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 | .9...1..6.7..65.....64..195..4..76525...4.71..1..8....3..7.......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 . . . 1 . . 6
. 7 . . 6 5 . . .
. . 6 4 . . 1 9 5
. . 4 . . 7 6 5 2
5 . . . 4 . 7 1 .
. 1 . . 8 . . . .
3 . . 7 . . . . .
. . 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 | ..4.6...7.....38.....1...9...78...4..4.7.25..9...4...8..16...8.3.......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 . . . 7
. . . . . 3 8 . .
. . . 1 . . . 9 .
. . 7 8 . . . 4 .
. 4 . 7 . 2 5 . .
9 . . . 4 . . . 8
. . 1 6 . . . 8 .
3 . . . . . . . 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....18.4.79...92.......6......4.39..2.....4.9.84.9.1.78..2.....918..7....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 . .
. . 1 8 . 4 . 7 9
. . . 9 2 . . . .
. . . 6 . . . . .
. 4 . 3 9 . . 2 .
. . . . 4 . 9 . 8
4 . 9 . 1 . 7 8 .
. 2 . . . . . 9 1
8 . . 7 . . . . 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..7..3.2...........46.3..16.....783...1..96.29...54.7.3..7.....8...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 . . 7 . . 3 . 2
. . . . . . . . .
. . 4 6 . 3 . . 1
6 . . . . . 7 8 3
. . . 1 . . 9 6 .
2 9 . . . 5 4 . 7
. 3 . . 7 . . . .
. 8 . . . 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....896.4.9.3..9..1.3..7..1.7.....6..59..1..2..4.9......72...9..2...3 | 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 . 9 . 3 . .
9 . . 1 . 3 . . 7
. . 1 . 7 . . . .
. 6 . . 5 9 . . 1
. . 2 . . 4 . 9 .
. . . . . 7 2 . .
. 9 . . 2 . . . 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 | ..2..9.8.7...8.4....12.5.393..7....1..4.53.78..5.2...4..8.9...5.1.......2......6. | 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.
| . . 2 . . 9 . 8 .
7 . . . 8 . 4 . .
. . 1 2 . 5 . 3 9
3 . . 7 . . . . 1
. . 4 . 5 3 . 7 8
. . 5 . 2 . . . 4
. . 8 . 9 . . . 5
. 1 . . . . . . .
2 . . . . . . 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....5.3..9..54.....21..3....73...9.7..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 . . . . 5 . 3 .
. 9 . . 5 4 . . .
. . 2 1 . . 3 . .
. . 7 3 . . . 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...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 . . . 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.....2...3.14..74..2....1....5.9.......1.5..8..32....35....4.6.8....3....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 . . . 3 . 1 4 .
. 7 4 . . 2 . . .
. 1 . . . . 5 . 9
. . . . . . . 1 .
5 . . 8 . . 3 2 .
. . . 3 5 . . . .
4 . 6 . 8 . . . .
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...5..8...32......7....5.8..21..24..9..88..52...46....2.....546...2......6.. | 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 . . . 5
. . 8 . . . 3 2 .
. . . . . 7 . . .
. 5 . 8 . . 2 1 .
. 2 4 . . 9 . . 8
8 . . 5 2 . . . 4
6 . . . . 2 . . .
. . 5 4 6 . . . 2
. . . . . . 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......5.37.916........7..67...9.37..51..3..9.3.7..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 . 9 1 6 .
. . . . . . . 7 .
. 6 7 . . . 9 . 3
7 . . 5 1 . . 3 .
. 9 . 3 . 7 . . 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......861.2......3....6...43........6.4..41.....7...4......652.9...3..7..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 . . . . .
. 8 6 1 . 2 . . .
. . . 3 . . . . 6
. . . 4 3 . . . .
. . . . 6 . 4 . .
4 1 . . . . . 7 .
. . 4 . . . . . .
6 5 2 . 9 . . . 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...4.983574.21....3.7..5...2......9..6..4.6.7..8...9...5..64.....28..753..... | 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 . 2 1
. . . . 3 . 7 . .
5 . . . 2 . . . .
. . 9 . . 6 . . 4
. 6 . 7 . . 8 . .
. 9 . . . 5 . . 6
4 . . . . . 2 8 .
. 7 5 3 . . . . . | 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....8.415.....5...83..93..7......92..1.6...5.9..7...68....37...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 . 4 1 5 . .
. . . 5 . . . 8 3
. . 9 3 . . 7 . .
. . . . 9 2 . . 1
. 6 . . . 5 . 9 .
. 7 . . . 6 8 . .
. . 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.....3...3...9.3.46....2..3...27.9..7...466..1....8......5.4.9..8.....5..7..6. | 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
. . . 3 . . . 9 .
3 . 4 6 . . . . 2
. . 3 . . . 2 7 .
9 . . 7 . . . 4 6
6 . . 1 . . . . 8
. . . . . . 5 . 4
. 9 . . 8 . . . .
. 5 . . 7 . . 6 . | 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 | 8..56.9.3.........5....9..19.8....1.153687.2.24.9...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 . . 5 6 . 9 . 3
. . . . . . . . .
5 . . . . 9 . . 1
9 . 8 . . . . 1 .
1 5 3 6 8 7 . 2 .
2 4 . 9 . . . 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....8....8....9.95...8..6.8.4.1.53....9...46..3...1.8...1..6......3..9.1396..4. | 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 . . . . 8 . .
. . 8 . . . . 9 .
9 5 . . . 8 . . 6
. 8 . 4 . 1 . 5 3
. . . . 9 . . . 4
6 . . 3 . . . 1 .
8 . . . 1 . . 6 .
. . . . . 3 . . 9
. 1 3 9 6 . . 4 . | 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 | .9...37.2...4.75.9.....5...7.1.3..2.34.........87.4..3..3......17.5..3..62..4...8 | 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.
| . 9 . . . 3 7 . 2
. . . 4 . 7 5 . 9
. . . . . 5 . . .
7 . 1 . 3 . . 2 .
3 4 . . . . . . .
. . 8 7 . 4 . . 3
. . 3 . . . . . .
1 7 . 5 . . 3 . .
6 2 . . 4 . . . 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...82..5....3.58.7.612..6...3..93.....5.....94......247........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 . . 5 . . . .
3 . 5 8 . 7 . 6 1
2 . . 6 . . . 3 .
. 9 3 . . . . . 5
. . . . . 9 4 . .
. . . . 2 4 7 . .
. . . . . . 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.......3.3..1...4......15.6....9.....9.452.7.7..8...12..6..... | 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 . . . . . . . 3
. 3 . . 1 . . . 4
. . . . . . 1 5 .
6 . . . . 9 . . .
. . 9 . 4 5 2 . 7
. 7 . . 8 . . . 1
2 . . 6 . . . . . | 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 | .......4.3..1..8...48..2..6.89.....25.27..3.......6.9.8.6.......715.....4536891.. | 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.
| . . . . . . . 4 .
3 . . 1 . . 8 . .
. 4 8 . . 2 . . 6
. 8 9 . . . . . 2
5 . 2 7 . . 3 . .
. . . . . 6 . 9 .
8 . 6 . . . . . .
. 7 1 5 . . . . .
4 5 3 6 8 9 1 . . | 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 | ....8.6..56.2.384.2.8....7....1...387..9..........67........48..82.6.3..4.3..7.2. | 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.
| . . . . 8 . 6 . .
5 6 . 2 . 3 8 4 .
2 . 8 . . . . 7 .
. . . 1 . . . 3 8
7 . . 9 . . . . .
. . . . . 6 7 . .
. . . . . . 4 8 .
. 8 2 . 6 . 3 . .
4 . 3 . . 7 . 2 . | 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......1....476....42..98..4.7....39....617...5.2..1.3....4..9...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 . . . .
. . 1 . . . . 4 7
6 . . . . 4 2 . .
9 8 . . 4 . 7 . .
. . 3 9 . . . . 6
1 7 . . . 5 . 2 .
. 1 . 3 . . . . 4
. . 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....7.5..6.7..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 . .
6 . 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...5.6.....9...2...31.1...2..5..8......2.19..4..6..8.52..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
. 6 . . . . . 9 .
. . 2 . . . 3 1 .
1 . . . 2 . . 5 .
. 8 . . . . . . 2
. 1 9 . . 4 . . 6
. . 8 . 5 2 . . 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 | .....3785...872..98..5..2..43...5.....8..96..61.7......4.2.6...38....1..2.5.1..4. | 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.
| . . . . . 3 7 8 5
. . . 8 7 2 . . 9
8 . . 5 . . 2 . .
4 3 . . . 5 . . .
. . 8 . . 9 6 . .
6 1 . 7 . . . . .
. 4 . 2 . 6 . . .
3 8 . . . . 1 . .
2 . 5 . 1 . . 4 . | 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 | .2.6...3.........1....37..48..2.651.2.634.89...7..5.............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 . . . 3 .
. . . . . . . . 1
. . . . 3 7 . . 4
8 . . 2 . 6 5 1 .
2 . 6 3 4 . 8 9 .
. . 7 . . 5 . . .
. . . . . . . . .
. 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..9.35.6.9.7.8.....6.....5..388..5..7...73..96.5.5...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 . 7
. 8 . . . . . 6 .
. . . . 5 . . 3 8
8 . . 5 . . 7 . .
. 7 3 . . 9 6 . 5
. 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...3.8....36...5.5....14.68.13..........7.48..9..617....5...8.9..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 . . . 3 . 8 . .
. . 3 6 . . . 5 .
5 . . . . 1 4 . 6
8 . 1 3 . . . . .
. . . . . 7 . 4 8
. . 9 . . 6 1 7 .
. . . 5 . . . 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...9.........7....52...5....9.....1....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 . . . 9 .
. . . . . . . . 7
. . . . 5 2 . . .
5 . . . . 9 . . .
. . 1 . . . . 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...3.4.7.8...61...29....6..7.1..7..6....1.7.2..4.......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 . 7 . 8 .
. . 6 1 . . . 2 9
. . . . 6 . . 7 .
1 . . 7 . . 6 . .
. . 1 . 7 . 2 . .
4 . . . . . . . 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......4..5.197..7..8.....6......2..7..5613.5.......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 . . . . . . 4
. . 5 . 1 9 7 . .
7 . . 8 . . . . .
6 . . . . . . 2 .
. 7 . . 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......4938....19.4..6......2.15.4..9......356.7.15......39..1.5.........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 .
. . . . . 4 9 3 8
. . . . 1 9 . 4 .
. 6 . . . . . . 2
. 1 5 . 4 . . 9 .
. . . . . 3 5 6 .
7 . 1 5 . . . . .
. 3 9 . . 1 . 5 .
. . . . . . . . 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..........435....7.....5.95....47.12..7386..9....7.5.4...213.....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 . . . . . . .
. . . 4 3 5 . . .
. 7 . . . . . 5 .
9 5 . . . . 4 7 .
1 2 . . 7 3 8 6 .
. 9 . . . . 7 . 5
. 4 . . . 2 1 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.......7.7..8.6....8..9.1...35.8.9.5...67..3.....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 . . . . . . . 7
. 7 . . 8 . 6 . .
. . 8 . . 9 . 1 .
. . 3 5 . 8 . 9 .
5 . . . 6 7 . . 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 | .4....9.....29.4.6.2.345..8..16..5.7...15.64.7..4.2....5..24...3....8..4.9....86. | 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 . . . . 9 . .
. . . 2 9 . 4 . 6
. 2 . 3 4 5 . . 8
. . 1 6 . . 5 . 7
. . . 1 5 . 6 4 .
7 . . 4 . 2 . . .
. 5 . . 2 4 . . .
3 . . . . 8 . . 4
. 9 . . . . 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..51..1..973....3...8.24.6...9..7....8....9..5..3.5..1.4..6..2..........3..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
. . 1 . . 9 7 3 .
. . . 3 . . . 8 .
2 4 . 6 . . . 9 .
. 7 . . . . 8 . .
. . 9 . . 5 . . 3
. 5 . . 1 . 4 . .
6 . . 2 . . . . .
. . . . . 3 . . 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....9..7....97.8..926..1..75.....6..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 . . . . 9 . . 7
. . . . 9 7 . 8 .
. 9 2 6 . . 1 . .
7 5 . . . . . 6 .
. 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 | ......1..4....9..7..72...39..6.2..73.8.7.36.....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.
| . . . . . . 1 . .
4 . . . . 9 . . 7
. . 7 2 . . . 3 9
. . 6 . 2 . . 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 | 9.52486...27.9.8..6......9.....627...9.7....87.64.95..2......5......4........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 . .
. 2 7 . 9 . 8 . .
6 . . . . . . 9 .
. . . . 6 2 7 . .
. 9 . 7 . . . . 8
7 . 6 4 . 9 5 . .
2 . . . . . . 5 .
. . . . . 4 . . .
. . . . . 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....6...35.8.2....6813.74..2.....8...35......1....51...6.8.8.....3.1.2.....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 . . . . 6
. . . 3 5 . 8 . 2
. . . . 6 8 1 3 .
7 4 . . 2 . . . .
. 8 . . . 3 5 . .
. . . . 1 . . . .
5 1 . . . 6 . 8 .
8 . . . . . 3 . 1
. 2 . . . . . 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...5513....6....1........29....1...3..5.43..6.2..986...1..2..68...3..7....96 | 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 . . . 5
5 1 3 . . . . 6 .
. . . 1 . . . . .
. . . 2 9 . . . .
1 . . . 3 . . 5 .
4 3 . . 6 . 2 . .
9 8 6 . . . 1 . .
2 . . 6 8 . . . 3
. . 7 . . . . 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...68.4.6...5...2...6..38......7..6547.....3...14.6.8136...9.9.12...53....9... | 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 . . . 6 8 .
4 . 6 . . . 5 . .
. 2 . . . 6 . . 3
8 . . . . . . 7 .
. 6 5 4 7 . . . .
. 3 . . . 1 4 . 6
. 8 1 3 6 . . . 9
. 9 . 1 2 . . . 5
3 . . . . 9 . . . | 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..83..5.28.46..3.....71.7.31.62...24.835..........3...9...5.6..27....4.8..... | 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 .
. 5 . 2 8 . 4 6 .
. 3 . . . . . 7 1
. 7 . 3 1 . 6 2 .
. . 2 4 . 8 3 5 .
. . . . . . . . .
3 . . . 9 . . . 5
. 6 . . 2 7 . . .
. 4 . 8 . . . . . | 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 | .9.41..27........15....79...75..3...31.8.42....9.5.3.........46..26.....96..387.. | 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 . 4 1 . . 2 7
. . . . . . . . 1
5 . . . . 7 9 . .
. 7 5 . . 3 . . .
3 1 . 8 . 4 2 . .
. . 9 . 5 . 3 . .
. . . . . . . 4 6
. . 2 6 . . . . .
9 6 . . 3 8 7 . . | 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..8..7...1..4...78..67.2..1......5..72.......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 . . 7 . . . 1
. . 4 . . . 7 8 .
. 6 7 . 2 . . 1 .
. . . . . 5 . . 7
2 . . . . . . . 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....2.16..5...5..24....7....6......459.35...6...171......5.4..72...6.2.1.... | 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 . 1 6 . . 5 . .
. 5 . . 2 4 . . .
. 7 . . . . 6 . .
. . . . 4 5 9 . 3
5 . . . 6 . . . 1
7 1 . . . . . . 5
. 4 . . 7 2 . . .
6 . 2 . 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..75.3.......8.7..16..3....6.18...15....6.....7..78.....4..6..7..9...5...... | 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
. 3 . . . . . . .
8 . 7 . . 1 6 . .
3 . . . . 6 . 1 8
. . . 1 5 . . . .
6 . . . . . 7 . .
7 8 . . . . . 4 .
. 6 . . 7 . . 9 .
. . 5 . . . . . . | 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 | .4..9..5.1....3.866....1..28....2..3.....78....7....2.5..12......1.....5.36..5... | 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.
| . 4 . . 9 . . 5 .
1 . . . . 3 . 8 6
6 . . . . 1 . . 2
8 . . . . 2 . . 3
. . . . . 7 8 . .
. . 7 . . . . 2 .
5 . . 1 2 . . . .
. . 1 . . . . . 5
. 3 6 . . 5 . . . | 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.....2.391....6...922.....1...9..4236.8.5....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 . .
. . . 2 . 3 9 1 .
. . . 6 . . . 9 2
2 . . . . . 1 . .
. 9 . . 4 2 3 6 .
8 . 5 . . . . 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 | .9..8.....5.27...81..69.25..13..........34.9..2....8....1...5...3.9.7.....214.... | 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.
| . 9 . . 8 . . . .
. 5 . 2 7 . . . 8
1 . . 6 9 . 2 5 .
. 1 3 . . . . . .
. . . . 3 4 . 9 .
. 2 . . . . 8 . .
. . 1 . . . 5 . .
. 3 . 9 . 7 . . .
. . 2 1 4 . . . . | 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 | ..1.46..27.2..3....4......7..9.5..7.53.12..8.4........32....19.6.......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 . 4 6 . . 2
7 . 2 . . 3 . . .
. 4 . . . . . . 7
. . 9 . 5 . . 7 .
5 3 . 1 2 . . 8 .
4 . . . . . . . .
3 2 . . . . 1 9 .
6 . . . . . . . 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 | ...14...9..65...........18.7452....1..3.14...2..385.4..18........9...7...376295.. | 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.
| . . . 1 4 . . . 9
. . 6 5 . . . . .
. . . . . . 1 8 .
7 4 5 2 . . . . 1
. . 3 . 1 4 . . .
2 . . 3 8 5 . 4 .
. 1 8 . . . . . .
. . 9 . . . 7 . .
. 3 7 6 2 9 5 . . | 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....36.1..6..21.882....4...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 . . . . 3 6 . 1
. . 6 . . 2 1 . 8
8 2 . . . . 4 . .
. 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....3....2..8.9..4.....1...4..183.9..6..7.9.1..5......6..6.8..7.1....24.. | 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 . . . . 2
. . 8 . 9 . . 4 .
. . . . 1 . . . 4
. . 1 8 3 . 9 . .
6 . . 7 . 9 . 1 .
. 5 . . . . . . 6
. . 6 . 8 . . 7 .
1 . . . . 2 4 . . | 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..7.5.9..4.....75....4..1..2.........38..1..4...5...79...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 . 9 .
. 4 . . . . . 7 5
. . . . 4 . . 1 .
. 2 . . . . . . .
. . 3 8 . . 1 . .
4 . . . 5 . . . 7
9 . . . 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..5.81.5..8.....8.9..4..2.........49....12.632...9....8.7...71..463.9.9.1.2.6. | 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 . . 5 . 8 1
. 5 . . 8 . . . .
. 8 . 9 . . 4 . .
2 . . . . . . . .
. 4 9 . . . . 1 2
. 6 3 2 . . . 9 .
. . . 8 . 7 . . .
7 1 . . 4 6 3 . 9
. 9 . 1 . 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..2...78.....129..14...76.1....8.84972.3...3..69......95...8..4....2.57..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 . . 2 . .
. 7 8 . . . . . 1
2 9 . . 1 4 . . .
7 6 . 1 . . . . 8
. 8 4 9 7 2 . 3 .
. . 3 . . 6 9 . .
. . . . 9 5 . . .
8 . . 4 . . . . 2
. 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...6.9...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 .
. . 6 . 9 . . . 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..65.8....62.9..6.5..48....7........3..955..8......2.....8.48.59...2......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 . . . . 6 2 . 9
. . 6 . 5 . . 4 8
. . . . 7 . . . .
. . . . 3 . . 9 5
5 . . 8 . . . . .
. 2 . . . . . 8 .
4 8 . 5 9 . . . 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 | 37..965.49..45...7.....2.8.....4...56...1.....1.7.5.......8...2.61...4..23....75. | 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 . . 9 6 5 . 4
9 . . 4 5 . . . 7
. . . . . 2 . 8 .
. . . . 4 . . . 5
6 . . . 1 . . . .
. 1 . 7 . 5 . . .
. . . . 8 . . . 2
. 6 1 . . . 4 . .
2 3 . . . . 7 5 . | 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 | ..2..3..818.57......318..7..19..578.......9..6...9...42.........3...7.5...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 . . 3 . . 8
1 8 . 5 7 . . . .
. . 3 1 8 . . 7 .
. 1 9 . . 5 7 8 .
. . . . . . 9 . .
6 . . . 9 . . . 4
2 . . . . . . . .
. 3 . . . 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.........94...6352...9.....3.6...6.5.....8..7.29.17..4....2.4..58...9.1..... | 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 . . . .
. . . . . 9 4 . .
. 6 3 5 2 . . . 9
. . . . . 3 . 6 .
. . 6 . 5 . . . .
. 8 . . 7 . 2 9 .
1 7 . . 4 . . . .
2 . 4 . . 5 8 . .
. 9 . 1 . . . . . | 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...287...5.6..3.........2.1...1..4.5.2..5....893..6.42. | 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 .
. . 2 8 7 . . . 5
. 6 . . 3 . . . .
. . . . . 2 . 1 .
. . 1 . . 4 . 5 .
2 . . 5 . . . . 8
9 3 . . 6 . 4 2 . | 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.............943...7.5..4....4.8..25......6.71..2...4..2.95..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
. . . . . . . . .
. . . . 9 4 3 . .
. 7 . 5 . . 4 . .
. . 4 . 8 . . 2 5
. . . . . . 6 . 7
1 . . 2 . . . 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...8..2.......5.71..8.6.....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 . . 2 . . . . .
. . 5 . 7 1 . . 8
. 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.....2459........841.52..7...8......8.9..1....9.47358.9......263.5.16..7....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 . . . . .
2 4 5 9 . . . . .
. . . 8 4 1 . 5 2
. . 7 . . . 8 . .
. . . . 8 . 9 . .
1 . . . . 9 . 4 7
3 5 8 . 9 . . . .
. . 2 6 3 . 5 . 1
6 . . 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..1..7....7..53......8..165.8.1..3.1.6..7.5..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 . . 7 .
. . . 7 . . 5 3 .
. . . . . 8 . . 1
6 5 . 8 . 1 . . 3
. 1 . 6 . . 7 . 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 | ..8.6.4.2........12...1.5......56.28..5..26...2.84...5....8..5.9.36..81....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 . 6 . 4 . 2
. . . . . . . . 1
2 . . . 1 . 5 . .
. . . . 5 6 . 2 8
. . 5 . . 2 6 . .
. 2 . 8 4 . . . 5
. . . . 8 . . 5 .
9 . 3 6 . . 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 | .4...3.9...9.286....8..4.....1..69...6..5.4..8......7...5.3...9..46...52672...3.. | 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 . . . 3 . 9 .
. . 9 . 2 8 6 . .
. . 8 . . 4 . . .
. . 1 . . 6 9 . .
. 6 . . 5 . 4 . .
8 . . . . . . 7 .
. . 5 . 3 . . . 9
. . 4 6 . . . 5 2
6 7 2 . . . 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.......8...4.....218.7.6..9..........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 . . . . .
. . 8 . . . 4 . .
. . . 2 1 8 . 7 .
6 . . 9 . . . . .
. . . . . 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...867..3.......1.5.3....9..56...2.....7.4.......8..65..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 . . 3 . . . . .
. . 1 . 5 . 3 . .
. . 9 . . 5 6 . .
. 2 . . . . . 7 .
4 . . . . . . . 8
. . 6 5 . . 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 | .5...468....1..9..2.3...5...14537.9.5......373..........76.5...1..4.8.59.8..1..4. | 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.
| . 5 . . . 4 6 8 .
. . . 1 . . 9 . .
2 . 3 . . . 5 . .
. 1 4 5 3 7 . 9 .
5 . . . . . . 3 7
3 . . . . . . . .
. . 7 6 . 5 . . .
1 . . 4 . 8 . 5 9
. 8 . . 1 . . 4 . | 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.......6......32.1.45...8.49.........349...5.61.7....9.7.526.3.4..1.2.....6.3.9. | 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
. . . . . . 3 2 .
1 . 4 5 . . . 8 .
4 9 . . . . . . .
. . 3 4 9 . . . 5
. 6 1 . 7 . . . .
9 . 7 . 5 2 6 . 3
. 4 . . 1 . 2 . .
. . . 6 . 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 | 4.38.........62....6..7....6.8...3...24...1.9.7142..5.......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 . 3 8 . . . . .
. . . . 6 2 . . .
. 6 . . 7 . . . .
6 . 8 . . . 3 . .
. 2 4 . . . 1 . 9
. 7 1 4 2 . . 5 .
. . . . . . 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....4..3..113..8.7.....8...7....39.12.4....1..6.....8.9.5...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 . .
. . 4 . . 3 . . 1
1 3 . . 8 . 7 . .
. . . 8 . . . 7 .
. . . 3 9 . 1 2 .
4 . . . . 1 . . 6
. . . . . 8 . 9 .
5 . . . 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 | .5.6....2.6......124.5.97....13.8.9...........3..614......73...4..1......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.
| . 5 . 6 . . . . 2
. 6 . . . . . . 1
2 4 . 5 . 9 7 . .
. . 1 3 . 8 . 9 .
. . . . . . . . .
. 3 . . 6 1 4 . .
. . . . 7 3 . . .
4 . . 1 . . . . .
. 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..8....1.3..7..4..2.7.5.....8.2.7..6....482..5..8..7....1....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 . . . . 1 .
3 . . 7 . . 4 . .
2 . 7 . 5 . . . .
. 8 . 2 . 7 . . 6
. . . . 4 8 2 . .
5 . . 8 . . 7 . .
. . 1 . . . . 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..367.....1.3..26.5.....958..4....7..9.5.6.9..3...7735..2...8......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 . . 3 6 7 .
. . . . 1 . 3 . .
2 6 . 5 . . . . .
9 5 8 . . 4 . . .
. 7 . . 9 . 5 . 6
. 9 . . 3 . . . 7
7 3 5 . . 2 . . .
8 . . . . . . 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 | 8.93..52..2.4......1.....98...1..3.56.1..9..2...6.4..7......6.4.....6.....39..... | 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 . 9 3 . . 5 2 .
. 2 . 4 . . . . .
. 1 . . . . . 9 8
. . . 1 . . 3 . 5
6 . 1 . . 9 . . 2
. . . 6 . 4 . . 7
. . . . . . 6 . 4
. . . . . 6 . . .
. . 3 9 . . . . . | 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 | .5..3..8.8...52..6..68..5......9....6..2...5...5.....12..5...38...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.
| . 5 . . 3 . . 8 .
8 . . . 5 2 . . 6
. . 6 8 . . 5 . .
. . . . 9 . . . .
6 . . 2 . . . 5 .
. . 5 . . . . . 1
2 . . 5 . . . 3 8
. . . 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...6....39...5..7..3..9...65..1.7.........31.6.2.4.1.2...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 . . . 6 . . . .
3 9 . . . 5 . . 7
. . 3 . . 9 . . .
6 5 . . 1 . 7 . .
. . . . . . . 3 1
. 6 . 2 . 4 . 1 .
2 . . . 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 | ....7..5.78........496.......17....2.....831....9.1.4..2.....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.
| . . . . 7 . . 5 .
7 8 . . . . . . .
. 4 9 6 . . . . .
. . 1 7 . . . . 2
. . . . . 8 3 1 .
. . . 9 . 1 . 4 .
. 2 . . . . . 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.....7......42.....1..9.1..62......58.1..2......7..9...56..4..6....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 . . . . .
7 . . . . . . 4 2
. . . . . 1 . . 9
. 1 . . 6 2 . . .
. . . 5 8 . 1 . .
2 . . . . . . 7 .
. 9 . . . 5 6 . .
4 . . 6 . . . . 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...3....1.38.9..32......4...6...6.......4..4.15...5.2...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 . . . 3 .
. . . 1 . 3 8 . 9
. . 3 2 . . . . .
. 4 . . . 6 . . .
6 . . . . . . . 4
. . 4 . 1 5 . . .
5 . 2 . . . 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 | .......29.3.6..4..2.49.83.....4.68..6.2.9..34.48..2.9...72....8..1......4......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.
| . . . . . . . 2 9
. 3 . 6 . . 4 . .
2 . 4 9 . 8 3 . .
. . . 4 . 6 8 . .
6 . 2 . 9 . . 3 4
. 4 8 . . 2 . 9 .
. . 7 2 . . . . 8
. . 1 . . . . . .
4 . . . . . . 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....918.....7.6....12....5.95.3..1...........2..1..69.4...13.2937....5.....9..4. | 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 . . . . 9 1 8 .
. . . . 7 . 6 . .
. . 1 2 . . . . 5
. 9 5 . 3 . . 1 .
. . . . . . . . .
. 2 . . 1 . . 6 9
. 4 . . . 1 3 . 2
9 3 7 . . . . 5 .
. . . . 9 . . 4 . | 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 | ........13...8.4...2..9.3.517.6.3...5....89....8.516.7...3..1...5.4..78..34...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.
| . . . . . . . . 1
3 . . . 8 . 4 . .
. 2 . . 9 . 3 . 5
1 7 . 6 . 3 . . .
5 . . . . 8 9 . .
. . 8 . 5 1 6 . 7
. . . 3 . . 1 . .
. 5 . 4 . . 7 8 .
. 3 4 . . . 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....4....7.72.....6.983....51...9138..6...3.78....8.6..5.1..57..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 . .
. . 4 . . . . 7 .
7 2 . . . . . 6 .
9 8 3 . . . . 5 1
. . . 9 1 3 8 . .
6 . . . 3 . 7 8 .
. . . 8 . 6 . . 5
. 1 . . 5 7 . . 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...4..5.....2......5..8..256.41.8..8..5.421..8..6..851..6.........8.1.....2... | 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 . . . 4 . .
5 . . . . . 2 . .
. . . . 5 . . 8 .
. 2 5 6 . 4 1 . 8
. . 8 . . 5 . 4 2
1 . . 8 . . 6 . .
8 5 1 . . 6 . . .
. . . . . . 8 . 1
. . . . . 2 . . . | 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 | .....6279367..2......7....1.13..4.......5.7......8........98...2.....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.
| . . . . . 6 2 7 9
3 6 7 . . 2 . . .
. . . 7 . . . . 1
. 1 3 . . 4 . . .
. . . . 5 . 7 . .
. . . . 8 . . . .
. . . . 9 8 . . .
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...6..7....51...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 . . . 6 .
. 7 . . . . 5 1 .
. . 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....3....6........746.....9...3.4..34.982.5.4...95.......76.8...8...9. | 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 . . . . 3 . .
. . 6 . . . . . .
. . 7 4 6 . . . .
. 9 . . . 3 . 4 .
. 3 4 . 9 8 2 . 5
. 4 . . . 9 5 . .
. . . . . 7 6 . 8
. . . 8 . . . 9 . | 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 | .6.1....52...8..61.....6.48.5.8....43....9.....2.7....94...2...1.7.3.4.....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.
| . 6 . 1 . . . . 5
2 . . . 8 . . 6 1
. . . . . 6 . 4 8
. 5 . 8 . . . . 4
3 . . . . 9 . . .
. . 2 . 7 . . . .
9 4 . . . 2 . . .
1 . 7 . 3 . 4 . .
. . . 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..7.5..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 .
. 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 | .7.8.4.....4.16....8.27..6.4..1.......7...53...2..7...12.6....8..87.......6.2...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.
| . 7 . 8 . 4 . . .
. . 4 . 1 6 . . .
. 8 . 2 7 . . 6 .
4 . . 1 . . . . .
. . 7 . . . 5 3 .
. . 2 . . 7 . . .
1 2 . 6 . . . . 8
. . 8 7 . . . . .
. . 6 . 2 . . . 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....21..........9.6.4...9...7.61...4...7.5..6..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 . . . . 2 1 . .
. . . . . . . . 9
. 6 . 4 . . . 9 .
. . 7 . 6 1 . . .
4 . . . 7 . 5 . .
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..4...34....95.....813.81.......4......8....31..1...84.76..5...... | 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 . . 4
. . . 3 4 . . . .
9 5 . . . . . 8 1
3 . 8 1 . . . . .
. . 4 . . . . . .
8 . . . . 3 1 . .
1 . . . 8 4 . 7 6
. . 5 . . . . . . | 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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