. | 948126573216357489375948612894265731763419825521873946182594367639782154457631298 | . . 8 . . 6 . . 3
2 . . 3 . . . . .
. . 5 . 4 . . 1 .
. . . 2 . . 7 . .
. 6 . 4 . . 8 . .
5 . 1 . 7 . . 4 .
1 . . . 9 . . . 7
. . 9 . . . 1 . 4
. 5 . . . . . 9 . | 9 4 8 1 2 6 5 7 3
2 1 6 3 5 7 4 8 9
3 7 5 9 4 8 6 1 2
8 9 4 2 6 5 7 3 1
7 6 3 4 1 9 8 2 5
5 2 1 8 7 3 9 4 6
1 8 2 5 9 4 3 6 7
6 3 9 7 8 2 1 5 4
4 5 7 6 3 1 2 9 8 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4365_hard | 948126573216357489375948612894265731763419825521873946182594367639782154457631298 #1 Extreme (38294) bf
Brute Force: r5c5=1
Hidden Single: r4c9=1
Forcing Net Contradiction in c8 => r7c6<>5
r7c6=5 (r8c6<>5 r8c8=5 r1c8<>5) (r4c6<>5) r5c6<>5 r4c5=5 r1c5<>5 r1c5=2 r1c8<>2 r1c8=7
r7c6=5 (r8c6<>5 r8c8=5 r2c8<>5)... |
sudoku_normal_hard_146 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 4.62..8.7..8.......3..8..6......6...641.5....9..7..4.6..4.7.1.9.791....21...29... | 496235817518697243732481965387946521641352798925718436264573189879164352153829674 | 4 . 6 2 . . 8 . 7
. . 8 . . . . . .
. 3 . . 8 . . 6 .
. . . . . 6 . . .
6 4 1 . 5 . . . .
9 . . 7 . . 4 . 6
. . 4 . 7 . 1 . 9
. 7 9 1 . . . . 2
1 . . . 2 9 . . . | 4 9 6 2 3 5 8 1 7
5 1 8 6 9 7 2 4 3
7 3 2 4 8 1 9 6 5
3 8 7 9 4 6 5 2 1
6 4 1 3 5 2 7 9 8
9 2 5 7 1 8 4 3 6
2 6 4 5 7 3 1 8 9
8 7 9 1 6 4 3 5 2
1 5 3 8 2 9 6 7 4 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4177_hard | 496235817518697243732481965387946521641352798925718436264573189879164352153829674 #1 Extreme (42218) bf
Hidden Single: r8c3=9
Empty Rectangle: 9 in b5 (r3c47) => r4c7<>9
Brute Force: r5c2=4
Brute Force: r5c1=6
Brute Force: r5c3=1
Locked Candidates Type 1 (Pointing): 7 in b4 => r4c78<>7
Naked Triple... |
sudoku_normal_extremely_hard_146 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 4..2..8.7..8.......3..8..6......6.......5....9..7..4.6..4.7.1.9.7.1....21...29... | 496235817518697243732481965387946521641352798925718436264573189879164352153829674 | 4 . . 2 . . 8 . 7
. . 8 . . . . . .
. 3 . . 8 . . 6 .
. . . . . 6 . . .
. . . . 5 . . . .
9 . . 7 . . 4 . 6
. . 4 . 7 . 1 . 9
. 7 . 1 . . . . 2
1 . . . 2 9 . . . | 4 9 6 2 3 5 8 1 7
5 1 8 6 9 7 2 4 3
7 3 2 4 8 1 9 6 5
3 8 7 9 4 6 5 2 1
6 4 1 3 5 2 7 9 8
9 2 5 7 1 8 4 3 6
2 6 4 5 7 3 1 8 9
8 7 9 1 6 4 3 5 2
1 5 3 8 2 9 6 7 4 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4177_hard | 496235817518697243732481965387946521641352798925718436264573189879164352153829674 #1 Extreme (42218) bf
Hidden Single: r8c3=9
Empty Rectangle: 9 in b5 (r3c47) => r4c7<>9
Brute Force: r5c2=4
Brute Force: r5c1=6
Brute Force: r5c3=1
Locked Candidates Type 1 (Pointing): 7 in b4 => r4c78<>7
Naked Triple... |
sudoku_normal_hard_147 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ....4..1....9.27.....6.......6..3.....276.9..8......5..1..5...3..3..92..4......8. | 978345612651982734324671598146593827532768941897124356219856473783419265465237189 | . . . . 4 . . 1 .
. . . 9 . 2 7 . .
. . . 6 . . . . .
. . 6 . . 3 . . .
. . 2 7 6 . 9 . .
8 . . . . . . 5 .
. 1 . . 5 . . . 3
. . 3 . . 9 2 . .
4 . . . . . . 8 . | 9 7 8 3 4 5 6 1 2
6 5 1 9 8 2 7 3 4
3 2 4 6 7 1 5 9 8
1 4 6 5 9 3 8 2 7
5 3 2 7 6 8 9 4 1
8 9 7 1 2 4 3 5 6
2 1 9 8 5 6 4 7 3
7 8 3 4 1 9 2 6 5
4 6 5 2 3 7 1 8 9 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_8325_hard | 978345612651982734324671598146593827532768941897124356219856473783419265465237189 #1 Extreme (34946) bf
Grouped Discontinuous Nice Loop: 5 r1c1 -5- r2c123 =5= r2c9 -5- r8c9 =5= r8c12 -5- r9c3 =5= r123c3 -5- r1c1 => r1c1<>5
Grouped Discontinuous Nice Loop: 5 r1c2 -5- r2c123 =5= r2c9 -5- r8c9 =5= r8c12 -5- r9c3 =5=... |
sudoku_normal_extremely_hard_147 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ....4..1....9.27.....6.......6..3.....27..9..8......5..1..5...3..3..92..4......8. | 978345612651982734324671598146593827532768941897124356219856473783419265465237189 | . . . . 4 . . 1 .
. . . 9 . 2 7 . .
. . . 6 . . . . .
. . 6 . . 3 . . .
. . 2 7 . . 9 . .
8 . . . . . . 5 .
. 1 . . 5 . . . 3
. . 3 . . 9 2 . .
4 . . . . . . 8 . | 9 7 8 3 4 5 6 1 2
6 5 1 9 8 2 7 3 4
3 2 4 6 7 1 5 9 8
1 4 6 5 9 3 8 2 7
5 3 2 7 6 8 9 4 1
8 9 7 1 2 4 3 5 6
2 1 9 8 5 6 4 7 3
7 8 3 4 1 9 2 6 5
4 6 5 2 3 7 1 8 9 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_8325_hard | 978345612651982734324671598146593827532768941897124356219856473783419265465237189 #1 Extreme (34946) bf
Grouped Discontinuous Nice Loop: 5 r1c1 -5- r2c123 =5= r2c9 -5- r8c9 =5= r8c12 -5- r9c3 =5= r123c3 -5- r1c1 => r1c1<>5
Grouped Discontinuous Nice Loop: 5 r1c2 -5- r2c123 =5= r2c9 -5- r8c9 =5= r8c12 -5- r9c3 =5=... |
sudoku_normal_hard_148 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 6.472......54.6...7..39..4697.65...4.5293476.4.6.7295..6.5..4...49.6713...7.4.6.. | 694725813315486279728391546971658324852934761436172958263519487549867132187243695 | 6 . 4 7 2 . . . .
. . 5 4 . 6 . . .
7 . . 3 9 . . 4 6
9 7 . 6 5 . . . 4
. 5 2 9 3 4 7 6 .
4 . 6 . 7 2 9 5 .
. 6 . 5 . . 4 . .
. 4 9 . 6 7 1 3 .
. . 7 . 4 . 6 . . | 6 9 4 7 2 5 8 1 3
3 1 5 4 8 6 2 7 9
7 2 8 3 9 1 5 4 6
9 7 1 6 5 8 3 2 4
8 5 2 9 3 4 7 6 1
4 3 6 1 7 2 9 5 8
2 6 3 5 1 9 4 8 7
5 4 9 8 6 7 1 3 2
1 8 7 2 4 3 6 9 5 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_5112_hard | 694725813315486279728391546971658324852934761436172958263519487549867132187243695 #1 Extreme (27098) bf
Hidden Single: r6c3=6
Hidden Single: r4c5=5
Hidden Single: r1c3=4
Hidden Single: r8c5=6
Hidden Single: r4c2=7
Hidden Single: r2c4=4
Hidden Single: r4c1=9
Hidden Single: r4c9=4
Hidden Single... |
sudoku_normal_extremely_hard_148 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | 6..72......5..6...7...9..46...6......529.4.......7295..6.5..4...49...13...7.4.... | 694725813315486279728391546971658324852934761436172958263519487549867132187243695 | 6 . . 7 2 . . . .
. . 5 . . 6 . . .
7 . . . 9 . . 4 6
. . . 6 . . . . .
. 5 2 9 . 4 . . .
. . . . 7 2 9 5 .
. 6 . 5 . . 4 . .
. 4 9 . . . 1 3 .
. . 7 . 4 . . . . | 6 9 4 7 2 5 8 1 3
3 1 5 4 8 6 2 7 9
7 2 8 3 9 1 5 4 6
9 7 1 6 5 8 3 2 4
8 5 2 9 3 4 7 6 1
4 3 6 1 7 2 9 5 8
2 6 3 5 1 9 4 8 7
5 4 9 8 6 7 1 3 2
1 8 7 2 4 3 6 9 5 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_5112_hard | 694725813315486279728391546971658324852934761436172958263519487549867132187243695 #1 Extreme (27098) bf
Hidden Single: r6c3=6
Hidden Single: r4c5=5
Hidden Single: r1c3=4
Hidden Single: r8c5=6
Hidden Single: r4c2=7
Hidden Single: r2c4=4
Hidden Single: r4c1=9
Hidden Single: r4c9=4
Hidden Single... |
sudoku_normal_hard_149 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ...74.19.4...182.7.7.2.9.485........3.71.28...2...4..99.4.27.81...48.97.78.9.1... | 832745196495618237671239548549863712367192854128574369954327681213486975786951423 | . . . 7 4 . 1 9 .
4 . . . 1 8 2 . 7
. 7 . 2 . 9 . 4 8
5 . . . . . . . .
3 . 7 1 . 2 8 . .
. 2 . . . 4 . . 9
9 . 4 . 2 7 . 8 1
. . . 4 8 . 9 7 .
7 8 . 9 . 1 . . . | 8 3 2 7 4 5 1 9 6
4 9 5 6 1 8 2 3 7
6 7 1 2 3 9 5 4 8
5 4 9 8 6 3 7 1 2
3 6 7 1 9 2 8 5 4
1 2 8 5 7 4 3 6 9
9 5 4 3 2 7 6 8 1
2 1 3 4 8 6 9 7 5
7 8 6 9 5 1 4 2 3 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4078_hard | 832745196495618237671239548549863712367192854128574369954327681213486975786951423 #1 Extreme (42008) bf
Hidden Single: r2c9=7
Hidden Single: r9c1=7
Hidden Single: r7c8=8
Hidden Single: r8c7=9
Locked Candidates Type 1 (Pointing): 4 in b4 => r12c2<>4
Locked Candidates Type 2 (Claiming): 2 in r7 => r8c56... |
sudoku_normal_extremely_hard_149 | 9 | 9 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| None | ...7..19.....182...7.2.9.485........3.7...8...2...4..99.4.....1.......7..8.9.1... | 832745196495618237671239548549863712367192854128574369954327681213486975786951423 | . . . 7 . . 1 9 .
. . . . 1 8 2 . .
. 7 . 2 . 9 . 4 8
5 . . . . . . . .
3 . 7 . . . 8 . .
. 2 . . . 4 . . 9
9 . 4 . . . . . 1
. . . . . . . 7 .
. 8 . 9 . 1 . . . | 8 3 2 7 4 5 1 9 6
4 9 5 6 1 8 2 3 7
6 7 1 2 3 9 5 4 8
5 4 9 8 6 3 7 1 2
3 6 7 1 9 2 8 5 4
1 2 8 5 7 4 3 6 9
9 5 4 3 2 7 6 8 1
2 1 3 4 8 6 9 7 5
7 8 6 9 5 1 4 2 3 | Complete the sudoku board based on the rules and visual elements. | 9x9_sudoku_4078_hard | 832745196495618237671239548549863712367192854128574369954327681213486975786951423 #1 Extreme (42008) bf
Hidden Single: r2c9=7
Hidden Single: r9c1=7
Hidden Single: r7c8=8
Hidden Single: r8c7=9
Locked Candidates Type 1 (Pointing): 4 in b4 => r12c2<>4
Locked Candidates Type 2 (Claiming): 2 in r7 => r8c56... |
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