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... |
normal_sudoku_1678 | 29.485....5.271..81..69325..13.29.......34.92.29..68....13625...3.957.....2148... | 297485316356271948148693257713829465685734192429516873971362584834957621562148739 | Basic 9x9 Sudoku 1678 | 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 9 . 4 8 5 . . .
. 5 . 2 7 1 . . 8
1 . . 6 9 3 2 5 .
. 1 3 . 2 9 . . .
. . . . 3 4 . 9 2
. 2 9 . . 6 8 . .
. . 1 3 6 2 5 . .
. 3 . 9 5 7 . . .
. . 2 1 4 8 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 297485316356271948148693257713829465685734192429516873971362584834957621562148739 #1 Hard (1134)
Naked Single: r3c5=9
Naked Single: r3c6=3
Naked Single: r2c6=1
Naked Single: r1c6=5
Full House: r1c4=4
Hidden Single: r5c9=2
Hidden Single: r1c1=2
Hidden Single: r6c3=9
Naked Single: r6c6=6
Nak... |
normal_sudoku_2710 | ..1746.327.2..3.4..43...6.72.9.5847.5371249864........32....19.6.....7.4......36. | 951746832762813549843295617219658473537124986486379251325467198698531724174982365 | Basic 9x9 Sudoku 2710 | 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 7 4 6 . 3 2
7 . 2 . . 3 . 4 .
. 4 3 . . . 6 . 7
2 . 9 . 5 8 4 7 .
5 3 7 1 2 4 9 8 6
4 . . . . . . . .
3 2 . . . . 1 9 .
6 . . . . . 7 . 4
. . . . . . 3 6 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 951746832762813549843295617219658473537124986486379251325467198698531724174982365 #1 Easy (364)
Naked Single: r5c1=5
Hidden Single: r1c4=7
Hidden Single: r3c3=3
Hidden Single: r4c1=2
Hidden Single: r2c8=4
Hidden Single: r1c8=3
Hidden Single: r8c7=7
Hidden Single: r3c7=6
Naked Single: r4c7=4
... |
normal_sudoku_134 | ..214...9..65.......49..18.745296831..3714...2.1385.4..18........9...7..437629518 | 852143679196578423374962185745296831983714256261385947618457392529831764437629518 | Basic 9x9 Sudoku 134 | 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 1 4 . . . 9
. . 6 5 . . . . .
. . 4 9 . . 1 8 .
7 4 5 2 9 6 8 3 1
. . 3 7 1 4 . . .
2 . 1 3 8 5 . 4 .
. 1 8 . . . . . .
. . 9 . . . 7 . .
4 3 7 6 2 9 5 1 8 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 852143679196578423374962185745296831983714256261385947618457392529831764437629518 #1 Easy (238)
Naked Single: r4c3=5
Naked Single: r6c3=1
Naked Single: r4c6=6
Naked Single: r9c1=4
Naked Single: r9c8=1
Full House: r9c9=8
Naked Single: r1c3=2
Full House: r3c3=4
Naked Single: r4c5=9
Full Hous... |
normal_sudoku_2806 | .6....34....5...2.2..4.36.1..6..21.882...543..1.9...7............387.....8...17.3 | 169287345348516927275493681936742158827165439514938276751329864693874512482651793 | Basic 9x9 Sudoku 2806 | 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 . . . . 3 4 .
. . . 5 . . . 2 .
2 . . 4 . 3 6 . 1
. . 6 . . 2 1 . 8
8 2 . . . 5 4 3 .
. 1 . 9 . . . 7 .
. . . . . . . . .
. . 3 8 7 . . . .
. 8 . . . 1 7 . 3 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 169287345348516927275493681936742158827165439514938276751329864693874512482651793 #1 Extreme (37976) bf
Locked Candidates Type 2 (Claiming): 2 in r8 => r7c789,r9c8<>2
Forcing Net Contradiction in r9 => r2c2<>7
r2c2=7 (r3c3<>7 r3c4=7 r4c4<>7 r4c1=7 r7c1<>7 r7c3=7 r7c3<>2) r2c2<>3 r2c1=3 r6c1<>3 r6c5=3 r7c5<>3 r7... |
normal_sudoku_2895 | 36....59....35...25.8.9..4.....1...4..183.9.56.57.9.1..5......6..6.8..791..96245. | 362478591794351682518296347983615724271834965645729813859147236426583179137962458 | Basic 9x9 Sudoku 2895 | 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 6 . . . . 5 9 .
. . . 3 5 . . . 2
5 . 8 . 9 . . 4 .
. . . . 1 . . . 4
. . 1 8 3 . 9 . 5
6 . 5 7 . 9 . 1 .
. 5 . . . . . . 6
. . 6 . 8 . . 7 9
1 . . 9 6 2 4 5 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 362478591794351682518296347983615724271834965645729813859147236426583179137962458 #1 Extreme (11916) bf
Brute Force: r5c5=3
Grouped Discontinuous Nice Loop: 2 r4c1 -2- r4c4 =2= r6c5 =4= r5c6 =6= r5c8 =2= r5c12 -2- r4c1 => r4c1<>2
Grouped Discontinuous Nice Loop: 2 r4c2 -2- r4c4 =2= r6c5 =4= r5c6 =6= r5c8 =2= r... |
normal_sudoku_3208 | 1..7.549..4.....75....4..1..2...4...5.382714.4...5..279.4.7.2.12..59.7.4.7.4.2.6. | 132785496649231875857649312721964583563827149498153627984376251216598734375412968 | Basic 9x9 Sudoku 3208 | 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 . 5 4 9 .
. 4 . . . . . 7 5
. . . . 4 . . 1 .
. 2 . . . 4 . . .
5 . 3 8 2 7 1 4 .
4 . . . 5 . . 2 7
9 . 4 . 7 . 2 . 1
2 . . 5 9 . 7 . 4
. 7 . 4 . 2 . 6 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 132785496649231875857649312721964583563827149498153627984376251216598734375412968 #1 Extreme (18836) bf
Hidden Single: r2c8=7
Hidden Single: r1c7=4
Hidden Single: r7c3=4
Locked Candidates Type 1 (Pointing): 2 in b3 => r5c9<>2
Hidden Pair: 4,7 in r45c6 => r4c6<>1, r4c6<>3, r45c6<>6, r45c6<>9
Discontinu... |
normal_sudoku_1982 | .26.75981.5..8.....8.9..4..27...9....49....12.632...9..3.8971..718546329.9.132.6. | 426375981951684273387921456275419638849763512163258794632897145718546329594132867 | Basic 9x9 Sudoku 1982 | 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 . 7 5 9 8 1
. 5 . . 8 . . . .
. 8 . 9 . . 4 . .
2 7 . . . 9 . . .
. 4 9 . . . . 1 2
. 6 3 2 . . . 9 .
. 3 . 8 9 7 1 . .
7 1 8 5 4 6 3 2 9
. 9 . 1 3 2 . 6 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 426375981951684273387921456275419638849763512163258794632897145718546329594132867 #1 Easy (314)
Naked Single: r8c2=1
Naked Single: r8c4=5
Naked Single: r4c2=7
Full House: r7c2=3
Naked Single: r8c8=2
Full House: r8c3=8
Naked Single: r9c5=3
Full House: r7c5=9
Naked Single: r1c5=7
Naked Singl... |
normal_sudoku_1331 | ...7.82.9.78..9..129..14...7691.3.28.84972.3..23..69....2.95...8..4.7592957..1.6. | 416738259378529641295614783769153428584972136123846975642395817831467592957281364 | Basic 9x9 Sudoku 1331 | 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 . 8 2 . 9
. 7 8 . . 9 . . 1
2 9 . . 1 4 . . .
7 6 9 1 . 3 . 2 8
. 8 4 9 7 2 . 3 .
. 2 3 . . 6 9 . .
. . 2 . 9 5 . . .
8 . . 4 . 7 5 9 2
9 5 7 . . 1 . 6 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 416738259378529641295614783769153428584972136123846975642395817831467592957281364 #1 Hard (454)
Naked Single: r5c6=2
Naked Single: r4c6=3
Naked Single: r2c6=9
Naked Single: r8c6=7
Full House: r1c6=8
Hidden Single: r4c3=9
Hidden Single: r9c1=9
Hidden Single: r8c8=9
Hidden Single: r4c8=2
Hid... |
normal_sudoku_825 | 2....9.3....2..9....9.4...6.....5.1.526391..731....5...4...7..86...8......89.4... | 261859734473216985859743126984675312526391847317428569142537698695182473738964251 | Basic 9x9 Sudoku 825 | 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 . . . . 9 . 3 .
. . . 2 . . 9 . .
. . 9 . 4 . . . 6
. . . . . 5 . 1 .
5 2 6 3 9 1 . . 7
3 1 . . . . 5 . .
. 4 . . . 7 . . 8
6 . . . 8 . . . .
. . 8 9 . 4 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 261859734473216985859743126984675312526391847317428569142537698695182473738964251 #1 Extreme (29834) bf
Hidden Single: r1c6=9
Locked Candidates Type 1 (Pointing): 9 in b4 => r4c9<>9
Brute Force: r5c4=3
Hidden Single: r5c6=1
Forcing Chain Contradiction in r7 => r6c3<>2
r6c3=2 r7c3<>2
r6c3=2 r6c6<>2 r8... |
normal_sudoku_291 | .942..65.85...62.92.6.5..48..8.75.2...2.348955..8......25...98.48.59..62......5.4 | 394218657857346219216957348948675123672134895531829476725463981483591762169782534 | Basic 9x9 Sudoku 291 | 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 4 2 . . 6 5 .
8 5 . . . 6 2 . 9
2 . 6 . 5 . . 4 8
. . 8 . 7 5 . 2 .
. . 2 . 3 4 8 9 5
5 . . 8 . . . . .
. 2 5 . . . 9 8 .
4 8 . 5 9 . . 6 2
. . . . . . 5 . 4 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 394218657857346219216957348948675123672134895531829476725463981483591762169782534 #1 Extreme (21688) bf
Hidden Single: r1c8=5
Hidden Single: r3c1=2
Hidden Single: r4c6=5
Hidden Single: r8c8=6
Hidden Single: r7c3=5
Hidden Single: r2c2=5
Hidden Single: r7c7=9
Hidden Pair: 2,8 in r9c56 => r9c56<>1,... |
normal_sudoku_2376 | 3728965149..45...71..372.8....64...56...1.....1.7.5.......8...2.61...4..238964751 | 372896514986451237145372689823649175657218943419735826594187362761523498238964751 | Basic 9x9 Sudoku 2376 | 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.
| 3 7 2 8 9 6 5 1 4
9 . . 4 5 . . . 7
1 . . 3 7 2 . 8 .
. . . 6 4 . . . 5
6 . . . 1 . . . .
. 1 . 7 . 5 . . .
. . . . 8 . . . 2
. 6 1 . . . 4 . .
2 3 8 9 6 4 7 5 1 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 372896514986451237145372689823649175657218943419735826594187362761523498238964751 #1 Easy (256)
Naked Single: r1c5=9
Naked Single: r9c5=6
Hidden Single: r3c5=7
Hidden Single: r3c1=1
Naked Single: r3c4=3
Hidden Single: r4c4=6
Hidden Single: r9c9=1
Naked Single: r9c4=9
Naked Single: r9c6=4
F... |
normal_sudoku_5286 | ..52....8.78..31..4.......3.83..2..9....65...5..3...1....72.......6..9.7.67..9.8. | 135276498278943165496581723683412579719865342542397816954728631821634957367159284 | Basic 9x9 Sudoku 5286 | 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 . . . . 8
. 7 8 . . 3 1 . .
4 . . . . . . . 3
. 8 3 . . 2 . . 9
. . . . 6 5 . . .
5 . . 3 . . . 1 .
. . . 7 2 . . . .
. . . 6 . . 9 . 7
. 6 7 . . 9 . 8 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 135276498278943165496581723683412579719865342542397816954728631821634957367159284 #1 Extreme (23848) bf
Brute Force: r5c6=5
Forcing Net Contradiction in r6 => r4c1<>1
r4c1=1 r4c1<>6 r6c3=6
r4c1=1 (r9c1<>1) (r5c1<>1) (r5c2<>1) r5c3<>1 r5c4=1 (r5c4<>8 r3c4=8 r3c5<>8) r5c4<>9 r6c5=9 r6c5<>8 r8c5=8 r8c5<>3 r9c5=3... |
normal_sudoku_5423 | ..2943..8186572.....3186.7..19..578.......9..6...9...4265.....7.31.67.5...425.6.. | 752943168186572349493186275319425786547638921628791534265314897931867452874259613 | Basic 9x9 Sudoku 5423 | 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 9 4 3 . . 8
1 8 6 5 7 2 . . .
. . 3 1 8 6 . 7 .
. 1 9 . . 5 7 8 .
. . . . . . 9 . .
6 . . . 9 . . . 4
2 6 5 . . . . . 7
. 3 1 . 6 7 . 5 .
. . 4 2 5 . 6 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 752943168186572349493186275319425786547638921628791534265314897931867452874259613 #1 Hard (1476)
Naked Single: r4c3=9
Naked Single: r2c3=6
Hidden Single: r7c2=6
Hidden Single: r7c3=5
Hidden Single: r8c3=1
Hidden Single: r7c9=7
Locked Candidates Type 1 (Pointing): 2 in b2 => r56c6<>2
Locked Candi... |
normal_sudoku_550 | ..9.8.6.......94...6352...9.....3.6...6.5.3..381.7.295175.4.9..234..58..69813.5.. | 429781653517369428863524179952813764746952381381476295175248936234695817698137542 | Basic 9x9 Sudoku 550 | 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 . 8 . 6 . .
. . . . . 9 4 . .
. 6 3 5 2 . . . 9
. . . . . 3 . 6 .
. . 6 . 5 . 3 . .
3 8 1 . 7 . 2 9 5
1 7 5 . 4 . 9 . .
2 3 4 . . 5 8 . .
6 9 8 1 3 . 5 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 429781653517369428863524179952813764746952381381476295175248936234695817698137542 #1 Extreme (2484)
Naked Single: r8c3=4
Naked Single: r8c2=3
Hidden Single: r9c1=6
Naked Single: r9c5=3
Hidden Single: r7c7=9
Hidden Single: r1c7=6
Hidden Single: r5c7=3
Hidden Single: r6c1=3
Locked Candidates Ty... |
normal_sudoku_1900 | 4..9...8...9..7..4......97.1.287.3.5.6..3.2.......281...1..4.5.2..5....8935768421 | 476953182319287564528641973192876345864135297753492816681324759247519638935768421 | Basic 9x9 Sudoku 1900 | 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 . . . 8 .
. . 9 . . 7 . . 4
. . . . . . 9 7 .
1 . 2 8 7 . 3 . 5
. 6 . . 3 . 2 . .
. . . . . 2 8 1 .
. . 1 . . 4 . 5 .
2 . . 5 . . . . 8
9 3 5 7 6 8 4 2 1 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 476953182319287564528641973192876345864135297753492816681324759247519638935768421 #1 Extreme (1920)
Naked Single: r9c8=2
Hidden Single: r9c3=5
Hidden Single: r9c6=8
Sue de Coq: r78c7 - {1367} (r4c7 - {36}, r9c9 - {17}) => r7c9<>7, r126c7<>3, r126c7<>6
Empty Rectangle: 6 in b3 (r6c49) => r2c4<>6
Turbot... |
normal_sudoku_375 | ..98...54.4...5.......943...7.5..4....4.8..25......6.719.2..54.42.95..6...5..8.92 | 769832154843165279251794386976521438314687925582349617198276543427953861635418792 | Basic 9x9 Sudoku 375 | 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 8 . . . 5 4
. 4 . . . 5 . . .
. . . . 9 4 3 . .
. 7 . 5 . . 4 . .
. . 4 . 8 . . 2 5
. . . . . . 6 . 7
1 9 . 2 . . 5 4 .
4 2 . 9 5 . . 6 .
. . 5 . . 8 . 9 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 769832154843165279251794386976521438314687925582349617198276543427953861635418792 #1 Extreme (3100)
Hidden Single: r4c7=4
Hidden Single: r2c6=5
Hidden Single: r8c1=4
Hidden Single: r7c7=5
Hidden Single: r7c2=9
Hidden Single: r2c2=4
Locked Candidates Type 1 (Pointing): 8 in b7 => r2346c3<>8
Locke... |
normal_sudoku_1071 | 5...8...9..1..2....9.5.3...81.2.......5.71..876.....4..5..6...71......3...7..94.. | 534687129671492583298513674813246795425971368769835241952364817146758932387129456 | Basic 9x9 Sudoku 1071 | 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 . . . 8 . . . 9
. . 1 . . 2 . . .
. 9 . 5 . 3 . . .
8 1 . 2 . . . . .
. . 5 . 7 1 . . 8
7 6 . . . . . 4 .
. 5 . . 6 . . . 7
1 . . . . . . 3 .
. . 7 . . 9 4 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 534687129671492583298513674813246795425971368769835241952364817146758932387129456 #1 Extreme (27540) bf
Finned X-Wing: 7 r36 c17 fr3c8 => r12c7<>7
Brute Force: r5c6=1
Hidden Single: r4c2=1
Hidden Single: r6c1=7
Locked Candidates Type 2 (Claiming): 7 in r3 => r12c8<>7
2-String Kite: 9 in r5c1,r8c7 (con... |
normal_sudoku_1383 | ..13...9.2459761..7.9841.52..7...8......879..18...9.4735819......263.5.16147....9 | 861325794245976138739841652497213865526487913183569247358192476972634581614758329 | Basic 9x9 Sudoku 1383 | 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 3 . . . 9 .
2 4 5 9 7 6 1 . .
7 . 9 8 4 1 . 5 2
. . 7 . . . 8 . .
. . . . 8 7 9 . .
1 8 . . . 9 . 4 7
3 5 8 1 9 . . . .
. . 2 6 3 . 5 . 1
6 1 4 7 . . . . 9 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 861325794245976138739841652497213865526487913183569247358192476972634581614758329 #1 Easy (264)
Naked Single: r3c4=8
Naked Single: r9c2=1
Naked Single: r9c3=4
Hidden Single: r6c2=8
Hidden Single: r7c4=1
Hidden Single: r2c7=1
Hidden Single: r5c6=7
Naked Single: r2c6=6
Naked Single: r2c5=7
H... |
normal_sudoku_6311 | .3..16.7..6.7..53......8..165.8.1..3.1.6..745..2...1....6...41......9....8.16...7 | 835216974261794538794538621657841293918623745342975186526387419173459862489162357 | Basic 9x9 Sudoku 6311 | 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 6 . 7 .
. 6 . 7 . . 5 3 .
. . . . . 8 . . 1
6 5 . 8 . 1 . . 3
. 1 . 6 . . 7 4 5
. . 2 . . . 1 . .
. . 6 . . . 4 1 .
. . . . . 9 . . .
. 8 . 1 6 . . . 7 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 835216974261794538794538621657841293918623745342975186526387419173459862489162357 #1 Extreme (14994) bf
Hidden Single: r6c7=1
Brute Force: r5c8=4
Locked Pair: 2,9 in r4c78 => r4c35,r6c89<>9, r4c5<>2
Locked Candidates Type 1 (Pointing): 8 in b6 => r6c1<>8
Uniqueness Test 2: 2/9 in r3c78,r4c78 => r1c79,r2c... |
normal_sudoku_2398 | ..856.4.2...2....12...1.5......56.28..517264..2.84...5...78..5.9.362581....4....6 | 318567492459238761276914583794356128835172649621849375162783954943625817587491236 | Basic 9x9 Sudoku 2398 | 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 5 6 . 4 . 2
. . . 2 . . . . 1
2 . . . 1 . 5 . .
. . . . 5 6 . 2 8
. . 5 1 7 2 6 4 .
. 2 . 8 4 . . . 5
. . . 7 8 . . 5 .
9 . 3 6 2 5 8 1 .
. . . 4 . . . . 6 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 318567492459238761276914583794356128835172649621849375162783954943625817587491236 #1 Extreme (22094) bf
Hidden Single: r6c9=5
Hidden Single: r8c5=2
Hidden Single: r5c8=4
Hidden Single: r2c4=2
Hidden Single: r1c4=5
Naked Triple: 3,7,9 in r1c6,r2c5,r3c4 => r23c6<>3, r23c6<>7, r23c6<>9
Naked Triple: 3... |
normal_sudoku_218 | .46..3.9...9.286....8.64...4.1..69...67.5.4..8.3....76185432769..46.7.52672..53.. | 546173298319528647728964135451786923267359481893241576185432769934617852672895314 | Basic 9x9 Sudoku 218 | 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 6 . . 3 . 9 .
. . 9 . 2 8 6 . .
. . 8 . 6 4 . . .
4 . 1 . . 6 9 . .
. 6 7 . 5 . 4 . .
8 . 3 . . . . 7 6
1 8 5 4 3 2 7 6 9
. . 4 6 . 7 . 5 2
6 7 2 . . 5 3 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 546173298319528647728964135451786923267359481893241576185432769934617852672895314 #1 Unfair (1196)
Naked Single: r7c3=5
Naked Single: r6c3=3
Naked Single: r7c1=1
Naked Single: r5c3=7
Full House: r1c3=6
Naked Single: r7c2=8
Naked Single: r7c7=7
Naked Single: r7c6=2
Naked Single: r7c4=4
Full... |
normal_sudoku_3305 | .3...9..55.....2...965.....9.8...4..4532189766..9.4........78......4..1.3..6....2 | 132479685547186293896523147928765431453218976671934528219357864765842319384691752 | Basic 9x9 Sudoku 3305 | 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 . . . 9 . . 5
5 . . . . . 2 . .
. 9 6 5 . . . . .
9 . 8 . . . 4 . .
4 5 3 2 1 8 9 7 6
6 . . 9 . 4 . . .
. . . . . 7 8 . .
. . . . 4 . . 1 .
3 . . 6 . . . . 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 132479685547186293896523147928765431453218976671934528219357864765842319384691752 #1 Extreme (37916) bf
Locked Candidates Type 1 (Pointing): 6 in b5 => r4c89<>6
Brute Force: r5c4=2
Hidden Single: r6c6=4
Discontinuous Nice Loop: 5 r9c2 -5- r9c6 -1- r7c4 -3- r8c4 -8- r9c5 =8= r9c2 => r9c2<>5
Brute Force: r... |
normal_sudoku_4685 | .3.9...8676.3.......165.3....9..56..62...3.7.4....6..8..653.9......6...2.4..19.6. | 532941786764382159891657324179825643628493571453176298286534917915768432347219865 | Basic 9x9 Sudoku 4685 | 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 . 9 . . . 8 6
7 6 . 3 . . . . .
. . 1 6 5 . 3 . .
. . 9 . . 5 6 . .
6 2 . . . 3 . 7 .
4 . . . . 6 . . 8
. . 6 5 3 . 9 . .
. . . . 6 . . . 2
. 4 . . 1 9 . 6 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 532941786764382159891657324179825643628493571453176298286534917915768432347219865 #1 Extreme (17650) bf
Hidden Single: r9c8=6
Locked Candidates Type 1 (Pointing): 1 in b2 => r56c6<>1
2-String Kite: 6 in r2c6,r5c1 (connected by r2c2,r3c1) => r5c6<>6
Brute Force: r5c6=3
Hidden Single: r7c5=3
2-String Ki... |
normal_sudoku_5241 | 751..468.8..15.9..2.3...5..614537.9.5......3737.....654.76.5...1..4.8.59985.1..46 | 751924683846153972293786514614537298529861437378249165437695821162478359985312746 | Basic 9x9 Sudoku 5241 | 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 1 . . 4 6 8 .
8 . . 1 5 . 9 . .
2 . 3 . . . 5 . .
6 1 4 5 3 7 . 9 .
5 . . . . . . 3 7
3 7 . . . . . 6 5
4 . 7 6 . 5 . . .
1 . . 4 . 8 . 5 9
9 8 5 . 1 . . 4 6 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 751924683846153972293786514614537298529861437378249165437695821162478359985312746 #1 Easy (298)
Hidden Single: r4c5=3
Hidden Single: r6c2=7
Hidden Single: r2c5=5
Hidden Single: r1c3=1
Hidden Single: r6c9=5
Hidden Single: r9c3=5
Hidden Single: r6c8=6
Hidden Single: r9c9=6
Naked Single: r9c1=9
... |
normal_sudoku_169 | 8.......66.....32.1.45...8.49.......7.349...5561278.3.91785264334..1.2..2..643.9. | 872934516659187324134526987498365172723491865561278439917852643346719258285643791 | Basic 9x9 Sudoku 169 | 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 . . . . . . . 6
6 . . . . . 3 2 .
1 . 4 5 . . . 8 .
4 9 . . . . . . .
7 . 3 4 9 . . . 5
5 6 1 2 7 8 . 3 .
9 1 7 8 5 2 6 4 3
3 4 . . 1 . 2 . .
2 . . 6 4 3 . 9 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 872934516659187324134526987498365172723491865561278439917852643346719258285643791 #1 Easy (252)
Naked Single: r7c1=9
Naked Single: r7c4=8
Naked Single: r7c2=1
Full House: r7c8=4
Naked Single: r9c5=4
Naked Single: r6c8=3
Naked Single: r6c4=2
Naked Single: r6c1=5
Naked Single: r6c6=8
Naked S... |
normal_sudoku_2615 | 413895...78..62...56..7....658.1.3..324.8.1.997142..5..4....98529..5..1.83....7.. | 413895267789162534562374891658719342324586179971423658146237985297658413835941726 | Basic 9x9 Sudoku 2615 | 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 1 3 8 9 5 . . .
7 8 . . 6 2 . . .
5 6 . . 7 . . . .
6 5 8 . 1 . 3 . .
3 2 4 . 8 . 1 . 9
9 7 1 4 2 . . 5 .
. 4 . . . . 9 8 5
2 9 . . 5 . . 1 .
8 3 . . . . 7 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 413895267789162534562374891658719342324586179971423658146237985297658413835941726 #1 Easy (222)
Naked Single: r6c2=7
Naked Single: r4c2=5
Naked Single: r1c2=1
Naked Single: r5c1=3
Full House: r6c1=9
Naked Single: r1c5=9
Naked Single: r2c2=8
Full House: r7c2=4
Naked Single: r5c5=8
Naked Sin... |
normal_sudoku_907 | 65....2.3..4..3..1132.8.7..3.18...7..6.39.12.4....1.36.1..38.9.5.3.7.....4...53.7 | 657149283984723651132586749321864975865397124479251836716438592593672418248915367 | Basic 9x9 Sudoku 907 | 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 5 . . . . 2 . 3
. . 4 . . 3 . . 1
1 3 2 . 8 . 7 . .
3 . 1 8 . . . 7 .
. 6 . 3 9 . 1 2 .
4 . . . . 1 . 3 6
. 1 . . 3 8 . 9 .
5 . 3 . 7 . . . .
. 4 . . . 5 3 . 7 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 657149283984723651132586749321864975865397124479251836716438592593672418248915367 #1 Extreme (13166) bf
Brute Force: r5c4=3
Hidden Single: r7c5=3
Hidden Single: r8c3=3
Hidden Single: r4c1=3
Hidden Single: r6c8=3
Hidden Single: r1c9=3
Locked Candidates Type 2 (Claiming): 5 in c8 => r2c7,r3c9<>5
C... |
normal_sudoku_284 | 15.6.7..276...45.124.5197....1348.9...4..5....3..614....6.73..44..1.6....174.2.5. | 158637942769824531243519768671348295824795316935261487586973124492156873317482659 | Basic 9x9 Sudoku 284 | 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 5 . 6 . 7 . . 2
7 6 . . . 4 5 . 1
2 4 . 5 1 9 7 . .
. . 1 3 4 8 . 9 .
. . 4 . . 5 . . .
. 3 . . 6 1 4 . .
. . 6 . 7 3 . . 4
4 . . 1 . 6 . . .
. 1 7 4 . 2 . 5 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 158637942769824531243519768671348295824795316935261487586973124492156873317482659 #1 Easy (400)
Naked Single: r3c6=9
Hidden Single: r1c1=1
Hidden Single: r3c5=1
Hidden Single: r4c5=4
Hidden Single: r5c3=4
Hidden Single: r7c9=4
Hidden Single: r8c6=6
Hidden Single: r2c7=5
Hidden Single: r1c6=7
... |
normal_sudoku_466 | .6...5..3..83...1.3..7..4..2.7.5.....8.237..6....482..5..8..7....1.7..9..7...3..1 | 462185973798324615315796482237651849984237156156948237523819764641572398879463521 | Basic 9x9 Sudoku 466 | 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 . . . 5 . . 3
. . 8 3 . . . 1 .
3 . . 7 . . 4 . .
2 . 7 . 5 . . . .
. 8 . 2 3 7 . . 6
. . . . 4 8 2 . .
5 . . 8 . . 7 . .
. . 1 . 7 . . 9 .
. 7 . . . 3 . . 1 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 462185973798324615315796482237651849984237156156948237523819764641572398879463521 #1 Extreme (31274) bf
Locked Candidates Type 1 (Pointing): 6 in b4 => r6c4<>6
Locked Candidates Type 1 (Pointing): 7 in b5 => r5c8<>7
Brute Force: r5c6=7
Hidden Single: r8c5=7
Brute Force: r5c5=3
Hidden Single: r2c4=3
... |
normal_sudoku_436 | ...6.9..1.19.2367.....1.3..26.5.....958364712.7.29.5.6.9..3.257735..2.6.82.....43 | 387659421519423678642718395261587934958364712473291586194836257735142869826975143 | Basic 9x9 Sudoku 436 | 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 . 9 . . 1
. 1 9 . 2 3 6 7 .
. . . . 1 . 3 . .
2 6 . 5 . . . . .
9 5 8 3 6 4 7 1 2
. 7 . 2 9 . 5 . 6
. 9 . . 3 . 2 5 7
7 3 5 . . 2 . 6 .
8 2 . . . . . 4 3 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 387659421519423678642718395261587934958364712473291586194836257735142869826975143 #1 Medium (534)
Naked Single: r5c2=5
Naked Single: r9c2=2
Naked Single: r5c9=2
Hidden Single: r5c5=6
Hidden Single: r7c8=5
Hidden Single: r6c4=2
Hidden Single: r8c8=6
Hidden Single: r7c7=2
Hidden Single: r2c5=2
... |
normal_sudoku_2243 | 8493..526.2.49.173.1....498...1..3656.1..9842...6.4917......6.4.....6..9..39....1 | 849371526526498173317265498984127365671539842235684917792813654158746239463952781 | Basic 9x9 Sudoku 2243 | 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 4 9 3 . . 5 2 6
. 2 . 4 9 . 1 7 3
. 1 . . . . 4 9 8
. . . 1 . . 3 6 5
6 . 1 . . 9 8 4 2
. . . 6 . 4 9 1 7
. . . . . . 6 . 4
. . . . . 6 . . 9
. . 3 9 . . . . 1 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 849371526526498173317265498984127365671539842235684917792813654158746239463952781 #1 Hard (608)
Naked Single: r5c9=2
Naked Single: r9c9=1
Naked Single: r1c9=6
Naked Single: r2c9=3
Full House: r8c9=9
Hidden Single: r2c5=9
Hidden Single: r4c8=6
Hidden Single: r6c7=9
Hidden Single: r1c2=4
Hid... |
normal_sudoku_5100 | 45..36.8.8...52..6..684.5......95...6..217.5...5.83..12..5...385..3...6...4...7.5 | 451736982837952416926841573182695347643217859795483621279564138518379264364128795 | Basic 9x9 Sudoku 5100 | 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 5 . . 3 6 . 8 .
8 . . . 5 2 . . 6
. . 6 8 4 . 5 . .
. . . . 9 5 . . .
6 . . 2 1 7 . 5 .
. . 5 . 8 3 . . 1
2 . . 5 . . . 3 8
5 . . 3 . . . 6 .
. . 4 . . . 7 . 5 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 451736982837952416926841573182695347643217859795483621279564138518379264364128795 #1 Extreme (24776) bf
Hidden Single: r2c5=5
Hidden Single: r4c6=5
Hidden Single: r8c1=5
Brute Force: r5c6=7
Hidden Single: r6c6=3
Locked Candidates Type 1 (Pointing): 8 in b5 => r89c5<>8
Locked Candidates Type 1 (Poin... |
normal_sudoku_1338 | ..69318.58.5.6..9339...5..7..3..9..665..1.7.99......3156927431823..9...4.8..5.9.2 | 476931825825467193391825467713549286658312749942786531569274318237198654184653972 | Basic 9x9 Sudoku 1338 | 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 9 3 1 8 . 5
8 . 5 . 6 . . 9 3
3 9 . . . 5 . . 7
. . 3 . . 9 . . 6
6 5 . . 1 . 7 . 9
9 . . . . . . 3 1
5 6 9 2 7 4 3 1 8
2 3 . . 9 . . . 4
. 8 . . 5 . 9 . 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 476931825825467193391825467713549286658312749942786531569274318237198654184653972 #1 Extreme (1944)
Naked Single: r1c9=5
Hidden Single: r8c2=3
Hidden Single: r4c9=6
Hidden Single: r7c1=5
Naked Single: r7c7=3
Naked Single: r7c9=8
Naked Single: r5c9=9
Full House: r2c9=3
Naked Single: r7c5=7
... |
normal_sudoku_175 | ...87..5.78..9..3..4961.287..17..892..7..831.8..9.174..2.187.6..7.349.28..85..47. | 612873954785294631349615287451736892297458316863921745924187563576349128138562479 | Basic 9x9 Sudoku 175 | 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 . . 5 .
7 8 . . 9 . . 3 .
. 4 9 6 1 . 2 8 7
. . 1 7 . . 8 9 2
. . 7 . . 8 3 1 .
8 . . 9 . 1 7 4 .
. 2 . 1 8 7 . 6 .
. 7 . 3 4 9 . 2 8
. . 8 5 . . 4 7 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 612873954785294631349615287451736892297458316863921745924187563576349128138562479 #1 Hard (1006)
Naked Single: r8c8=2
Naked Single: r7c6=7
Hidden Single: r2c5=9
Naked Single: r2c8=3
Naked Single: r3c8=8
Full House: r4c8=9
Hidden Single: r1c4=8
Naked Single: r7c4=1
Naked Single: r7c5=8
Hidd... |
normal_sudoku_2223 | ....6....8..4.2..6...7.82...9.2...3.4...856....8....52.1.5.......3..9..12...4.7.. | 342961587857432916169758243695217834421385679738694152914576328573829461286143795 | Basic 9x9 Sudoku 2223 | 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 . . . .
8 . . 4 . 2 . . 6
. . . 7 . 8 2 . .
. 9 . 2 . . . 3 .
4 . . . 8 5 6 . .
. . 8 . . . . 5 2
. 1 . 5 . . . . .
. . 3 . . 9 . . 1
2 . . . 4 . 7 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 342961587857432916169758243695217834421385679738694152914576328573829461286143795 #1 Extreme (28008) bf
Locked Candidates Type 2 (Claiming): 8 in r7 => r8c78,r9c89<>8
Hidden Rectangle: 6/8 in r8c24,r9c24 => r9c2<>6
Forcing Net Contradiction in c4 => r6c6<>3
r6c6=3 (r5c4<>3) (r6c6<>6) r6c6<>4 r6c7=4 (r6c7<>9)... |
normal_sudoku_3412 | 14...65....34....17......426....1..9.1..62......58.1.62......7..9...56..4..6..2.3 | 142376598583429761769158342625741839318962457974583126236814975897235614451697283 | Basic 9x9 Sudoku 3412 | 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 4 . . . 6 5 . .
. . 3 4 . . . . 1
7 . . . . . . 4 2
6 . . . . 1 . . 9
. 1 . . 6 2 . . .
. . . 5 8 . 1 . 6
2 . . . . . . 7 .
. 9 . . . 5 6 . .
4 . . 6 . . 2 . 3 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 142376598583429761769158342625741839318962457974583126236814975897235614451697283 #1 Extreme (22764) bf
Locked Candidates Type 1 (Pointing): 1 in b3 => r2c5<>1
Locked Candidates Type 1 (Pointing): 6 in b3 => r2c12<>6
Locked Candidates Type 2 (Claiming): 6 in c1 => r4c23,r6c23<>6
Hidden Pair: 1,6 in r2c89 =>... |
normal_sudoku_941 | 3.5.24....2163.....6.5.1.3...61438.9..32.7....4...63..61.3.2..4.34.15...5.246.1.3 | 385724916421639785967581432276143859853297641149856327618372594734915268592468173 | Basic 9x9 Sudoku 941 | 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 . 5 . 2 4 . . .
. 2 1 6 3 . . . .
. 6 . 5 . 1 . 3 .
. . 6 1 4 3 8 . 9
. . 3 2 . 7 . . .
. 4 . . . 6 3 . .
6 1 . 3 . 2 . . 4
. 3 4 . 1 5 . . .
5 . 2 4 6 . 1 . 3 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 385724916421639785967581432276143859853297641149856327618372594734915268592468173 #1 Extreme (15984) bf
Hidden Single: r2c5=3
Hidden Single: r4c3=6
Hidden Single: r9c4=4
Hidden Single: r3c6=1
Hidden Single: r9c5=6
Hidden Single: r7c6=2
Hidden Single: r7c2=1
Hidden Single: r6c7=3
Hidden Single... |
normal_sudoku_3737 | ..6....29.3.62.48.2.49.83.6...4.68.26.289.134.4831269...72....8..1......4...8..6. | 786143529935627481214958376193476852672895134548312697357264918861739245429581763 | Basic 9x9 Sudoku 3737 | 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.
| . . 6 . . . . 2 9
. 3 . 6 2 . 4 8 .
2 . 4 9 . 8 3 . 6
. . . 4 . 6 8 . 2
6 . 2 8 9 . 1 3 4
. 4 8 3 1 2 6 9 .
. . 7 2 . . . . 8
. . 1 . . . . . .
4 . . . 8 . . 6 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 786143529935627481214958376193476852672895134548312697357264918861739245429581763 #1 Extreme (21368) bf
Hidden Single: r5c9=4
Hidden Single: r5c4=8
Hidden Single: r2c5=2
Hidden Single: r4c9=2
Hidden Single: r2c8=8
Hidden Single: r1c3=6
Hidden Single: r6c7=6
Hidden Single: r3c9=6
Discontinuous... |
normal_sudoku_2011 | 3.2..918...917.62...12....5.95.3..1...4.......23.1..69546..1392937...851..8.9.746 | 372569184459178623681243975895632417164957238723814569546781392937426851218395746 | Basic 9x9 Sudoku 2011 | 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.
| 3 . 2 . . 9 1 8 .
. . 9 1 7 . 6 2 .
. . 1 2 . . . . 5
. 9 5 . 3 . . 1 .
. . 4 . . . . . .
. 2 3 . 1 . . 6 9
5 4 6 . . 1 3 9 2
9 3 7 . . . 8 5 1
. . 8 . 9 . 7 4 6 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 372569184459178623681243975895632417164957238723814569546781392937426851218395746 #1 Hard (870)
Naked Single: r8c8=5
Naked Single: r8c7=8
Naked Single: r9c7=7
Naked Single: r7c8=9
Hidden Single: r2c4=1
Hidden Single: r6c3=3
Hidden Single: r1c3=2
Hidden Single: r2c8=2
Hidden Single: r2c3=9
... |
normal_sudoku_2971 | ....3.8.131..8.4..82..9.3.517.6.35.85.3..891...8.51637...3..1...514..783.348..2.9 | 497536821315287496826194375179623548563748912248951637682379154951462783734815269 | Basic 9x9 Sudoku 2971 | 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.
| . . . . 3 . 8 . 1
3 1 . . 8 . 4 . .
8 2 . . 9 . 3 . 5
1 7 . 6 . 3 5 . 8
5 . 3 . . 8 9 1 .
. . 8 . 5 1 6 3 7
. . . 3 . . 1 . .
. 5 1 4 . . 7 8 3
. 3 4 8 . . 2 . 9 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 497536821315287496826194375179623548563748912248951637682379154951462783734815269 #1 Hard (628)
Naked Single: r5c7=9
Naked Single: r1c7=8
Full House: r4c7=5
Hidden Single: r1c5=3
Hidden Single: r5c8=1
Hidden Single: r9c4=8
Hidden Single: r3c1=8
Hidden Single: r4c9=8
Hidden Single: r6c8=3
H... |
normal_sudoku_3575 | ..9..1..6.6....1..1.4....7.721...369983..2451..69138276..13.78....8.6.15.1..576.3 | 879321546265794138134568972721485369983672451546913827652139784397846215418257693 | Basic 9x9 Sudoku 3575 | 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 . . 1 . . 6
. 6 . . . . 1 . .
1 . 4 . . . . 7 .
7 2 1 . . . 3 6 9
9 8 3 . . 2 4 5 1
. . 6 9 1 3 8 2 7
6 . . 1 3 . 7 8 .
. . . 8 . 6 . 1 5
. 1 . . 5 7 6 . 3 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 879321546265794138134568972721485369983672451546913827652139784397846215418257693 #1 Easy (318)
Hidden Single: r5c1=9
Hidden Single: r4c3=1
Hidden Single: r6c9=7
Hidden Single: r6c3=6
Hidden Single: r9c7=6
Hidden Single: r3c1=1
Hidden Single: r7c4=1
Hidden Single: r8c8=1
Hidden Single: r4c7=3... |
normal_sudoku_2575 | .79..841558...12...1..5..8..256.41.8..8.157421..82.65.851..6.2....5..8.1...1825.. | 679238415584961237213457986325674198968315742147829653851796324792543861436182579 | Basic 9x9 Sudoku 2575 | 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 4 1 5
5 8 . . . 1 2 . .
. 1 . . 5 . . 8 .
. 2 5 6 . 4 1 . 8
. . 8 . 1 5 7 4 2
1 . . 8 2 . 6 5 .
8 5 1 . . 6 . 2 .
. . . 5 . . 8 . 1
. . . 1 8 2 5 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 679238415584961237213457986325674198968315742147829653851796324792543861436182579 #1 Extreme (15986) bf
Hidden Single: r4c9=8
Hidden Single: r2c2=8
Hidden Single: r9c7=5
Hidden Single: r6c5=2
Hidden Single: r7c8=2
Hidden Single: r9c5=8
Hidden Single: r1c6=8
Hidden Single: r3c2=1
Hidden Single... |
normal_sudoku_2942 | ...836279367912...8..745361.13..4.9.....5.7......8........98.272.....9.59.4....36 | 145836279367912854892745361613274598428659713759381642536198427271463985984527136 | Basic 9x9 Sudoku 2942 | 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 3 6 2 7 9
3 6 7 9 1 2 . . .
8 . . 7 4 5 3 6 1
. 1 3 . . 4 . 9 .
. . . . 5 . 7 . .
. . . . 8 . . . .
. . . . 9 8 . 2 7
2 . . . . . 9 . 5
9 . 4 . . . . 3 6 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 145836279367912854892745361613274598428659713759381642536198427271463985984527136 #1 Extreme (1818)
Hidden Single: r2c3=7
Hidden Single: r3c7=3
Naked Single: r3c5=4
Naked Single: r2c5=1
Naked Single: r1c5=3
Hidden Single: r7c9=7
Hidden Single: r2c4=9
Naked Single: r3c6=5
Full House: r1c4=8
... |
normal_sudoku_3684 | 8...56..7..23..86.67...2513..9.23......6......6..49.3...62...4..2..61..81...3.... | 893156427512374869674982513489523176235617984761849235356298741927461358148735692 | Basic 9x9 Sudoku 3684 | 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 . . 7
. . 2 3 . . 8 6 .
6 7 . . . 2 5 1 3
. . 9 . 2 3 . . .
. . . 6 . . . . .
. 6 . . 4 9 . 3 .
. . 6 2 . . . 4 .
. 2 . . 6 1 . . 8
1 . . . 3 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 893156427512374869674982513489523176235617984761849235356298741927461358148735692 #1 Extreme (14446)
Hidden Single: r1c6=6
Hidden Single: r3c1=6
Hidden Single: r2c7=8
Hidden Single: r3c6=2
Almost Locked Set XY-Wing: A=r13c3 {134}, B=r579c6 {4578}, C=r2c1269 {14579}, X,Y=1,7, Z=4 => r9c3<>4
Forcing Net... |
normal_sudoku_3464 | 9.3.74...48.9.63...7638...9..746.....9...3.4..34.982.5.4.6.95....9.476.8.6.8...94 | 953274861481956372276381459127465983598123746634798215842619537319547628765832194 | Basic 9x9 Sudoku 3464 | 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 . 3 . 7 4 . . .
4 8 . 9 . 6 3 . .
. 7 6 3 8 . . . 9
. . 7 4 6 . . . .
. 9 . . . 3 . 4 .
. 3 4 . 9 8 2 . 5
. 4 . 6 . 9 5 . .
. . 9 . 4 7 6 . 8
. 6 . 8 . . . 9 4 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 953274861481956372276381459127465983598123746634798215842619537319547628765832194 #1 Extreme (8470)
Hidden Single: r4c4=4
Hidden Single: r9c2=6
Hidden Single: r3c5=8
Hidden Single: r8c3=9
Hidden Single: r8c5=4
Hidden Single: r7c4=6
Hidden Single: r2c6=6
Hidden Single: r3c2=7
Hidden Single: r3... |
normal_sudoku_5583 | 86.1....52...8..61.....6.48.5.8....43...49...4.2.7....94..12...127938456...4.7.1. | 863124795294785361571396248759863124316249587482571639945612873127938456638457912 | Basic 9x9 Sudoku 5583 | 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 6 . 1 . . . . 5
2 . . . 8 . . 6 1
. . . . . 6 . 4 8
. 5 . 8 . . . . 4
3 . . . 4 9 . . .
4 . 2 . 7 . . . .
9 4 . . 1 2 . . .
1 2 7 9 3 8 4 5 6
. . . 4 . 7 . 1 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 863124795294785361571396248759863124316249587482571639945612873127938456638457912 #1 Hard (900)
Hidden Single: r8c7=4
Hidden Single: r8c6=8
Naked Single: r8c2=2
Hidden Single: r7c5=1
Skyscraper: 4 in r2c6,r5c5 (connected by r25c3) => r1c5,r6c6<>4
Hidden Single: r5c5=4
Hidden Single: r6c1=4
X-Win... |
normal_sudoku_164 | .8...2..69..4...3.....8.5.....6.41...4.52...3..6..3.457.9........1..7.59.3.2....7 | 584732916912456738673981524358694172147528693296173845769345281421867359835219467 | Basic 9x9 Sudoku 164 | 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 . . . 2 . . 6
9 . . 4 . . . 3 .
. . . . 8 . 5 . .
. . . 6 . 4 1 . .
. 4 . 5 2 . . . 3
. . 6 . . 3 . 4 5
7 . 9 . . . . . .
. . 1 . . 7 . 5 9
. 3 . 2 . . . . 7 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 584732916912456738673981524358694172147528693296173845769345281421867359835219467 #1 Extreme (22022) bf
Brute Force: r5c4=5
Almost Locked Set XZ-Rule: A=r4c5 {79}, B=r5c136 {1789}, X=9, Z=7 => r4c23<>7
Forcing Net Contradiction in c2 => r2c2<>2
r2c2=2 (r2c3<>2) r3c3<>2 r4c3=2 (r4c3<>5) r4c3<>3 r4c1=3 r4c1<>5... |
normal_sudoku_593 | 67.8.4...2.4.16....8.27.46.4..1.2...817469532..2..7.4.12.64...8.487.1...7.6.28..4 | 671834925254916873983275461439152687817469532562387149125643798348791256796528314 | Basic 9x9 Sudoku 593 | 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.
| 6 7 . 8 . 4 . . .
2 . 4 . 1 6 . . .
. 8 . 2 7 . 4 6 .
4 . . 1 . 2 . . .
8 1 7 4 6 9 5 3 2
. . 2 . . 7 . 4 .
1 2 . 6 4 . . . 8
. 4 8 7 . 1 . . .
7 . 6 . 2 8 . . 4 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 671834925254916873983275461439152687817469532562387149125643798348791256796528314 #1 Extreme (35218) bf
Hidden Single: r3c5=7
Hidden Single: r9c1=7
Hidden Single: r1c1=6
Hidden Single: r9c6=8
Hidden Single: r3c7=4
Hidden Single: r7c5=4
Hidden Single: r8c2=4
Hidden Single: r6c8=4
Hidden Single... |
normal_sudoku_4284 | .9.3..26.5...921..........9.6.4...9...7.618..4...7.5.66..8....2.8...9.....3.4..8. | 791354268548692173326187459865423791937561824412978536679815342284739615153246987 | Basic 9x9 Sudoku 4284 | 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 . . 2 6 .
5 . . . 9 2 1 . .
. . . . . . . . 9
. 6 . 4 . . . 9 .
. . 7 . 6 1 8 . .
4 . . . 7 . 5 . 6
6 . . 8 . . . . 2
. 8 . . . 9 . . .
. . 3 . 4 . . 8 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 791354268548692173326187459865423791937561824412978536679815342284739615153246987 #1 Extreme (36298) bf
Brute Force: r5c5=6
Hidden Single: r6c9=6
Hidden Single: r2c5=9
Discontinuous Nice Loop: 2 r5c1 -2- r5c8 =2= r6c8 -2- r6c4 -9- r6c3 =9= r5c1 => r5c1<>2
Forcing Chain Contradiction in r9c7 => r4c9<>8
... |
normal_sudoku_1941 | 49.8.1....83.59.1452134....95.4...813.81.5...214..8...8....31..13..84.76..5.1.... | 496871253783259614521346798957462381368195427214738569879623145132584976645917832 | Basic 9x9 Sudoku 1941 | 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 9 . 8 . 1 . . .
. 8 3 . 5 9 . 1 4
5 2 1 3 4 . . . .
9 5 . 4 . . . 8 1
3 . 8 1 . 5 . . .
2 1 4 . . 8 . . .
8 . . . . 3 1 . .
1 3 . . 8 4 . 7 6
. . 5 . 1 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 496871253783259614521346798957462381368195427214738569879623145132584976645917832 #1 Extreme (14508) bf
Hidden Single: r5c3=8
Hidden Single: r2c8=1
Hidden Single: r6c2=1
Hidden Single: r9c5=1
Hidden Single: r3c3=1
Hidden Single: r6c6=8
Hidden Single: r4c4=4
Hidden Single: r3c1=5
Hidden Single... |
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