task_name string | initial_board string | solution string | puzzle_id string | title string | rules string | initial_observation string | rows int64 | cols int64 | visual_elements string | description string | task_type string | data_source string | difficulty string | hint string |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
normal_sudoku_4570 | .95..1.7617.965.2...647.195..41.76525...4.718.1.58..4.3..7...6...1.5.437...2...8. | 495821376173965824286473195834197652569342718712586943358714269921658437647239581 | Basic 9x9 Sudoku 4570 | puzzles4_forum_hardest_1905 | 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.
| . 9 5 . . 1 . 7 6
1 7 . 9 6 5 . 2 .
. . 6 4 7 . 1 9 5
. . 4 1 . 7 6 5 2
5 . . . 4 . 7 1 8
. 1 . 5 8 . . 4 .
3 . . 7 . . . 6 .
. . 1 . 5 . 4 3 7
. . . 2 . . . 8 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 495821376173965824286473195834197652569342718712586943358714269921658437647239581 #1 Easy (364)
Naked Single: r4c8=5
Naked Single: r6c8=4
Naked Single: r2c8=2
Naked Single: r1c8=7
Full House: r7c8=6
Hidden Single: r2c4=9
Hidden Single: r3c5=7
Hidden Single: r1c3=5
Hidden Single: r2c1=1
Hid... |
normal_sudoku_3001 | ..4.68..7.....38.....1...9...78.9.4..4.7125.99...467.8..16...8.3....1..6.6...52.. | 234968157196573824578124693617859342843712569952346718421637985385291476769485231 | Basic 9x9 Sudoku 3001 | puzzles4_forum_hardest_1905 | 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.
| . . 4 . 6 8 . . 7
. . . . . 3 8 . .
. . . 1 . . . 9 .
. . 7 8 . 9 . 4 .
. 4 . 7 1 2 5 . 9
9 . . . 4 6 7 . 8
. . 1 6 . . . 8 .
3 . . . . 1 . . 6
. 6 . . . 5 2 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 234968157196573824578124693617859342843712569952346718421637985385291476769485231 #1 Extreme (26692) bf
Brute Force: r5c4=7
Brute Force: r5c5=1
Naked Single: r6c6=6
Naked Single: r4c6=9
Naked Single: r1c6=8
Hidden Single: r8c6=1
Hidden Single: r5c9=9
Skyscraper: 4 in r2c9,r8c7 (connected by r28c... |
normal_sudoku_3981 | ......4.22.18.4.79..492.8.....6..14.14539.627....4.9.84.9.1.78..2.4...9181.7.92.4 | 698537412231864579754921836982675143145398627376142958469213785527486391813759264 | Basic 9x9 Sudoku 3981 | 01_file1 | 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.
| . . . . . . 4 . 2
2 . 1 8 . 4 . 7 9
. . 4 9 2 . 8 . .
. . . 6 . . 1 4 .
1 4 5 3 9 . 6 2 7
. . . . 4 . 9 . 8
4 . 9 . 1 . 7 8 .
. 2 . 4 . . . 9 1
8 1 . 7 . 9 2 . 4 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 698537412231864579754921836982675143145398627376142958469213785527486391813759264 #1 Extreme (22252) bf
Hidden Single: r2c6=4
Hidden Single: r3c3=4
Hidden Single: r3c7=8
Hidden Single: r9c6=9
Hidden Single: r9c2=1
Hidden Single: r8c4=4
Hidden Single: r4c8=4
Hidden Single: r9c7=2
Hidden Single... |
normal_sudoku_982 | .42.1...61.87..3.2...........46.3..1619...783...1.7964296..54.7435.716..781..6... | 342519876158764392967328145874693251619452783523187964296835417435971628781246539 | Basic 9x9 Sudoku 982 | puzzles1_unbiased | 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.
| . 4 2 . 1 . . . 6
1 . 8 7 . . 3 . 2
. . . . . . . . .
. . 4 6 . 3 . . 1
6 1 9 . . . 7 8 3
. . . 1 . 7 9 6 4
2 9 6 . . 5 4 . 7
4 3 5 . 7 1 6 . .
7 8 1 . . 6 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 342519876158764392967328145874693251619452783523187964296835417435971628781246539 #1 Easy (366)
Naked Single: r7c1=2
Hidden Single: r6c9=4
Hidden Single: r6c6=7
Hidden Single: r5c2=1
Hidden Single: r7c3=6
Hidden Single: r8c7=6
Hidden Single: r8c6=1
Naked Single: r8c3=5
Naked Single: r5c3=9
... |
normal_sudoku_2830 | .89.3.7..537....896.47983..9..1.3..7..1.7.9..76..59..1.723.4.9....9.72...9..2..73 | 289536714537241689614798352925183467841672935763459821172364598358917246496825173 | Basic 9x9 Sudoku 2830 | puzzles4_forum_hardest_1905 | 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.
| . 8 9 . 3 . 7 . .
5 3 7 . . . . 8 9
6 . 4 7 9 8 3 . .
9 . . 1 . 3 . . 7
. . 1 . 7 . 9 . .
7 6 . . 5 9 . . 1
. 7 2 3 . 4 . 9 .
. . . 9 . 7 2 . .
. 9 . . 2 . . 7 3 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 289536714537241689614798352925183467841672935763459821172364598358917246496825173 #1 Extreme (3846)
Naked Single: r2c3=7
Hidden Single: r5c7=9
Hidden Single: r9c8=7
Hidden Single: r8c4=9
Hidden Single: r3c4=7
Hidden Single: r7c2=7
Hidden Single: r6c1=7
Hidden Single: r7c4=3
Hidden Single: r3c... |
normal_sudoku_5781 | 5.2..9.8.7...8.4....12.5.393..7..5.11.4953.78.75.2.394..8.9...591.5..8..25....96. | 542379186793186452861245739389764521124953678675821394438697215916532847257418963 | Basic 9x9 Sudoku 5781 | puzzles4_forum_hardest_1905 | 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.
| 5 . 2 . . 9 . 8 .
7 . . . 8 . 4 . .
. . 1 2 . 5 . 3 9
3 . . 7 . . 5 . 1
1 . 4 9 5 3 . 7 8
. 7 5 . 2 . 3 9 4
. . 8 . 9 . . . 5
9 1 . 5 . . 8 . .
2 5 . . . . 9 6 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 542379186793186452861245739389764521124953678675821394438697215916532847257418963 #1 Easy (376)
Naked Single: r3c8=3
Naked Single: r6c8=9
Hidden Single: r6c2=7
Hidden Single: r6c7=3
Hidden Single: r5c4=9
Hidden Single: r8c1=9
Hidden Single: r5c1=1
Hidden Single: r9c7=9
Hidden Single: r8c4=5
... |
normal_sudoku_1661 | 2...8..56..56..2..6..2.5.3..9.754..2..21963...6732859.7..5....3....1.7....1....25 | 234987156975631248618245937193754862852196374467328591789562413526413789341879625 | Basic 9x9 Sudoku 1661 | puzzles4_forum_hardest_1905 | 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.
| 2 . . . 8 . . 5 6
. . 5 6 . . 2 . .
6 . . 2 . 5 . 3 .
. 9 . 7 5 4 . . 2
. . 2 1 9 6 3 . .
. 6 7 3 2 8 5 9 .
7 . . 5 . . . . 3
. . . . 1 . 7 . .
. . 1 . . . . 2 5 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 234987156975631248618245937193754862852196374467328591789562413526413789341879625 #1 Extreme (12506) bf
Hidden Single: r3c6=5
Hidden Single: r6c7=5
Brute Force: r5c6=6
Naked Single: r6c5=2
Naked Single: r6c6=8
Naked Single: r4c4=7
Full House: r5c5=9
Hidden Single: r6c2=6
Hidden Single: r3c4=2... |
normal_sudoku_1221 | 4...968.3.......1..6.1.8..49...7...5.48..2..7..56.9.4..9......22....345...4.2.7.. | 412596873853247916769138524926874135148352697375619248597481362281763459634925781 | Basic 9x9 Sudoku 1221 | puzzles4_forum_hardest_1905 | 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.
| 4 . . . 9 6 8 . 3
. . . . . . . 1 .
. 6 . 1 . 8 . . 4
9 . . . 7 . . . 5
. 4 8 . . 2 . . 7
. . 5 6 . 9 . 4 .
. 9 . . . . . . 2
2 . . . . 3 4 5 .
. . 4 . 2 . 7 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 412596873853247916769138524926874135148352697375619248597481362281763459634925781 #1 Extreme (20866) bf
Grouped Discontinuous Nice Loop: 7 r2c3 -7- r2c46 =7= r1c4 -7- r1c8 -2- r3c78 =2= r3c3 =9= r2c3 => r2c3<>7
Brute Force: r5c6=2
2-String Kite: 9 in r6c6,r8c9 (connected by r8c4,r9c6) => r6c9<>9
Almost Lock... |
normal_sudoku_4345 | .3.4.....26..3.14.874..2.35.1..4.5.9...5...1.54.8..32....35....456.8...33....485. | 931475682265938147874162935618243579723596418549817326182359764456781293397624851 | Basic 9x9 Sudoku 4345 | puzzles4_forum_hardest_1905 | 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.
| . 3 . 4 . . . . .
2 6 . . 3 . 1 4 .
8 7 4 . . 2 . 3 5
. 1 . . 4 . 5 . 9
. . . 5 . . . 1 .
5 4 . 8 . . 3 2 .
. . . 3 5 . . . .
4 5 6 . 8 . . . 3
3 . . . . 4 8 5 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 931475682265938147874162935618243579723596418549817326182359764456781293397624851 #1 Extreme (14190) bf
Hidden Single: r3c3=4
Hidden Single: r8c2=5
Hidden Single: r4c5=4
2-String Kite: 2 in r4c3,r9c5 (connected by r4c4,r5c5) => r9c3<>2
Almost Locked Set XY-Wing: A=r5c124579 {2456789}, B=r1269c3 {15789}, ... |
normal_sudoku_5619 | .6.28.4.5..8..632......78...5.87421..246.97588..52.9.46....25....54681.2.....56.. | 761283495598146327243957861359874216124639758876521934687312549935468172412795683 | Basic 9x9 Sudoku 5619 | puzzles4_forum_hardest_1905 | 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.
| . 6 . 2 8 . 4 . 5
. . 8 . . 6 3 2 .
. . . . . 7 8 . .
. 5 . 8 7 4 2 1 .
. 2 4 6 . 9 7 5 8
8 . . 5 2 . 9 . 4
6 . . . . 2 5 . .
. . 5 4 6 8 1 . 2
. . . . . 5 6 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 761283495598146327243957861359874216124639758876521934687312549935468172412795683 #1 Extreme (11136) bf
Hidden Single: r4c7=2
Brute Force: r5c7=7
Naked Single: r6c7=9
Hidden Single: r4c5=7
Hidden Single: r5c8=5
Hidden Single: r7c7=5
Hidden Single: r4c6=4
Hidden Single: r5c4=6
Hidden Single: r... |
normal_sudoku_3020 | .......5...2..3...6.8......5.374916...963..75467...9.37.651..39.9.3.75.6..5..671. | 371498652952163847648275391523749168819632475467851923786514239194327586235986714 | Basic 9x9 Sudoku 3020 | 01_file1 | 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.
| . . . . . . . 5 .
. . 2 . . 3 . . .
6 . 8 . . . . . .
5 . 3 7 4 9 1 6 .
. . 9 6 3 . . 7 5
4 6 7 . . . 9 . 3
7 . 6 5 1 . . 3 9
. 9 . 3 . 7 5 . 6
. . 5 . . 6 7 1 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 371498652952163847648275391523749168819632475467851923786514239194327586235986714 #1 Extreme (14264) bf
Hidden Single: r6c3=7
Hidden Single: r7c9=9
Hidden Single: r5c5=3
Hidden Single: r8c7=5
Hidden Single: r5c9=5
Hidden Single: r7c3=6
Hidden Single: r5c4=6
Brute Force: r4c5=4
Finned X-Wing: ... |
normal_sudoku_2537 | ...7.6....861.2..7...3.9..6.6.43........6.43.413..867..94.73...65289...3.37..5..9 | 329786154586142397741359826265437981978561432413928675194273568652894713837615249 | Basic 9x9 Sudoku 2537 | puzzles2_17_clue | 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.
| . . . 7 . 6 . . .
. 8 6 1 . 2 . . 7
. . . 3 . 9 . . 6
. 6 . 4 3 . . . .
. . . . 6 . 4 3 .
4 1 3 . . 8 6 7 .
. 9 4 . 7 3 . . .
6 5 2 8 9 . . . 3
. 3 7 . . 5 . . 9 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 329786154586142397741359826265437981978561432413928675194273568652894713837615249 #1 Easy (366)
Naked Single: r8c2=5
Naked Single: r8c4=8
Naked Single: r9c2=3
Naked Single: r7c2=9
Hidden Single: r1c6=6
Hidden Single: r6c7=6
Hidden Single: r4c2=6
Hidden Single: r7c5=7
Hidden Single: r7c6=3
... |
normal_sudoku_6687 | .1.2...4.983574621.5..3.79854..2.....29..6..43617..8...9...5..643....28..753..419 | 617298543983574621254631798548123967729856134361749852192485376436917285875362419 | Basic 9x9 Sudoku 6687 | 01_file1 | 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.
| . 1 . 2 . . . 4 .
9 8 3 5 7 4 6 2 1
. 5 . . 3 . 7 9 8
5 4 . . 2 . . . .
. 2 9 . . 6 . . 4
3 6 1 7 . . 8 . .
. 9 . . . 5 . . 6
4 3 . . . . 2 8 .
. 7 5 3 . . 4 1 9 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 617298543983574621254631798548123967729856134361749852192485376436917285875362419 #1 Easy (208)
Naked Single: r2c2=8
Full House: r2c7=6
Naked Single: r8c2=3
Naked Single: r9c9=9
Naked Single: r4c2=4
Naked Single: r5c2=2
Full House: r3c2=5
Naked Single: r9c8=1
Naked Single: r6c3=1
Naked Sin... |
normal_sudoku_4760 | 2.....1....82415.....56.283..93..7.....692.51.62.75.98.7...68...237...1.4...2.... | 256839147738241569194567283519384726847692351362175498975416832623758914481923675 | Basic 9x9 Sudoku 4760 | puzzles4_forum_hardest_1905 | 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.
| 2 . . . . . 1 . .
. . 8 2 4 1 5 . .
. . . 5 6 . 2 8 3
. . 9 3 . . 7 . .
. . . 6 9 2 . 5 1
. 6 2 . 7 5 . 9 8
. 7 . . . 6 8 . .
. 2 3 7 . . . 1 .
4 . . . 2 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 256839147738241569194567283519384726847692351362175498975416832623758914481923675 #1 Extreme (11290) bf
Locked Candidates Type 1 (Pointing): 3 in b2 => r1c2<>3
Brute Force: r5c6=2
Hidden Single: r3c7=2
Hidden Single: r2c4=2
Hidden Single: r6c5=7
Naked Single: r3c5=6
Hidden Single: r5c4=6
Locked ... |
normal_sudoku_2436 | 1.9.....35..3...9.3.46....2813...27592.73.14664.1..938.3....5.4.9..8.....5..7..69 | 169827453582314697374695812813946275925738146647152938731269584496583721258471369 | Basic 9x9 Sudoku 2436 | puzzles1_unbiased | 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.
| 1 . 9 . . . . . 3
5 . . 3 . . . 9 .
3 . 4 6 . . . . 2
8 1 3 . . . 2 7 5
9 2 . 7 3 . 1 4 6
6 4 . 1 . . 9 3 8
. 3 . . . . 5 . 4
. 9 . . 8 . . . .
. 5 . . 7 . . 6 9 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 169827453582314697374695812813946275925738146647152938731269584496583721258471369 #1 Medium (504)
Hidden Single: r1c3=9
Hidden Single: r7c2=3
Locked Candidates Type 1 (Pointing): 5 in b1 => r2c569<>5
Hidden Single: r4c9=5
Naked Single: r6c8=3
Naked Single: r5c7=1
Full House: r6c7=9
Hidden Single... |
normal_sudoku_2215 | 871562943..91...5.5....9.81968....1.1536874292479.1.6..9...5.7....71............2 | 871562943639148257524379681968234715153687429247951368396825174482713596715496832 | Basic 9x9 Sudoku 2215 | puzzles1_unbiased | 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.
| 8 7 1 5 6 2 9 4 3
. . 9 1 . . . 5 .
5 . . . . 9 . 8 1
9 6 8 . . . . 1 .
1 5 3 6 8 7 4 2 9
2 4 7 9 . 1 . 6 .
. 9 . . . 5 . 7 .
. . . 7 1 . . . .
. . . . . . . . 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 871562943639148257524379681968234715153687429247951368396825174482713596715496832 #1 Unfair (986)
Naked Single: r5c3=3
Naked Single: r1c8=4
Naked Single: r5c7=4
Full House: r5c9=9
Naked Single: r6c3=7
Full House: r4c2=6
Naked Single: r3c8=8
Naked Single: r2c8=5
Hidden Single: r2c3=9
Hidden... |
normal_sudoku_3241 | .7...98....8....9.95...8..6.894.1653.3..9..846..38591.89..1.36....8.31.9.1396..48 | 276549831348176592951238476789421653135697284624385917892714365467853129513962748 | Basic 9x9 Sudoku 3241 | 01_file1 | 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.
| . 7 . . . 9 8 . .
. . 8 . . . . 9 .
9 5 . . . 8 . . 6
. 8 9 4 . 1 6 5 3
. 3 . . 9 . . 8 4
6 . . 3 8 5 9 1 .
8 9 . . 1 . 3 6 .
. . . 8 . 3 1 . 9
. 1 3 9 6 . . 4 8 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 276549831348176592951238476789421653135697284624385917892714365467853129513962748 #1 Extreme (7362)
Hidden Single: r2c3=8
Hidden Single: r8c7=1
Hidden Single: r7c7=3
Hidden Single: r1c6=9
Hidden Single: r4c7=6
Hidden Single: r9c9=8
Hidden Single: r4c3=9
Hidden Single: r6c7=9
Hidden Single: r6... |
normal_sudoku_2697 | 59...37.2...4.75.9..7..5...7.1.3..2.34......7..87.4..3.83.7.2..17.5..3..62534..78 | 594863712236417589817295634761938425342156897958724163483679251179582346625341978 | Basic 9x9 Sudoku 2697 | puzzles1_unbiased | 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.
| 5 9 . . . 3 7 . 2
. . . 4 . 7 5 . 9
. . 7 . . 5 . . .
7 . 1 . 3 . . 2 .
3 4 . . . . . . 7
. . 8 7 . 4 . . 3
. 8 3 . 7 . 2 . .
1 7 . 5 . . 3 . .
6 2 5 3 4 . . 7 8 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 594863712236417589817295634761938425342156897958724163483679251179582346625341978 #1 Extreme (2716)
Hidden Single: r5c1=3
Hidden Single: r3c3=7
Hidden Single: r9c4=3
Hidden Single: r7c7=2
Hidden Single: r7c5=7
Hidden Single: r9c8=7
Hidden Single: r5c9=7
Hidden Single: r9c3=5
Naked Single: r7c... |
normal_sudoku_1187 | ....62...826.5.9..3458972612.46...39.93.4...5..8..94...3..247....2...3...879..... | 179462583826153974345897261214675839793248615568319427631524798952781346487936152 | Basic 9x9 Sudoku 1187 | puzzles1_unbiased | 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.
| . . . . 6 2 . . .
8 2 6 . 5 . 9 . .
3 4 5 8 9 7 2 6 1
2 . 4 6 . . . 3 9
. 9 3 . 4 . . . 5
. . 8 . . 9 4 . .
. 3 . . 2 4 7 . .
. . 2 . . . 3 . .
. 8 7 9 . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 179462583826153974345897261214675839793248615568319427631524798952781346487936152 #1 Unfair (1224)
Naked Single: r3c6=7
Naked Single: r2c7=9
Naked Single: r3c2=4
Naked Single: r3c7=2
Full House: r3c5=9
Hidden Single: r2c3=6
Hidden Single: r7c2=3
Hidden Single: r8c3=2
Hidden Single: r4c9=9
... |
normal_sudoku_4871 | ..1.3.48..4....71.8..1....3.3..1...4......15.61...9...189345267.769825.125.671... | 921736485345298716867154923532817694798463152614529378189345267476982531253671849 | Basic 9x9 Sudoku 4871 | puzzles4_forum_hardest_1905 | 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.
| . . 1 . 3 . 4 8 .
. 4 . . . . 7 1 .
8 . . 1 . . . . 3
. 3 . . 1 . . . 4
. . . . . . 1 5 .
6 1 . . . 9 . . .
1 8 9 3 4 5 2 6 7
. 7 6 9 8 2 5 . 1
2 5 . 6 7 1 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 921736485345298716867154923532817694798463152614529378189345267476982531253671849 #1 Easy (324)
Naked Single: r7c5=4
Hidden Single: r6c2=1
Hidden Single: r7c2=8
Naked Single: r9c2=5
Hidden Single: r7c1=1
Naked Single: r7c4=3
Full House: r7c8=6
Naked Single: r8c6=2
Naked Single: r8c4=9
Nake... |
normal_sudoku_1164 | ......24.32.1648.9.48..2..6.89.....25.279.3...34..6.9.896......2715.....453689127 | 615978243327164859948352716189435672562791384734826591896217435271543968453689127 | Basic 9x9 Sudoku 1164 | puzzles4_forum_hardest_1905 | 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.
| . . . . . . 2 4 .
3 2 . 1 6 4 8 . 9
. 4 8 . . 2 . . 6
. 8 9 . . . . . 2
5 . 2 7 9 . 3 . .
. 3 4 . . 6 . 9 .
8 9 6 . . . . . .
2 7 1 5 . . . . .
4 5 3 6 8 9 1 2 7 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 615978243327164859948352716189435672562791384734826591896217435271543968453689127 #1 Easy (322)
Naked Single: r7c3=6
Naked Single: r9c9=7
Full House: r9c8=2
Hidden Single: r6c3=4
Hidden Single: r6c2=3
Hidden Single: r5c5=9
Hidden Single: r2c2=2
Naked Single: r7c2=9
Full House: r8c1=2
Hidde... |
normal_sudoku_4940 | 3..78.6.25672.384.2.86...73...17..387..9.8.6.8....67...7....48..82.6.3.74.38.7.26 | 394785612567213849218649573645172938731958264829436751976321485182564397453897126 | Basic 9x9 Sudoku 4940 | 01_file1 | 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.
| 3 . . 7 8 . 6 . 2
5 6 7 2 . 3 8 4 .
2 . 8 6 . . . 7 3
. . . 1 7 . . 3 8
7 . . 9 . 8 . 6 .
8 . . . . 6 7 . .
. 7 . . . . 4 8 .
. 8 2 . 6 . 3 . 7
4 . 3 8 . 7 . 2 6 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 394785612567213849218649573645172938731958264829436751976321485182564397453897126 #1 Extreme (3072)
Hidden Single: r3c3=8
Hidden Single: r6c1=8
Hidden Single: r3c4=6
Hidden Single: r4c5=7
Hidden Single: r8c9=7
Hidden Single: r1c4=7
Hidden Single: r9c4=8
Hidden Single: r5c6=8
Hidden Single: r1... |
normal_sudoku_2937 | .2..8....8.1....476....42..98..4.7....39....617...5.2..1.3....4.69...5..7....6..2 | 427689153891532647635714298986243715253971486174865329512397864369428571748156932 | Basic 9x9 Sudoku 2937 | puzzles4_forum_hardest_1905 | 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.
| . 2 . . 8 . . . .
8 . 1 . . . . 4 7
6 . . . . 4 2 . .
9 8 . . 4 . 7 . .
. . 3 9 . . . . 6
1 7 . . . 5 . 2 .
. 1 . 3 . . . . 4
. 6 9 . . . 5 . .
7 . . . . 6 . . 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 427689153891532647635714298986243715253971486174865329512397864369428571748156932 #1 Extreme (10532)
Hidden Single: r4c1=9
Hidden Single: r8c2=6
Discontinuous Nice Loop: 8 r8c4 -8- r6c4 -6- r6c3 -4- r1c3 =4= r1c1 -4- r8c1 =4= r8c4 => r8c4<>8
Grouped Discontinuous Nice Loop: 7 r3c5 -7- r3c3 =7= r1c3 =4= r1c1... |
normal_sudoku_5252 | .....31..3..1..62..5..6...3..5....48.9.8.....2...45..15....2.76....7.51.647..1..2 | 976523184384197625152468793765219348491836257238745961519382476823674519647951832 | Basic 9x9 Sudoku 5252 | puzzles4_forum_hardest_1905 | 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.
| . . . . . 3 1 . .
3 . . 1 . . 6 2 .
. 5 . . 6 . . . 3
. . 5 . . . . 4 8
. 9 . 8 . . . . .
2 . . . 4 5 . . 1
5 . . . . 2 . 7 6
. . . . 7 . 5 1 .
6 4 7 . . 1 . . 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 976523184384197625152468793765219348491836257238745961519382476823674519647951832 #1 Extreme (9292)
Hidden Single: r4c3=5
Hidden Single: r8c8=1
Grouped Discontinuous Nice Loop: 8 r1c5 -8- r2c56 =8= r2c23 -8- r13c1 =8= r8c1 -8- r8c6 =8= r79c5 -8- r1c5 => r1c5<>8
Grouped Discontinuous Nice Loop: 8 r7c2 -8- r8... |
normal_sudoku_6160 | ..1.9...39.3.8...586.2...9...2...31.1...2..5..8.9....2219..45.6..8.529.175...923. | 421596783973481625865273194592648317146327859387915462219834576638752941754169238 | Basic 9x9 Sudoku 6160 | puzzles4_forum_hardest_1905 | 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.
| . . 1 . 9 . . . 3
9 . 3 . 8 . . . 5
8 6 . 2 . . . 9 .
. . 2 . . . 3 1 .
1 . . . 2 . . 5 .
. 8 . 9 . . . . 2
2 1 9 . . 4 5 . 6
. . 8 . 5 2 9 . 1
7 5 . . . 9 2 3 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 421596783973481625865273194592648317146327859387915462219834576638752941754169238 #1 Extreme (4078)
Naked Single: r7c3=9
Hidden Single: r7c7=5
Hidden Single: r7c1=2
Hidden Single: r8c7=9
Hidden Single: r3c4=2
Hidden Single: r6c4=9
Locked Candidates Type 1 (Pointing): 3 in b7 => r8c4<>3
Locked Ca... |
normal_sudoku_2449 | .2...378556.872.198..5.126.43...5...758..96..61.7......4.2.6...386...1..2.5.1..46 | 921643785564872319873591264432165978758429631619738452147286593386954127295317846 | Basic 9x9 Sudoku 2449 | puzzles1_unbiased | 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.
| . 2 . . . 3 7 8 5
5 6 . 8 7 2 . 1 9
8 . . 5 . 1 2 6 .
4 3 . . . 5 . . .
7 5 8 . . 9 6 . .
6 1 . 7 . . . . .
. 4 . 2 . 6 . . .
3 8 6 . . . 1 . .
2 . 5 . 1 . . 4 6 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 921643785564872319873591264432165978758429631619738452147286593386954127295317846 #1 Extreme (3008)
Hidden Single: r3c1=8
Hidden Single: r3c6=1
Hidden Single: r2c8=1
Naked Single: r2c1=5
Naked Single: r2c2=6
Naked Single: r5c1=7
Hidden Single: r5c2=5
Hidden Single: r8c3=6
Hidden Single: r9c9=... |
normal_sudoku_620 | .2.61..3...3.....1....37..4849276513256341897137..5......7.3....9...8.7.3.51..... | 524619738763824951918537624849276513256341897137985246482793165691458372375162489 | Basic 9x9 Sudoku 620 | puzzles1_unbiased | 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.
| . 2 . 6 1 . . 3 .
. . 3 . . . . . 1
. . . . 3 7 . . 4
8 4 9 2 7 6 5 1 3
2 5 6 3 4 1 8 9 7
1 3 7 . . 5 . . .
. . . 7 . 3 . . .
. 9 . . . 8 . 7 .
3 . 5 1 . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 524619738763824951918537624849276513256341897137985246482793165691458372375162489 #1 Easy (294)
Naked Single: r5c8=9
Naked Single: r5c6=1
Naked Single: r5c9=7
Full House: r5c2=5
Naked Single: r4c9=3
Naked Single: r4c2=4
Naked Single: r4c3=9
Full House: r4c5=7
Naked Single: r6c1=1
Full Hous... |
normal_sudoku_3670 | ..7..5....9........6..21..9.35.6.94778....56.6...5..388.65..794.73..96.595...6.83 | 317495826294678351568321479135862947789134562642957138826513794473289615951746283 | Basic 9x9 Sudoku 3670 | 01_file1 | 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.
| . . 7 . . 5 . . .
. 9 . . . . . . .
. 6 . . 2 1 . . 9
. 3 5 . 6 . 9 4 7
7 8 . . . . 5 6 .
6 . . . 5 . . 3 8
8 . 6 5 . . 7 9 4
. 7 3 . . 9 6 . 5
9 5 . . . 6 . 8 3 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 317495826294678351568321479135862947789134562642957138826513794473289615951746283 #1 Extreme (16606) bf
Hidden Single: r9c2=5
Hidden Single: r5c7=5
Hidden Single: r7c3=6
Hidden Single: r6c1=6
Hidden Single: r7c8=9
Hidden Single: r5c1=7
Hidden Single: r9c1=9
Naked Triple: 1,2,4 in r148c8 => r2c8<... |
normal_sudoku_2313 | 2.6.358.7..367..5.5.7..14368713.....6..1.7.48..9..617....56.78.9..7.....76..1...5 | 296435817143678952587921436871342569635197248429856173312569784954783621768214395 | Basic 9x9 Sudoku 2313 | puzzles1_unbiased | 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.
| 2 . 6 . 3 5 8 . 7
. . 3 6 7 . . 5 .
5 . 7 . . 1 4 3 6
8 7 1 3 . . . . .
6 . . 1 . 7 . 4 8
. . 9 . . 6 1 7 .
. . . 5 6 . 7 8 .
9 . . 7 . . . . .
7 6 . . 1 . . . 5 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 296435817143678952587921436871342569635197248429856173312569784954783621768214395 #1 Extreme (3066)
Naked Single: r3c1=5
Hidden Single: r3c8=3
Hidden Single: r4c2=7
Hidden Single: r1c3=6
Hidden Single: r5c1=6
Hidden Single: r5c4=1
Hidden Single: r1c6=5
Hidden Single: r1c9=7
Hidden Single: r3c... |
normal_sudoku_2663 | 8..5.6.1..65...4..1..9...5.3..8..59..5.6931.7.1..52...5....9..1..1..5.3..831....5 | 897546312265731489134928756326817594458693127719452863572389641641275938983164275 | Basic 9x9 Sudoku 2663 | puzzles4_forum_hardest_1905 | 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.
| 8 . . 5 . 6 . 1 .
. 6 5 . . . 4 . .
1 . . 9 . . . 5 .
3 . . 8 . . 5 9 .
. 5 . 6 9 3 1 . 7
. 1 . . 5 2 . . .
5 . . . . 9 . . 1
. . 1 . . 5 . 3 .
. 8 3 1 . . . . 5 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 897546312265731489134928756326817594458693127719452863572389641641275938983164275 #1 Extreme (40052) bf
Hidden Single: r2c3=5
Hidden Single: r5c5=9
Hidden Single: r8c6=5
Locked Candidates Type 1 (Pointing): 8 in b8 => r23c5<>8
Skyscraper: 9 in r2c9,r9c7 (connected by r29c1) => r1c7,r8c9<>9
Brute Force... |
normal_sudoku_3137 | .....8.....7.269...3.41758...61...29....6217.1..7..65...1.7.2..4....1..5.5...3... | 214958367587326941639417582376145829945862173128739654891574236463281795752693418 | Basic 9x9 Sudoku 3137 | puzzles4_forum_hardest_1905 | 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.
| . . . . . 8 . . .
. . 7 . 2 6 9 . .
. 3 . 4 1 7 5 8 .
. . 6 1 . . . 2 9
. . . . 6 2 1 7 .
1 . . 7 . . 6 5 .
. . 1 . 7 . 2 . .
4 . . . . 1 . . 5
. 5 . . . 3 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 214958367587326941639417582376145829945862173128739654891574236463281795752693418 #1 Extreme (31756) bf
Hidden Single: r3c6=7
Hidden Single: r8c6=1
Locked Candidates Type 1 (Pointing): 2 in b8 => r5c4<>2
Grouped Discontinuous Nice Loop: 9 r5c4 -9- r1c4 =9= r13c5 -9- r8c5 -8- r789c4 =8= r5c4 => r5c4<>9
Al... |
normal_sudoku_2649 | .1..7...4..5.197..7..8.....6..7...2..7.25613.5.......7.9.5.....1...679..........3 | 819672354235419786746835219681793425974256138523148697397524861158367942462981573 | Basic 9x9 Sudoku 2649 | puzzles4_forum_hardest_1905 | 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.
| . 1 . . 7 . . . 4
. . 5 . 1 9 7 . .
7 . . 8 . . . . .
6 . . 7 . . . 2 .
. 7 . 2 5 6 1 3 .
5 . . . . . . . 7
. 9 . 5 . . . . .
1 . . . 6 7 9 . .
. . . . . . . . 3 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 819672354235419786746835219681793425974256138523148697397524861158367942462981573 #1 Extreme (31116) bf
Forcing Net Contradiction in r3 => r3c8<>3
r3c8=3 (r3c8<>9) r3c8<>1 r3c9=1 (r3c9<>9) r3c9<>9 r3c3=9 (r1c3<>9 r1c8=9 r1c8<>5) r1c1<>9 r5c1=9 r5c9<>9 r4c9=9 r4c9<>5 r4c7=5 r1c7<>5 r1c6=5 r3c6<>5
r3c8=3 (r3c8<>9)... |
normal_sudoku_746 | .943...1.1....4938....19.4.96.1..4.2.15.4..934....35617415..3.9.394.1.5....93.1.4 | 694385217157624938328719645963157482815246793472893561741568329239471856586932174 | Basic 9x9 Sudoku 746 | puzzles4_forum_hardest_1905 | 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.
| . 9 4 3 . . . 1 .
1 . . . . 4 9 3 8
. . . . 1 9 . 4 .
9 6 . 1 . . 4 . 2
. 1 5 . 4 . . 9 3
4 . . . . 3 5 6 1
7 4 1 5 . . 3 . 9
. 3 9 4 . 1 . 5 .
. . . 9 3 . 1 . 4 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 694385217157624938328719645963157482815246793472893561741568329239471856586932174 #1 Medium (776)
Hidden Single: r2c7=9
Hidden Single: r2c1=1
Hidden Single: r4c7=4
Hidden Single: r7c2=4
Hidden Single: r8c4=4
Hidden Single: r9c7=1
Hidden Single: r6c9=1
Hidden Single: r7c9=9
Hidden Single: r4c4... |
normal_sudoku_2192 | .1..89....8.1.7....6.435....7..9..5.95....47.124573869.913..7.5.4.95213..3..18... | 312689547485127693769435218678294351953861472124573869291346785847952136536718924 | Basic 9x9 Sudoku 2192 | puzzles1_unbiased | 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.
| . 1 . . 8 9 . . .
. 8 . 1 . 7 . . .
. 6 . 4 3 5 . . .
. 7 . . 9 . . 5 .
9 5 . . . . 4 7 .
1 2 4 5 7 3 8 6 9
. 9 1 3 . . 7 . 5
. 4 . 9 5 2 1 3 .
. 3 . . 1 8 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 312689547485127693769435218678294351953861472124573869291346785847952136536718924 #1 Medium (416)
Naked Single: r6c2=2
Naked Single: r3c2=6
Full House: r9c2=3
Naked Single: r6c3=4
Naked Single: r6c9=9
Full House: r6c4=5
Hidden Single: r7c3=1
Hidden Single: r8c5=5
Hidden Single: r2c6=7
Hidd... |
normal_sudoku_138 | 2......87.7..8.6....8..9.1...35.8.9.5...67823.....35....419...8.9.83..4......4... | 235641987971382654648759312763528491519467823482913576324195768197836245856274139 | Basic 9x9 Sudoku 138 | puzzles4_forum_hardest_1905 | 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.
| 2 . . . . . . 8 7
. 7 . . 8 . 6 . .
. . 8 . . 9 . 1 .
. . 3 5 . 8 . 9 .
5 . . . 6 7 8 2 3
. . . . . 3 5 . .
. . 4 1 9 . . . 8
. 9 . 8 3 . . 4 .
. . . . . 4 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 235641987971382654648759312763528491519467823482913576324195768197836245856274139 #1 Extreme (30132) bf
Brute Force: r5c6=7
Locked Candidates Type 1 (Pointing): 1 in b5 => r1c5<>1
Locked Candidates Type 1 (Pointing): 7 in b8 => r9c1378<>7
Skyscraper: 7 in r7c8,r8c3 (connected by r6c38) => r7c1,r8c7<>7
Di... |
normal_sudoku_2569 | .438769.....2914.6.2.345..84.16.95.7...15764.7.54.2....5..24...3....8..4.9..1386. | 143876952578291436629345718431689527982157643765432189856924371317568294294713865 | Basic 9x9 Sudoku 2569 | puzzles1_unbiased | 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.
| . 4 3 8 7 6 9 . .
. . . 2 9 1 4 . 6
. 2 . 3 4 5 . . 8
4 . 1 6 . 9 5 . 7
. . . 1 5 7 6 4 .
7 . 5 4 . 2 . . .
. 5 . . 2 4 . . .
3 . . . . 8 . . 4
. 9 . . 1 3 8 6 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 143876952578291436629345718431689527982157643765432189856924371317568294294713865 #1 Easy (254)
Hidden Single: r3c5=4
Hidden Single: r5c6=7
Naked Single: r2c6=1
Naked Single: r1c6=6
Naked Single: r9c6=3
Full House: r4c6=9
Hidden Single: r4c1=4
Hidden Single: r6c3=5
Hidden Single: r1c4=8
Fu... |
normal_sudoku_3557 | .3.47..514.15.973....3.1.8424.6..19..7....8....9..5..3.5..1.4..6..25.3.......35.8 | 832476951461589732597321684245638197376192845189745263953817426618254379724963518 | Basic 9x9 Sudoku 3557 | puzzles4_forum_hardest_1905 | 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.
| . 3 . 4 7 . . 5 1
4 . 1 5 . 9 7 3 .
. . . 3 . 1 . 8 4
2 4 . 6 . . 1 9 .
. 7 . . . . 8 . .
. . 9 . . 5 . . 3
. 5 . . 1 . 4 . .
6 . . 2 5 . 3 . .
. . . . . 3 5 . 8 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 832476951461589732597321684245638197376192845189745263953817426618254379724963518 #1 Unfair (1700)
Hidden Single: r2c8=3
Hidden Single: r3c6=1
Hidden Single: r8c7=3
Hidden Single: r4c7=1
Hidden Single: r9c7=5
Hidden Single: r8c5=5
Hidden Single: r2c4=5
Locked Candidates Type 1 (Pointing): 4 in b... |
normal_sudoku_297 | .2..7.65..75.629.11..5.9.27.1..97582.926.517.75.....69.4....2......5..1..3....... | 924173658375862941186549327613497582492685173758231469847916235269358714531724896 | Basic 9x9 Sudoku 297 | 01_file1 | 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.
| . 2 . . 7 . 6 5 .
. 7 5 . 6 2 9 . 1
1 . . 5 . 9 . 2 7
. 1 . . 9 7 5 8 2
. 9 2 6 . 5 1 7 .
7 5 . . . . . 6 9
. 4 . . . . 2 . .
. . . . 5 . . 1 .
. 3 . . . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 924173658375862941186549327613497582492685173758231469847916235269358714531724896 #1 Extreme (3292)
Hidden Single: r2c2=7
Hidden Single: r5c8=7
Hidden Single: r6c9=9
Hidden Single: r3c8=2
Hidden Single: r3c4=5
Hidden Single: r5c6=5
Hidden Single: r4c2=1
Hidden Single: r4c9=2
Hidden Single: r4... |
normal_sudoku_3880 | .9....1..4....9..7..72...39..6.2.973.8.7.36.....9.6..1....9...5..3..2.96.5.6..... | 398574162421369587567281439146825973289713654735946821672198345813452796954637218 | Basic 9x9 Sudoku 3880 | puzzles4_forum_hardest_1905 | 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.
| . 9 . . . . 1 . .
4 . . . . 9 . . 7
. . 7 2 . . . 3 9
. . 6 . 2 . 9 7 3
. 8 . 7 . 3 6 . .
. . . 9 . 6 . . 1
. . . . 9 . . . 5
. . 3 . . 2 . 9 6
. 5 . 6 . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 398574162421369587567281439146825973289713654735946821672198345813452796954637218 #1 Extreme (20788) bf
Hidden Pair: 3,7 in r6c12 => r6c12<>2, r6c1<>5, r6c2<>4
Brute Force: r5c7=6
Hidden Single: r4c7=9
Hidden Single: r1c2=9
Locked Candidates Type 1 (Pointing): 8 in b6 => r6c5<>8
Discontinuous Nice Loo... |
normal_sudoku_3237 | 9.524867..27.9.8456......92....627.9.927..4687.64.952.2......54.7..24..6.....32.7 | 915248673327691845648357192854162739192735468736489521281976354573824916469513287 | Basic 9x9 Sudoku 3237 | 01_file1 | 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.
| 9 . 5 2 4 8 6 7 .
. 2 7 . 9 . 8 4 5
6 . . . . . . 9 2
. . . . 6 2 7 . 9
. 9 2 7 . . 4 6 8
7 . 6 4 . 9 5 2 .
2 . . . . . . 5 4
. 7 . . 2 4 . . 6
. . . . . 3 2 . 7 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 915248673327691845648357192854162739192735468736489521281976354573824916469513287 #1 Hard (1162)
Hidden Single: r1c1=9
Hidden Single: r5c8=6
Hidden Single: r4c9=9
Hidden Single: r5c3=2
Hidden Single: r3c9=2
Hidden Single: r8c5=2
Hidden Single: r1c8=7
Hidden Single: r6c8=2
Hidden Single: r2c9=... |
normal_sudoku_3437 | ..82...56...35.8.2....6813.74..2..1..816735......1....51..3628.8..5.23.1.2.18..65 | 138294756697351842452768139745829613981673524263415978514936287876542391329187465 | Basic 9x9 Sudoku 3437 | 01_file1 | 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.
| . . 8 2 . . . 5 6
. . . 3 5 . 8 . 2
. . . . 6 8 1 3 .
7 4 . . 2 . . 1 .
. 8 1 6 7 3 5 . .
. . . . 1 . . . .
5 1 . . 3 6 2 8 .
8 . . 5 . 2 3 . 1
. 2 . 1 8 . . 6 5 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 138294756697351842452768139745829613981673524263415978514936287876542391329187465 #1 Extreme (31594) bf
Hidden Single: r2c7=8
Hidden Single: r9c5=8
Hidden Single: r9c4=1
Hidden Single: r7c7=2
Hidden Single: r8c6=2
Hidden Single: r1c8=5
Hidden Single: r7c5=3
Hidden Single: r8c4=5
Naked Triple:... |
normal_sudoku_1505 | 6.9.4..155139...6....1.6......29....192.3.65.43..6.2.9986...1..2.1689..33.7.1.896 | 629348715513927468874156932768295341192834657435761289986573124241689573357412896 | Basic 9x9 Sudoku 1505 | puzzles1_unbiased | 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.
| 6 . 9 . 4 . . 1 5
5 1 3 9 . . . 6 .
. . . 1 . 6 . . .
. . . 2 9 . . . .
1 9 2 . 3 . 6 5 .
4 3 . . 6 . 2 . 9
9 8 6 . . . 1 . .
2 . 1 6 8 9 . . 3
3 . 7 . 1 . 8 9 6 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 629348715513927468874156932768295341192834657435761289986573124241689573357412896 #1 Easy (402)
Naked Single: r8c1=2
Naked Single: r9c1=3
Hidden Single: r5c2=9
Hidden Single: r3c6=6
Hidden Single: r1c8=1
Hidden Single: r9c5=1
Hidden Single: r8c3=1
Hidden Single: r6c9=9
Hidden Single: r8c6=9
... |
normal_sudoku_3899 | ..3..268.4.6...5...28..6..38..6...7..6547.....3...1456.8136...969.12...53....9.6. | 953712684476938521128546793814695372265473918739281456581367249697124835342859167 | Basic 9x9 Sudoku 3899 | puzzles4_forum_hardest_1905 | 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.
| . . 3 . . 2 6 8 .
4 . 6 . . . 5 . .
. 2 8 . . 6 . . 3
8 . . 6 . . . 7 .
. 6 5 4 7 . . . .
. 3 . . . 1 4 5 6
. 8 1 3 6 . . . 9
6 9 . 1 2 . . . 5
3 . . . . 9 . 6 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 953712684476938521128546793814695372265473918739281456581367249697124835342859167 #1 Unfair (1128)
Hidden Single: r1c7=6
Hidden Single: r3c3=8
Hidden Single: r4c4=6
Hidden Single: r6c8=5
Hidden Single: r8c1=6
Hidden Single: r9c8=6
Locked Candidates Type 1 (Pointing): 9 in b1 => r56c1<>9
Locked C... |
normal_sudoku_1695 | .9.1..832.5.283469.3.9..571.7.31.62..124.835..8.7.....32.69...5.6.527....4.83.... | 496175832157283469238946571574319628912468357683752914321694785869527143745831296 | Basic 9x9 Sudoku 1695 | puzzles1_unbiased | 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.
| . 9 . 1 . . 8 3 2
. 5 . 2 8 3 4 6 9
. 3 . 9 . . 5 7 1
. 7 . 3 1 . 6 2 .
. 1 2 4 . 8 3 5 .
. 8 . 7 . . . . .
3 2 . 6 9 . . . 5
. 6 . 5 2 7 . . .
. 4 . 8 3 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 496175832157283469238946571574319628912468357683752914321694785869527143745831296 #1 Easy (208)
Naked Single: r1c8=3
Naked Single: r5c2=1
Naked Single: r7c4=6
Naked Single: r8c4=5
Naked Single: r1c9=2
Naked Single: r2c9=9
Full House: r3c7=5
Naked Single: r6c2=8
Full House: r7c2=2
Naked Sin... |
normal_sudoku_2144 | .9341..27..7.....15.1..79...75..3...3168.42....9.5.3..138....4675264....964.387.2 | 893415627627389451541267983475923168316874295289156374138792546752641839964538712 | Basic 9x9 Sudoku 2144 | puzzles4_forum_hardest_1905 | 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.
| . 9 3 4 1 . . 2 7
. . 7 . . . . . 1
5 . 1 . . 7 9 . .
. 7 5 . . 3 . . .
3 1 6 8 . 4 2 . .
. . 9 . 5 . 3 . .
1 3 8 . . . . 4 6
7 5 2 6 4 . . . .
9 6 4 . 3 8 7 . 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 893415627627389451541267983475923168316874295289156374138792546752641839964538712 #1 Easy (282)
Naked Single: r5c2=1
Naked Single: r5c3=6
Hidden Single: r1c3=3
Hidden Single: r9c9=2
Hidden Single: r9c3=4
Hidden Single: r8c5=4
Hidden Single: r3c3=1
Hidden Single: r7c2=3
Hidden Single: r8c1=7
... |
normal_sudoku_5249 | 37...8.2..82.7...1..4...78..67.2..1.84...52.721......64.8.........9......26.8.1.. | 371658924982374561654291783567429318843165297219837456498712635135946872726583149 | Basic 9x9 Sudoku 5249 | puzzles4_forum_hardest_1905 | 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.
| 3 7 . . . 8 . 2 .
. 8 2 . 7 . . . 1
. . 4 . . . 7 8 .
. 6 7 . 2 . . 1 .
8 4 . . . 5 2 . 7
2 1 . . . . . . 6
4 . 8 . . . . . .
. . . 9 . . . . .
. 2 6 . 8 . 1 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 371658924982374561654291783567429318843165297219837456498712635135946872726583149 #1 Extreme (38926) bf
Hidden Single: r1c2=7
Hidden Single: r5c7=2
Hidden Single: r2c3=2
Discontinuous Nice Loop: 7 r8c6 -7- r6c6 =7= r6c4 =8= r6c7 -8- r8c7 =8= r8c9 =2= r8c6 => r8c6<>7
Forcing Net Contradiction in c1 => r3c... |
normal_sudoku_5719 | 46.15...22.16..5...5..24....7.2.165.18674592352..6...171.4.62.5.45.72...6.251.... | 467159382231687594859324716974231658186745923523968471718496235345872169692513847 | Basic 9x9 Sudoku 5719 | 01_file1 | 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.
| 4 6 . 1 5 . . . 2
2 . 1 6 . . 5 . .
. 5 . . 2 4 . . .
. 7 . 2 . 1 6 5 .
1 8 6 7 4 5 9 2 3
5 2 . . 6 . . . 1
7 1 . 4 . 6 2 . 5
. 4 5 . 7 2 . . .
6 . 2 5 1 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 467159382231687594859324716974231658186745923523968471718496235345872169692513847 #1 Extreme (24150) bf
Hidden Single: r1c5=5
Hidden Single: r5c1=1
Hidden Single: r4c8=5
Hidden Single: r5c3=6
Hidden Single: r7c6=6
Hidden Single: r8c3=5
Hidden Single: r4c6=1
Hidden Single: r9c4=5
Hidden Single... |
normal_sudoku_4486 | .1683..7553...7...8475.16..35.7.6.18.7815....6.14..75.78.....4..6..7..9...5.....7 | 916832475532647189847591623354726918278159364691483752789315246463278591125964837 | Basic 9x9 Sudoku 4486 | 01_file1 | 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.
| . 1 6 8 3 . . 7 5
5 3 . . . 7 . . .
8 4 7 5 . 1 6 . .
3 5 . 7 . 6 . 1 8
. 7 8 1 5 . . . .
6 . 1 4 . . 7 5 .
7 8 . . . . . 4 .
. 6 . . 7 . . 9 .
. . 5 . . . . . 7 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 916832475532647189847591623354726918278159364691483752789315246463278591125964837 #1 Extreme (12330) bf
Hidden Single: r1c3=6
Hidden Single: r6c3=1
Hidden Single: r9c9=7
Hidden Single: r2c1=5
Hidden Single: r6c8=5
Hidden Single: r5c3=8
Hidden Single: r3c4=5
Hidden Single: r4c2=5
Hidden Single... |
normal_sudoku_1409 | 74..9.3511....3.866.3..1..28....2..3.....781...7....2.5..12..3...1...2.5236..51.. | 742698351159243786683751942864912573925367814317584629598126437471839265236475198 | Basic 9x9 Sudoku 1409 | puzzles4_forum_hardest_1905 | 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.
| 7 4 . . 9 . 3 5 1
1 . . . . 3 . 8 6
6 . 3 . . 1 . . 2
8 . . . . 2 . . 3
. . . . . 7 8 1 .
. . 7 . . . . 2 .
5 . . 1 2 . . 3 .
. . 1 . . . 2 . 5
2 3 6 . . 5 1 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 742698351159243786683751942864912573925367814317584629598126437471839265236475198 #1 Extreme (23780) bf
Locked Candidates Type 1 (Pointing): 3 in b8 => r8c78<>3
Brute Force: r5c6=7
Finned Franken Swordfish: 7 c19b8 r189 fr7c9 => r8c78,r9c78<>7
Brute Force: r5c8=1
Locked Pair: 4,9 in r56c9 => r4c78,r6c7,r... |
normal_sudoku_1461 | ....19.46...4..2.3...2.391....6.1.922..397154.9..4236.8.5.2..3.....3.4...3.1...2. | 328719546619485273457263918743651892286397154591842367865924731172536489934178625 | Basic 9x9 Sudoku 1461 | 01_file1 | 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.
| . . . . 1 9 . 4 6
. . . 4 . . 2 . 3
. . . 2 . 3 9 1 .
. . . 6 . 1 . 9 2
2 . . 3 9 7 1 5 4
. 9 . . 4 2 3 6 .
8 . 5 . 2 . . 3 .
. . . . 3 . 4 . .
. 3 . 1 . . . 2 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 328719546619485273457263918743651892286397154591842367865924731172536489934178625 #1 Extreme (25768) bf
Hidden Single: r4c9=2
Hidden Single: r2c9=3
Hidden Single: r5c4=3
Hidden Single: r4c6=1
Hidden Single: r7c5=2
Hidden Single: r5c9=4
Hidden Single: r5c5=9
Brute Force: r5c6=7
Forcing Net Ver... |
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