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_621 | ...3.....1....7..3.3..6.9.7..869.......12..4..2...36.9..........9.2..7.62.5.....1 | 752319864169847523834562917348695172976128345521473689617954238493281756285736491 | Basic 9x9 Sudoku 621 | 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 . . 3
. 3 . . 6 . 9 . 7
. . 8 6 9 . . . .
. . . 1 2 . . 4 .
. 2 . . . 3 6 . 9
. . . . . . . . .
. 9 . 2 . . 7 . 6
2 . 5 . . . . . 1 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 752319864169847523834562917348695172976128345521473689617954238493281756285736491 #1 Extreme (15074) bf
Brute Force: r5c4=1
Locked Candidates Type 1 (Pointing): 7 in b5 => r6c138<>7
Hidden Single: r4c8=7
Locked Candidates Type 1 (Pointing): 3 in b6 => r79c7<>3
Naked Pair: 5,8 in r5c69 => r5c127<>5, r5c7<... |
normal_sudoku_1646 | ..92..4.6....1.2..62............4.8.7..58.629..6.....4..5.3....86.7..9.59.7..5... | 379258416458316297621497853293674581714583629586129374145932768862741935937865142 | Basic 9x9 Sudoku 1646 | 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 2 . . 4 . 6
. . . . 1 . 2 . .
6 2 . . . . . . .
. . . . . 4 . 8 .
7 . . 5 8 . 6 2 9
. . 6 . . . . . 4
. . 5 . 3 . . . .
8 6 . 7 . . 9 . 5
9 . 7 . . 5 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 379258416458316297621497853293674581714583629586129374145932768862741935937865142 #1 Unfair (946)
Naked Single: r5c5=8
Hidden Single: r6c2=8
Hidden Single: r1c6=8
Hidden Single: r4c2=9
Locked Candidates Type 1 (Pointing): 5 in b4 => r12c1<>5
Naked Triple: 1,3,4 in r579c2 => r1c2<>1, r12c2<>3, r2c2<>4
... |
normal_sudoku_3659 | ..314..6.1.....8.46...581374.....5......2..4.....7...186.51.4.....7....8.45..36.. | 983147265157236894624958137471389526538621749296475381869512473312764958745893612 | Basic 9x9 Sudoku 3659 | 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 1 4 . . 6 .
1 . . . . . 8 . 4
6 . . . 5 8 1 3 7
4 . . . . . 5 . .
. . . . 2 . . 4 .
. . . . 7 . . . 1
8 6 . 5 1 . 4 . .
. . . 7 . . . . 8
. 4 5 . . 3 6 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 983147265157236894624958137471389526538621749296475381869512473312764958745893612 #1 Hard (608)
Hidden Single: r3c7=1
Hidden Single: r1c2=8
Hidden Single: r3c3=4
Hidden Single: r8c6=4
Hidden Single: r6c4=4
Hidden Single: r8c8=5
Hidden Single: r1c9=5
Hidden Single: r7c9=3
Hidden Single: r9c8=1... |
normal_sudoku_5951 | 941..6..3.7.5..1...8.3....61.2...4....71....5.59..43...1.7.32.4....8..3..2.4..5.. | 941826753673549128285317946132958467467132895859674312516793284794285631328461579 | Basic 9x9 Sudoku 5951 | 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 1 . . 6 . . 3
. 7 . 5 . . 1 . .
. 8 . 3 . . . . 6
1 . 2 . . . 4 . .
. . 7 1 . . . . 5
. 5 9 . . 4 3 . .
. 1 . 7 . 3 2 . 4
. . . . 8 . . 3 .
. 2 . 4 . . 5 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 941826753673549128285317946132958467467132895859674312516793284794285631328461579 #1 Easy (274)
Naked Single: r1c2=4
Naked Single: r3c3=5
Naked Single: r3c1=2
Hidden Single: r8c2=9
Hidden Single: r1c8=5
Hidden Single: r8c3=4
Hidden Single: r5c1=4
Hidden Single: r4c4=9
Hidden Single: r6c1=8
... |
normal_sudoku_3509 | ...14.5.9..19.3..8..98..6..7.........2.3.7.9...351.2.79...3......87....4.6.....5. | 382146579671953428549872631715629843426387195893514267954231786238765914167498352 | Basic 9x9 Sudoku 3509 | 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 . 9
. . 1 9 . 3 . . 8
. . 9 8 . . 6 . .
7 . . . . . . . .
. 2 . 3 . 7 . 9 .
. . 3 5 1 . 2 . 7
9 . . . 3 . . . .
. . 8 7 . . . . 4
. 6 . . . . . 5 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 382146579671953428549872631715629843426387195893514267954231786238765914167498352 #1 Extreme (5132)
Hidden Single: r1c9=9
Empty Rectangle: 6 in b9 (r47c4) => r4c8<>6
Forcing Chain Contradiction in r6 => r5c5=8
r5c5<>8 r5c5=6 r2c5<>6 r2c1=6 r6c1<>6
r5c5<>8 r5c5=6 r6c6<>6
r5c5<>8 r5c5=6 r4c4<>6 r7c4=6 r7c9... |
normal_sudoku_3465 | .....93....958..27..7.2..8..9....8..4.....5...58.6..7...16..492..5.1.7.....8.2.1. | 812749356349586127567321984296157843473298561158463279781635492625914738934872615 | Basic 9x9 Sudoku 3465 | 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 . .
. . 9 5 8 . . 2 7
. . 7 . 2 . . 8 .
. 9 . . . . 8 . .
4 . . . . . 5 . .
. 5 8 . 6 . . 7 .
. . 1 6 . . 4 9 2
. . 5 . 1 . 7 . .
. . . 8 . 2 . 1 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 812749356349586127567321984296157843473298561158463279781635492625914738934872615 #1 Easy (252)
Naked Single: r7c7=4
Naked Single: r9c7=6
Naked Single: r2c7=1
Naked Single: r8c8=3
Naked Single: r3c7=9
Full House: r6c7=2
Naked Single: r5c8=6
Naked Single: r8c6=4
Naked Single: r8c9=8
Full Ho... |
normal_sudoku_5497 | .465........7.369.5...8..1.1...9..28.53...9.7...4..1...8..5.2.99.2...4.1..5.3..8. | 346519872821743695579286314164397528253861947798425163687154239932678451415932786 | Basic 9x9 Sudoku 5497 | 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 5 . . . . .
. . . 7 . 3 6 9 .
5 . . . 8 . . 1 .
1 . . . 9 . . 2 8
. 5 3 . . . 9 . 7
. . . 4 . . 1 . .
. 8 . . 5 . 2 . 9
9 . 2 . . . 4 . 1
. . 5 . 3 . . 8 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 346519872821743695579286314164397528253861947798425163687154239932678451415932786 #1 Easy (204)
Naked Single: r5c7=9
Naked Single: r9c9=6
Naked Single: r9c7=7
Naked Single: r3c7=3
Naked Single: r7c8=3
Full House: r8c8=5
Naked Single: r9c1=4
Naked Single: r9c2=1
Naked Single: r1c7=8
Full Ho... |
normal_sudoku_5943 | .6...7...1..5.34....3.12..89...3..1...42....5.7..5.3...8.3.69..5...2.7.3..91...8. | 465987132128563497793412568952738614634291875871654329287346951516829743349175286 | Basic 9x9 Sudoku 5943 | 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 . . . 7 . . .
1 . . 5 . 3 4 . .
. . 3 . 1 2 . . 8
9 . . . 3 . . 1 .
. . 4 2 . . . . 5
. 7 . . 5 . 3 . .
. 8 . 3 . 6 9 . .
5 . . . 2 . 7 . 3
. . 9 1 . . . 8 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 465987132128563497793412568952738614634291875871654329287346951516829743349175286 #1 Easy (368)
Hidden Single: r2c6=3
Hidden Single: r7c8=5
Hidden Single: r9c6=5
Hidden Single: r1c8=3
Hidden Single: r1c7=1
Hidden Single: r7c9=1
Hidden Single: r4c4=7
Hidden Single: r1c3=5
Hidden Single: r3c7=5... |
normal_sudoku_2709 | 1.23.8...87..4.1....3...2.9..893.5.7.2...4.......1.6.8..5..6..1.6...345.....753.. | 192358764876249135453761289618932547527684913349517628935426871761893452284175396 | Basic 9x9 Sudoku 2709 | 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 . 2 3 . 8 . . .
8 7 . . 4 . 1 . .
. . 3 . . . 2 . 9
. . 8 9 3 . 5 . 7
. 2 . . . 4 . . .
. . . . 1 . 6 . 8
. . 5 . . 6 . . 1
. 6 . . . 3 4 5 .
. . . . 7 5 3 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 192358764876249135453761289618932547527684913349517628935426871761893452284175396 #1 Easy (204)
Naked Single: r4c7=5
Naked Single: r8c9=2
Naked Single: r4c6=2
Naked Single: r1c7=7
Naked Single: r5c7=9
Full House: r7c7=8
Naked Single: r5c9=3
Naked Single: r9c9=6
Naked Single: r2c6=9
Naked S... |
normal_sudoku_2385 | 8..........3..76..1.7..5..29......143.48..2...5.94.7.....1.4......7.9..3..9....41 | 846392175523417698197685432978526314364871259251943786685134927412759863739268541 | Basic 9x9 Sudoku 2385 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 8 . . . . . . . .
. . 3 . . 7 6 . .
1 . 7 . . 5 . . 2
9 . . . . . . 1 4
3 . 4 8 . . 2 . .
. 5 . 9 4 . 7 . .
. . . 1 . 4 . . .
. . . 7 . 9 . . 3
. . 9 . . . . 4 1 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 846392175523417698197685432978526314364871259251943786685134927412759863739268541 #1 Medium (390)
Hidden Single: r7c6=4
Hidden Single: r2c5=1
Hidden Single: r1c7=1
Hidden Single: r9c6=8
Naked Single: r9c7=5
Naked Single: r8c7=8
Naked Single: r4c7=3
Naked Single: r7c7=9
Full House: r3c7=4
H... |
normal_sudoku_2185 | ..73...2.5.4.6....1....5..82.9.34....4..27.9....9..2.48.....1........6....24...7. | 987341526534862719126795438259134867648527391713986254895673142471259683362418975 | Basic 9x9 Sudoku 2185 | 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 3 . . . 2 .
5 . 4 . 6 . . . .
1 . . . . 5 . . 8
2 . 9 . 3 4 . . .
. 4 . . 2 7 . 9 .
. . . 9 . . 2 . 4
8 . . . . . 1 . .
. . . . . . 6 . .
. . 2 4 . . . 7 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 987341526534862719126795438259134867648527391713986254895673142471259683362418975 #1 Extreme (6670)
Hidden Single: r6c7=2
Hidden Single: r7c8=4
Hidden Single: r8c1=4
Hidden Single: r6c1=7
Locked Candidates Type 1 (Pointing): 8 in b1 => r46c2<>8
Naked Pair: 3,6 in r3c38 => r3c27<>3, r3c2<>6
Empty Re... |
normal_sudoku_89 | ..6.1...4..1.7629..7.9...1.7...54.3..5...9.....37.2....3.4...5.2.....8......97..1 | 986213574341576298572948613728654139654139782193782465837421956219365847465897321 | Basic 9x9 Sudoku 89 | 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 . . . 4
. . 1 . 7 6 2 9 .
. 7 . 9 . . . 1 .
7 . . . 5 4 . 3 .
. 5 . . . 9 . . .
. . 3 7 . 2 . . .
. 3 . 4 . . . 5 .
2 . . . . . 8 . .
. . . . 9 7 . . 1 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 986213574341576298572948613728654139654139782193782465837421956219365847465897321 #1 Unfair (1626)
Hidden Single: r2c5=7
Hidden Single: r3c5=4
Hidden Single: r3c3=2
Hidden Single: r7c5=2
Hidden Single: r1c4=2
Hidden Single: r4c2=2
Hidden Single: r9c8=2
Hidden Single: r5c9=2
Locked Candidates ... |
normal_sudoku_3742 | 16.5.9.8...8...6.9.4.68.5.....1....6.849.........46...27...1..5....6.4..........1 | 163529784528714639947683512395178246684952173712346958279431865831265497456897321 | Basic 9x9 Sudoku 3742 | 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 . 5 . 9 . 8 .
. . 8 . . . 6 . 9
. 4 . 6 8 . 5 . .
. . . 1 . . . . 6
. 8 4 9 . . . . .
. . . . 4 6 . . .
2 7 . . . 1 . . 5
. . . . 6 . 4 . .
. . . . . . . . 1 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 163529784528714639947683512395178246684952173712346958279431865831265497456897321 #1 Extreme (16846) bf
Hidden Single: r3c4=6
Hidden Single: r5c1=6
Hidden Single: r2c5=1
Hidden Single: r1c9=4
Hidden Single: r4c8=4
Hidden Single: r7c4=4
Hidden Single: r9c1=4
Hidden Single: r3c8=1
Hidden Single... |
normal_sudoku_6195 | ....2..968....95...9......8...1....4..82.76..3...5..2.5......6...3..67....74....1 | 745328196831649572692571438279163854458297613316854927584712369123986745967435281 | Basic 9x9 Sudoku 6195 | 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 6
8 . . . . 9 5 . .
. 9 . . . . . . 8
. . . 1 . . . . 4
. . 8 2 . 7 6 . .
3 . . . 5 . . 2 .
5 . . . . . . 6 .
. . 3 . . 6 7 . .
. . 7 4 . . . . 1 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 745328196831649572692571438279163854458297613316854927584712369123986745967435281 #1 Extreme (29910) bf
Brute Force: r5c4=2
Forcing Chain Contradiction in r5 => r7c6<>8
r7c6=8 r4c6<>8 r4c6=3 r5c5<>3
r7c6=8 r789c5<>8 r4c5=8 r4c78<>8 r6c7=8 r6c7<>1 r5c8=1 r5c8<>3
r7c6=8 r7c6<>2 r9c6=2 r9c6<>5 r9c8=5 r8c9<>5 r... |
normal_sudoku_1155 | 4....69...2.....8..95.....3....57..978.61....25149.7...381...2...43....51....43.. | 413826957627935481895741263346257819789613542251498736538179624964382175172564398 | Basic 9x9 Sudoku 1155 | 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 9 . .
. 2 . . . . . 8 .
. 9 5 . . . . . 3
. . . . 5 7 . . 9
7 8 . 6 1 . . . .
2 5 1 4 9 . 7 . .
. 3 8 1 . . . 2 .
. . 4 3 . . . . 5
1 . . . . 4 3 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 413826957627935481895741263346257819789613542251498736538179624964382175172564398 #1 Medium (414)
Hidden Single: r6c2=5
Hidden Single: r5c3=9
Hidden Single: r3c1=8
Hidden Single: r4c2=4
Hidden Single: r9c3=2
Hidden Single: r1c2=1
Hidden Single: r7c1=5
Naked Single: r7c6=9
Hidden Single: r9c4=... |
normal_sudoku_835 | ..8...2.6.9..5....5.......8..7....4.28...671.3.4..9..5.7....9..913..7.....54..... | 748931256692854371531672498157328649289546713364719825476185932913267584825493167 | Basic 9x9 Sudoku 835 | 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 . . . 2 . 6
. 9 . . 5 . . . .
5 . . . . . . . 8
. . 7 . . . . 4 .
2 8 . . . 6 7 1 .
3 . 4 . . 9 . . 5
. 7 . . . . 9 . .
9 1 3 . . 7 . . .
. . 5 4 . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 748931256692854371531672498157328649289546713364719825476185932913267584825493167 #1 Easy (314)
Naked Single: r5c1=2
Naked Single: r5c3=9
Naked Single: r6c2=6
Naked Single: r5c9=3
Naked Single: r4c1=1
Full House: r4c2=5
Naked Single: r6c7=8
Naked Single: r9c2=2
Naked Single: r5c4=5
Full Ho... |
normal_sudoku_1594 | ...48..9.....738...9...2....1.....7...9...3.66..7...5.......72.2..63....3.52194.. | 537481692126973845498562137812356974759124386643798251961845723284637519375219468 | Basic 9x9 Sudoku 1594 | 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 8 . . 9 .
. . . . 7 3 8 . .
. 9 . . . 2 . . .
. 1 . . . . . 7 .
. . 9 . . . 3 . 6
6 . . 7 . . . 5 .
. . . . . . 7 2 .
2 . . 6 3 . . . .
3 . 5 2 1 9 4 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 537481692126973845498562137812356974759124386643798251961845723284637519375219468 #1 Medium (370)
Naked Single: r9c5=1
Naked Single: r9c9=8
Naked Single: r8c8=1
Naked Single: r9c8=6
Full House: r9c2=7
Naked Single: r2c8=4
Naked Single: r3c8=3
Full House: r5c8=8
Hidden Single: r2c4=9
Hidden... |
normal_sudoku_219 | 9...8...3.4..7..6....2..9..6..9..15.7.4.16..219.....8...78....9..9...5..4....7.1. | 961485723342179865578263941623948157784516392195732486217854639839621574456397218 | Basic 9x9 Sudoku 219 | 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 . . . 3
. 4 . . 7 . . 6 .
. . . 2 . . 9 . .
6 . . 9 . . 1 5 .
7 . 4 . 1 6 . . 2
1 9 . . . . . 8 .
. . 7 8 . . . . 9
. . 9 . . . 5 . .
4 . . . . 7 . 1 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 961485723342179865578263941623948157784516392195732486217854639839621574456397218 #1 Easy (376)
Naked Single: r5c9=2
Naked Single: r5c7=3
Naked Single: r5c4=5
Naked Single: r5c8=9
Full House: r5c2=8
Hidden Single: r2c6=9
Hidden Single: r4c6=8
Hidden Single: r9c5=9
Hidden Single: r4c9=7
Hid... |
normal_sudoku_5304 | ..1...4...7.1.698.6..93........63..1...7.18..7...9.2.35.4...6..1....857.......3.. | 951287436473156982628934157285463791349721865716895243594372618132648579867519324 | Basic 9x9 Sudoku 5304 | 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 . . . 4 . .
. 7 . 1 . 6 9 8 .
6 . . 9 3 . . . .
. . . . 6 3 . . 1
. . . 7 . 1 8 . .
7 . . . 9 . 2 . 3
5 . 4 . . . 6 . .
1 . . . . 8 5 7 .
. . . . . . 3 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 951287436473156982628934157285463791349721865716895243594372618132648579867519324 #1 Hard (656)
Naked Single: r6c7=2
Naked Single: r4c7=7
Full House: r3c7=1
Hidden Single: r6c2=1
Hidden Single: r1c8=3
Hidden Single: r1c5=8
Hidden Single: r9c3=7
Hidden Single: r1c9=6
Hidden Single: r7c5=7
H... |
normal_sudoku_2882 | 2..4.3.7.........4...8......5..4.1.7..27.5.4.47........2.5.7.3...3.9...67...8...2 | 281453679937621584564879321358942167192765843476138295629517438813294756745386912 | Basic 9x9 Sudoku 2882 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 2 . . 4 . 3 . 7 .
. . . . . . . . 4
. . . 8 . . . . .
. 5 . . 4 . 1 . 7
. . 2 7 . 5 . 4 .
4 7 . . . . . . .
. 2 . 5 . 7 . 3 .
. . 3 . 9 . . . 6
7 . . . 8 . . . 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 281453679937621584564879321358942167192765843476138295629517438813294756745386912 #1 Extreme (12030) bf
Hidden Single: r4c9=7
Hidden Single: r8c7=7
Hidden Single: r9c4=3
Hidden Single: r4c1=3
Brute Force: r5c2=9
Grouped Discontinuous Nice Loop: 6 r7c3 -6- r7c5 -1- r5c5 =1= r5c1 =6= r46c3 -6- r7c3 => r... |
normal_sudoku_730 | ......5..5..2.3.....9.4...8..74...8...3..6..7.9..7.24..3.1.98.........1...8.6...2 | 386917524574283961129645738257491683843526197691378245432159876765832419918764352 | Basic 9x9 Sudoku 730 | 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 . .
5 . . 2 . 3 . . .
. . 9 . 4 . . . 8
. . 7 4 . . . 8 .
. . 3 . . 6 . . 7
. 9 . . 7 . 2 4 .
. 3 . 1 . 9 8 . .
. . . . . . . 1 .
. . 8 . 6 . . . 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 386917524574283961129645738257491683843526197691378245432159876765832419918764352 #1 Extreme (13380) bf
Brute Force: r5c3=3
2-String Kite: 3 in r6c9,r8c5 (connected by r4c5,r6c4) => r8c9<>3
Almost Locked Set XY-Wing: A=r5c478 {1589}, B=r12c5 {189}, C=r13689c4 {356789}, X,Y=8,9, Z=1 => r5c5<>1
Forcing Chain ... |
normal_sudoku_5848 | ....7....83.6...7..4.5....9...7.96.5....4.92.96.25..477...2..5...6...29.........4 | 695178432832694571147532869324789615571346928968251347789423156456817293213965784 | Basic 9x9 Sudoku 5848 | 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 3 . 6 . . . 7 .
. 4 . 5 . . . . 9
. . . 7 . 9 6 . 5
. . . . 4 . 9 2 .
9 6 . 2 5 . . 4 7
7 . . . 2 . . 5 .
. . 6 . . . 2 9 .
. . . . . . . . 4 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 695178432832694571147532869324789615571346928968251347789423156456817293213965784 #1 Extreme (26376) bf
Hidden Single: r5c7=9
Hidden Single: r5c6=6
Hidden Single: r3c3=7
Hidden Single: r5c2=7
Hidden Single: r9c5=6
Hidden Single: r8c6=7
Hidden Single: r9c7=7
Hidden Single: r7c9=6
Hidden Single... |
normal_sudoku_324 | 4......7...79..1...5..7...2..5.2..4.8.3..6....4.3....69....58...3.6...2...4.9..1. | 418562973267934185359871462695127348873456291142389756926715834731648529584293617 | Basic 9x9 Sudoku 324 | 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 . . . . . . 7 .
. . 7 9 . . 1 . .
. 5 . . 7 . . . 2
. . 5 . 2 . . 4 .
8 . 3 . . 6 . . .
. 4 . 3 . . . . 6
9 . . . . 5 8 . .
. 3 . 6 . . . 2 .
. . 4 . 9 . . 1 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 418562973267934185359871462695127348873456291142389756926715834731648529584293617 #1 Extreme (18286) bf
Finned Swordfish: 3 r149 c679 fr1c5 => r23c6<>3
Forcing Net Contradiction in r1c6 => r8c6<>1
r8c6=1 (r8c5<>1) r8c3<>1 r8c3=8 r8c5<>8 r8c5=4 (r5c5<>4) (r2c5<>4) (r7c4<>4) r7c5<>4 r7c9=4 r2c9<>4 r2c6=4 (r2c6<>2... |
normal_sudoku_2922 | .2...37....8.7...2..5....6.......4.1..7495....4...2.7....95..3..1...6..78.....6.. | 921643758638579142475218963259367481187495326346182579762951834514836297893724615 | Basic 9x9 Sudoku 2922 | 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 7 . .
. . 8 . 7 . . . 2
. . 5 . . . . 6 .
. . . . . . 4 . 1
. . 7 4 9 5 . . .
. 4 . . . 2 . 7 .
. . . 9 5 . . 3 .
. 1 . . . 6 . . 7
8 . . . . . 6 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 921643758638579142475218963259367481187495326346182579762951834514836297893724615 #1 Extreme (36130) bf
Finned Swordfish: 1 r357 c167 fr3c4 fr3c5 => r2c6<>1
Brute Force: r5c6=5
Hidden Single: r5c1=1
Hidden Single: r1c3=1
Locked Candidates Type 1 (Pointing): 4 in b1 => r78c1<>4
Locked Candidates Type 1... |
normal_sudoku_2887 | .4..762..2.6.5..4.7..2...3.1....74...246..........5.82...5......1..43629...8617.. | 841376295236159847759284136185927463924638571673415982467592318518743629392861754 | Basic 9x9 Sudoku 2887 | 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 . . 7 6 2 . .
2 . 6 . 5 . . 4 .
7 . . 2 . . . 3 .
1 . . . . 7 4 . .
. 2 4 6 . . . . .
. . . . . 5 . 8 2
. . . 5 . . . . .
. 1 . . 4 3 6 2 9
. . . 8 6 1 7 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 841376295236159847759284136185927463924638571673415982467592318518743629392861754 #1 Hard (584)
Naked Single: r8c6=3
Naked Single: r7c8=1
Naked Single: r9c8=5
Naked Single: r8c4=7
Naked Single: r1c8=9
Naked Single: r4c8=6
Full House: r5c8=7
Hidden Single: r4c5=2
Naked Single: r7c5=9
Full H... |
normal_sudoku_1398 | .79..4......2..9..8..963..76...3...145....2.....6.5.4.7.....1...8.7...93.36.1.... | 279154836365287914814963527628439751453871269197625348742396185581742693936518472 | Basic 9x9 Sudoku 1398 | 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 9 . . 4 . . .
. . . 2 . . 9 . .
8 . . 9 6 3 . . 7
6 . . . 3 . . . 1
4 5 . . . . 2 . .
. . . 6 . 5 . 4 .
7 . . . . . 1 . .
. 8 . 7 . . . 9 3
. 3 6 . 1 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 279154836365287914814963527628439751453871269197625348742396185581742693936518472 #1 Unfair (1036)
Hidden Single: r3c4=9
Hidden Single: r4c4=4
Hidden Single: r7c4=3
Hidden Single: r2c2=6
Locked Candidates Type 1 (Pointing): 1 in b5 => r5c3<>1
Locked Candidates Type 2 (Claiming): 4 in r9 => r7c9,r8c7<>... |
normal_sudoku_2140 | ...1.5.3..1..6...47.........7.658.13...2...8.8..4..6..6.1..9...53.....4.......259 | 946185732318762594752934861274658913165293487893471625621549378539827146487316259 | Basic 9x9 Sudoku 2140 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . 1 . 5 . 3 .
. 1 . . 6 . . . 4
7 . . . . . . . .
. 7 . 6 5 8 . 1 3
. . . 2 . . . 8 .
8 . . 4 . . 6 . .
6 . 1 . . 9 . . .
5 3 . . . . . 4 .
. . . . . . 2 5 9 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 946185732318762594752934861274658913165293487893471625621549378539827146487316259 #1 Easy (320)
Naked Single: r4c6=8
Naked Single: r7c8=7
Naked Single: r9c1=4
Naked Single: r7c9=8
Naked Single: r9c2=8
Naked Single: r7c2=2
Naked Single: r7c7=3
Naked Single: r8c7=1
Full House: r8c9=6
Naked S... |
normal_sudoku_3785 | ..56..9.379....6......79.1...2.4...6...3.28...1...6.9.8..5.......4..3..5.5.42.7.. | 125684973798135624346279518982741356567392841413856297839517462274963185651428739 | Basic 9x9 Sudoku 3785 | 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 6 . . 9 . 3
7 9 . . . . 6 . .
. . . . 7 9 . 1 .
. . 2 . 4 . . . 6
. . . 3 . 2 8 . .
. 1 . . . 6 . 9 .
8 . . 5 . . . . .
. . 4 . . 3 . . 5
. 5 . 4 2 . 7 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 125684973798135624346279518982741356567392841413856297839517462274963185651428739 #1 Hard (676)
Hidden Single: r1c7=9
Hidden Single: r2c5=3
Hidden Single: r3c7=5
Hidden Single: r1c8=7
Hidden Single: r2c6=5
Hidden Single: r1c6=4
Locked Candidates Type 1 (Pointing): 4 in b1 => r3c9<>4
Locked Candi... |
normal_sudoku_1548 | 8..3...1.4....2..6....5.4..3295.....17.9.8....68...79..437...8.7....6..2....4.5.. | 856394217437182956912657438329571864174968325568423791243715689795836142681249573 | Basic 9x9 Sudoku 1548 | 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 . . 3 . . . 1 .
4 . . . . 2 . . 6
. . . . 5 . 4 . .
3 2 9 5 . . . . .
1 7 . 9 . 8 . . .
. 6 8 . . . 7 9 .
. 4 3 7 . . . 8 .
7 . . . . 6 . . 2
. . . . 4 . 5 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 856394217437182956912657438329571864174968325568423791243715689795836142681249573 #1 Easy (342)
Naked Single: r4c2=2
Naked Single: r6c1=5
Full House: r5c3=4
Hidden Single: r3c4=6
Hidden Single: r1c6=4
Hidden Single: r8c8=4
Naked Single: r4c8=6
Hidden Single: r6c4=4
Hidden Single: r7c6=5
Hi... |
normal_sudoku_5011 | ..475.3.9165..3...973.2.6....8...........874.45.63.8.....17..3...6..51...1......4 | 824756319165983427973421685738249561692518743451637892589174236246395178317862954 | Basic 9x9 Sudoku 5011 | 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 7 5 . 3 . 9
1 6 5 . . 3 . . .
9 7 3 . 2 . 6 . .
. . 8 . . . . . .
. . . . . 8 7 4 .
4 5 . 6 3 . 8 . .
. . . 1 7 . . 3 .
. . 6 . . 5 1 . .
. 1 . . . . . . 4 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 824756319165983427973421685738249561692518743451637892589174236246395178317862954 #1 Extreme (2324)
Hidden Single: r3c2=7
Hidden Single: r1c6=6
Hidden Single: r9c5=6
Hidden Single: r2c7=4
Hidden Single: r7c9=6
Hidden Single: r1c8=1
Hidden Single: r3c6=1
Hidden Single: r4c8=6
Hidden Single: r5... |
normal_sudoku_1834 | 1....3..........5..6.4..9......468...46.....98..9...2..238..69..8.6..2..6...7.... | 192583764478169352365427981931246875246758139857931426523814697784695213619372548 | Basic 9x9 Sudoku 1834 | 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 . . .
. . . . . . . 5 .
. 6 . 4 . . 9 . .
. . . . 4 6 8 . .
. 4 6 . . . . . 9
8 . . 9 . . . 2 .
. 2 3 8 . . 6 9 .
. 8 . 6 . . 2 . .
6 . . . 7 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 192583764478169352365427981931246875246758139857931426523814697784695213619372548 #1 Extreme (14954) bf
Brute Force: r5c3=6
Hidden Single: r1c8=6
Hidden Single: r6c9=6
Hidden Single: r2c5=6
Hidden Single: r6c7=4
Naked Single: r1c7=7
Locked Candidates Type 1 (Pointing): 4 in b3 => r789c9<>4
AIC: ... |
normal_sudoku_2818 | ..69.3..2.7..6..1..9..4..86168.3..7.3.28..6..7............2..91.....85......7.863 | 416983752873265914295741386168439275352817649749652138587326491634198527921574863 | Basic 9x9 Sudoku 2818 | 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 . 3 . . 2
. 7 . . 6 . . 1 .
. 9 . . 4 . . 8 6
1 6 8 . 3 . . 7 .
3 . 2 8 . . 6 . .
7 . . . . . . . .
. . . . 2 . . 9 1
. . . . . 8 5 . .
. . . . 7 . 8 6 3 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 416983752873265914295741386168439275352817649749652138587326491634198527921574863 #1 Easy (238)
Hidden Single: r3c9=6
Hidden Single: r6c3=9
Hidden Single: r6c7=1
Naked Single: r6c5=5
Naked Single: r6c2=4
Full House: r5c2=5
Naked Single: r6c9=8
Naked Single: r5c8=4
Naked Single: r1c8=5
Nake... |
normal_sudoku_2909 | 85...47...13.564.....9...5.391...6...87..2..1.2..3..7.2..6.8...9.8.......7.59..4. | 859314762713256489462987153391875624587462391624139875235648917948721536176593248 | Basic 9x9 Sudoku 2909 | 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 . . . 4 7 . .
. 1 3 . 5 6 4 . .
. . . 9 . . . 5 .
3 9 1 . . . 6 . .
. 8 7 . . 2 . . 1
. 2 . . 3 . . 7 .
2 . . 6 . 8 . . .
9 . 8 . . . . . .
. 7 . 5 9 . . 4 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 859314762713256489462987153391875624587462391624139875235648917948721536176593248 #1 Easy (274)
Naked Single: r2c2=1
Naked Single: r5c4=4
Naked Single: r9c3=6
Naked Single: r2c1=7
Naked Single: r5c5=6
Naked Single: r9c1=1
Naked Single: r5c1=5
Naked Single: r9c6=3
Naked Single: r6c3=4
Full ... |
normal_sudoku_3561 | .8......16.39...4..72.1.6.5..1.59.7.7...649.....7....6.....23..4..58..6.135.....8 | 584326791613975842972418635361859274758264913249731586896142357427583169135697428 | Basic 9x9 Sudoku 3561 | 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 . . . . . . 1
6 . 3 9 . . . 4 .
. 7 2 . 1 . 6 . 5
. . 1 . 5 9 . 7 .
7 . . . 6 4 9 . .
. . . 7 . . . . 6
. . . . . 2 3 . .
4 . . 5 8 . . 6 .
1 3 5 . . . . . 8 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 584326791613975842972418635361859274758264913249731586896142357427583169135697428 #1 Easy (204)
Naked Single: r2c3=3
Naked Single: r3c1=9
Naked Single: r5c3=8
Naked Single: r1c1=5
Naked Single: r1c3=4
Full House: r2c2=1
Naked Single: r7c1=8
Naked Single: r6c3=9
Naked Single: r8c3=7
Full Ho... |
normal_sudoku_5600 | .8...2.14...54..........6.3.9....1..6.21.5.89..8..9..6.2...8.61..3.........7..4.. | 586372914931546278274891653395687142642135789718429536427958361153264897869713425 | Basic 9x9 Sudoku 5600 | 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 . 1 4
. . . 5 4 . . . .
. . . . . . 6 . 3
. 9 . . . . 1 . .
6 . 2 1 . 5 . 8 9
. . 8 . . 9 . . 6
. 2 . . . 8 . 6 1
. . 3 . . . . . .
. . . 7 . . 4 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 586372914931546278274891653395687142642135789718429536427958361153264897869713425 #1 Extreme (12960) bf
Brute Force: r5c6=5
Hidden Single: r5c2=4
Turbot Fish: 3 r5c5 =3= r5c7 -3- r7c7 =3= r9c8 => r9c5<>3
Forcing Chain Contradiction in c6 => r6c4<>3
r6c4=3 r6c2<>3 r2c2=3 r2c6<>3
r6c4=3 r4c6<>3
r6c4=3 r... |
normal_sudoku_1843 | 38.4..1.....3..85...6..2.4316......9..3........2.6..7.....57.2..9......1....2.... | 385479162429316857716582943164735289873294615952861374631957428297648531548123796 | Basic 9x9 Sudoku 1843 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 3 8 . 4 . . 1 . .
. . . 3 . . 8 5 .
. . 6 . . 2 . 4 3
1 6 . . . . . . 9
. . 3 . . . . . .
. . 2 . 6 . . 7 .
. . . . 5 7 . 2 .
. 9 . . . . . . 1
. . . . 2 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 385479162429316857716582943164735289873294615952861374631957428297648531548123796 #1 Extreme (2932)
Hidden Single: r1c1=3
Hidden Single: r5c8=1
Hidden Single: r8c1=2
Hidden Single: r2c2=2
Hidden Single: r1c9=2
Locked Candidates Type 1 (Pointing): 6 in b2 => r89c6<>6
Locked Candidates Type 1 (Pointi... |
normal_sudoku_1730 | ..394....1.68....9..9651...5.7.96.416.........3...47.....48...........8.8...3..17 | 753942168146873259289651374527396841614728935938514726371485692492167583865239417 | Basic 9x9 Sudoku 1730 | 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 4 . . . .
1 . 6 8 . . . . 9
. . 9 6 5 1 . . .
5 . 7 . 9 6 . 4 1
6 . . . . . . . .
. 3 . . . 4 7 . .
. . . 4 8 . . . .
. . . . . . . 8 .
8 . . . 3 . . 1 7 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 753942168146873259289651374527396841614728935938514726371485692492167583865239417 #1 Easy (326)
Hidden Single: r3c4=6
Hidden Single: r5c6=8
Hidden Single: r8c5=6
Hidden Single: r1c7=1
Hidden Single: r2c6=3
Hidden Single: r6c3=8
Naked Single: r4c2=2
Naked Single: r4c4=3
Full House: r4c7=8
N... |
normal_sudoku_961 | .4....75....13.....295..13....9.5.....2.....38...6...92....14..9........3.6...... | 143289756568137924729546138437925681692814573851763249285391467974658312316472895 | Basic 9x9 Sudoku 961 | 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.
| . 4 . . . . 7 5 .
. . . 1 3 . . . .
. 2 9 5 . . 1 3 .
. . . 9 . 5 . . .
. . 2 . . . . . 3
8 . . . 6 . . . 9
2 . . . . 1 4 . .
9 . . . . . . . .
3 . 6 . . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 143289756568137924729546138437925681692814573851763249285391467974658312316472895 #1 Medium (606)
Hidden Single: r3c8=3
Hidden Single: r5c2=9
Hidden Single: r1c3=3
Hidden Single: r8c7=3
Hidden Single: r8c3=4
Hidden Single: r7c4=3
Hidden Single: r4c2=3
Hidden Single: r1c1=1
Hidden Single: r6c6... |
normal_sudoku_2997 | .54..6...6..5238.......4...8..9..35.2..63....5.12.8..7...1......7...9..1.8..5..9. | 754816239619523874328794615846971352297635148531248967965187423472369581183452796 | Basic 9x9 Sudoku 2997 | 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 4 . . 6 . . .
6 . . 5 2 3 8 . .
. . . . . 4 . . .
8 . . 9 . . 3 5 .
2 . . 6 3 . . . .
5 . 1 2 . 8 . . 7
. . . 1 . . . . .
. 7 . . . 9 . . 1
. 8 . . 5 . . 9 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 754816239619523874328794615846971352297635148531248967965187423472369581183452796 #1 Easy (266)
Naked Single: r6c6=8
Naked Single: r6c5=4
Naked Single: r6c8=6
Naked Single: r6c7=9
Full House: r6c2=3
Hidden Single: r5c6=5
Hidden Single: r4c9=2
Hidden Single: r3c3=8
Naked Single: r3c4=7
Nake... |
normal_sudoku_6844 | ..14...233.......5.9....7.1.68.2..47.7......95.....36.1..67...8...2.591...2.18... | 781459623326781495495362781968523147273146859514897362159674238847235916632918574 | Basic 9x9 Sudoku 6844 | 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 . . . 2 3
3 . . . . . . . 5
. 9 . . . . 7 . 1
. 6 8 . 2 . . 4 7
. 7 . . . . . . 9
5 . . . . . 3 6 .
1 . . 6 7 . . . 8
. . . 2 . 5 9 1 .
. . 2 . 1 8 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 781459623326781495495362781968523147273146859514897362159674238847235916632918574 #1 Easy (208)
Naked Single: r4c9=7
Naked Single: r3c8=8
Naked Single: r4c1=9
Naked Single: r6c9=2
Naked Single: r1c7=6
Naked Single: r2c8=9
Full House: r2c7=4
Naked Single: r5c8=5
Naked Single: r6c3=4
Naked S... |
normal_sudoku_75 | .....23..21..7...59..5..721....1..8.16......2..9.26.7.52...7..6..7....4..9....... | 745192368216873495938564721372415689164789532859326174523947816687251943491638257 | Basic 9x9 Sudoku 75 | 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 . .
2 1 . . 7 . . . 5
9 . . 5 . . 7 2 1
. . . . 1 . . 8 .
1 6 . . . . . . 2
. . 9 . 2 6 . 7 .
5 2 . . . 7 . . 6
. . 7 . . . . 4 .
. 9 . . . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 745192368216873495938564721372415689164789532859326174523947816687251943491638257 #1 Extreme (7862)
Hidden Single: r3c8=2
Hidden Single: r1c4=1
Hidden Single: r6c7=1
Hidden Single: r4c3=2
Hidden Single: r4c7=6
Hidden Single: r5c4=7
Hidden Single: r9c9=7
Hidden Single: r8c6=1
Hidden Single: r6... |
normal_sudoku_6128 | 9.......8.6..9...1.....2...49...53..2.3.46.9..56......3.95..4......29.6..2.4.3... | 912754638765398241834612975497285316283146597156937824379561482541829763628473159 | Basic 9x9 Sudoku 6128 | 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 . . . . . . . 8
. 6 . . 9 . . . 1
. . . . . 2 . . .
4 9 . . . 5 3 . .
2 . 3 . 4 6 . 9 .
. 5 6 . . . . . .
3 . 9 5 . . 4 . .
. . . . 2 9 . 6 .
. 2 . 4 . 3 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 912754638765398241834612975497285316283146597156937824379561482541829763628473159 #1 Extreme (13792) bf
Hidden Single: r4c2=9
Hidden Single: r6c4=9
Hidden Single: r4c9=6
Hidden Single: r7c5=6
Hidden Single: r9c1=6
Hidden Single: r8c9=3
Hidden Single: r4c4=2
Hidden Single: r6c5=3
Brute Force: ... |
normal_sudoku_1103 | .8...5..7......493.....48151.58......3..921....41...3...34...........78.7.1..9... | 489315627517268493362974815125843976638792154974156238893427561246531789751689342 | Basic 9x9 Sudoku 1103 | 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 . . 7
. . . . . . 4 9 3
. . . . . 4 8 1 5
1 . 5 8 . . . . .
. 3 . . 9 2 1 . .
. . 4 1 . . . 3 .
. . 3 4 . . . . .
. . . . . . 7 8 .
7 . 1 . . 9 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 489315627517268493362974815125843976638792154974156238893427561246531789751689342 #1 Easy (490)
Hidden Single: r3c9=5
Hidden Single: r1c1=4
Hidden Single: r4c5=4
Hidden Single: r9c7=3
Hidden Single: r1c5=1
Hidden Single: r2c2=1
Hidden Single: r5c3=8
Naked Single: r5c1=6
Naked Single: r5c9=4
... |
normal_sudoku_2432 | ....36.2.2.....6...5..7..499246.5.3...1.29......3...9.6.....4.....9.2.81.1.4..... | 489136725237594618156278349924685137361729854578341296695813472743962581812457963 | Basic 9x9 Sudoku 2432 | 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 6 . 2 .
2 . . . . . 6 . .
. 5 . . 7 . . 4 9
9 2 4 6 . 5 . 3 .
. . 1 . 2 9 . . .
. . . 3 . . . 9 .
6 . . . . . 4 . .
. . . 9 . 2 . 8 1
. 1 . 4 . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 489136725237594618156278349924685137361729854578341296695813472743962581812457963 #1 Easy (336)
Hidden Single: r4c1=9
Hidden Single: r3c3=6
Hidden Single: r2c5=9
Hidden Single: r9c7=9
Hidden Single: r3c4=2
Hidden Single: r2c8=1
Hidden Single: r8c5=6
Hidden Single: r5c9=4
Hidden Single: r6c5=4... |
normal_sudoku_2956 | 97....2....18....784...7.9......6.3...9..5..1.1.97...41..74...9.9.6.........5.... | 975164283261893547843527196587416932429385671316972854152748369798631425634259718 | Basic 9x9 Sudoku 2956 | 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 7 . . . . 2 . .
. . 1 8 . . . . 7
8 4 . . . 7 . 9 .
. . . . . 6 . 3 .
. . 9 . . 5 . . 1
. 1 . 9 7 . . . 4
1 . . 7 4 . . . 9
. 9 . 6 . . . . .
. . . . 5 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 975164283261893547843527196587416932429385671316972854152748369798631425634259718 #1 Extreme (30822) bf
Hidden Single: r3c6=7
Hidden Single: r4c7=9
Hidden Single: r9c6=9
Hidden Single: r2c5=9
Locked Candidates Type 1 (Pointing): 4 in b5 => r1c4<>4
Locked Candidates Type 1 (Pointing): 7 in b6 => r5c1<>... |
normal_sudoku_1169 | ...18.....8.4.9.....4.5.9..8.691.4....932...7..2.6.19.2...41.....5....1.46.5..2.. | 953182746687439521124756938836917452519324867742865193298641375375298614461573289 | Basic 9x9 Sudoku 1169 | 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 8 . . . .
. 8 . 4 . 9 . . .
. . 4 . 5 . 9 . .
8 . 6 9 1 . 4 . .
. . 9 3 2 . . . 7
. . 2 . 6 . 1 9 .
2 . . . 4 1 . . .
. . 5 . . . . 1 .
4 6 . 5 . . 2 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 953182746687439521124756938836917452519324867742865193298641375375298614461573289 #1 Hard (1408)
Naked Single: r5c5=2
Hidden Single: r8c9=4
Hidden Single: r1c8=4
Hidden Single: r9c3=1
Hidden Single: r7c3=8
Locked Candidates Type 2 (Claiming): 2 in r2 => r13c9,r3c8<>2
Locked Candidates Type 2 (Claim... |
normal_sudoku_713 | 265.1.....4...2..........2.....7.....52.9..713....52.9.....9.15.2.3......9175.3.. | 265417938143982756879536124916278543452693871387145269734829615528361497691754382 | Basic 9x9 Sudoku 713 | 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 6 5 . 1 . . . .
. 4 . . . 2 . . .
. . . . . . . 2 .
. . . . 7 . . . .
. 5 2 . 9 . . 7 1
3 . . . . 5 2 . 9
. . . . . 9 . 1 5
. 2 . 3 . . . . .
. 9 1 7 5 . 3 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 265417938143982756879536124916278543452693871387145269734829615528361497691754382 #1 Extreme (14422) bf
Hidden Single: r1c1=2
Hidden Single: r4c4=2
Hidden Single: r9c9=2
Hidden Single: r8c6=1
Hidden Single: r8c1=5
Hidden Single: r7c5=2
Hidden Single: r5c6=3
Hidden Single: r6c4=1
Locked Candid... |
normal_sudoku_2885 | ..9.4.8...58.7...11..8...6.5..138..6.8.2..5....37...8.3..4...9.9....36...2.9...53 | 269341875458679321137852964592138746781264539643795182315486297974523618826917453 | Basic 9x9 Sudoku 2885 | 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 . 8 . .
. 5 8 . 7 . . . 1
1 . . 8 . . . 6 .
5 . . 1 3 8 . . 6
. 8 . 2 . . 5 . .
. . 3 7 . . . 8 .
3 . . 4 . . . 9 .
9 . . . . 3 6 . .
. 2 . 9 . . . 5 3 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 269341875458679321137852964592138746781264539643795182315486297974523618826917453 #1 Hard (904)
Naked Single: r4c4=1
Naked Single: r8c4=5
Hidden Single: r9c1=8
Hidden Single: r5c8=3
Hidden Single: r1c6=1
Hidden Single: r7c3=5
Hidden Single: r5c3=1
Hidden Single: r8c8=1
Hidden Single: r6c7=1
... |
normal_sudoku_6054 | 8.41..9..15..8..74.79..5........2.8...8.......9.8.6.....1.547.9..79......4.....58 | 824173965156289374379465821615392487438517296792846513281654739567938142943721658 | Basic 9x9 Sudoku 6054 | 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 . 4 1 . . 9 . .
1 5 . . 8 . . 7 4
. 7 9 . . 5 . . .
. . . . . 2 . 8 .
. . 8 . . . . . .
. 9 . 8 . 6 . . .
. . 1 . 5 4 7 . 9
. . 7 9 . . . . .
. 4 . . . . . 5 8 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 824173965156289374379465821615392487438517296792846513281654739567938142943721658 #1 Extreme (13948) bf
Hidden Single: r6c4=8
Hidden Single: r5c8=9
Hidden Single: r2c6=9
Hidden Single: r4c5=9
Hidden Single: r9c1=9
Hidden Single: r1c9=5
Hidden Single: r8c1=5
Hidden Single: r3c7=8
Hidden Single... |
normal_sudoku_2859 | ..6....3.75.9..1.44....892...72..3..325....9.......4.2....5.....7..24...6...7..59 | 296741538758932164413568927947216385325487691861395472132859746579624813684173259 | Basic 9x9 Sudoku 2859 | 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 . . . . 3 .
7 5 . 9 . . 1 . 4
4 . . . . 8 9 2 .
. . 7 2 . . 3 . .
3 2 5 . . . . 9 .
. . . . . . 4 . 2
. . . . 5 . . . .
. 7 . . 2 4 . . .
6 . . . 7 . . 5 9 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 296741538758932164413568927947216385325487691861395472132859746579624813684173259 #1 Easy (386)
Hidden Single: r5c2=2
Hidden Single: r8c1=5
Hidden Single: r4c9=5
Hidden Single: r1c7=5
Hidden Single: r7c8=4
Hidden Single: r7c6=9
Hidden Single: r4c2=4
Hidden Single: r8c3=9
Hidden Single: r3c4=5... |
normal_sudoku_5351 | .1.....4...3..7..94..3..2..1..8....2..4.9.7...5..6..3......28...6..5..2.3..9....1 | 612589347583427169497316285176834592834295716259761438941672853768153924325948671 | Basic 9x9 Sudoku 5351 | 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 .
. . 3 . . 7 . . 9
4 . . 3 . . 2 . .
1 . . 8 . . . . 2
. . 4 . 9 . 7 . .
. 5 . . 6 . . 3 .
. . . . . 2 8 . .
. 6 . . 5 . . 2 .
3 . . 9 . . . . 1 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 612589347583427169497316285176834592834295716259761438941672853768153924325948671 #1 Extreme (24382) bf
Brute Force: r5c5=9
Locked Candidates Type 1 (Pointing): 2 in b5 => r12c4<>2
Discontinuous Nice Loop: 8 r5c8 -8- r6c9 -4- r6c6 -1- r6c7 =1= r5c8 => r5c8<>8
Locked Candidates Type 1 (Pointing): 8 in b6 => ... |
normal_sudoku_2129 | ..279.1.57..15..2..5...2......4..5...16...4..5....9..2.8...16..1.3..78.9...98.23. | 362798145798154326451362987879426513216573498534819762985231674123647859647985231 | Basic 9x9 Sudoku 2129 | 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 9 . 1 . 5
7 . . 1 5 . . 2 .
. 5 . . . 2 . . .
. . . 4 . . 5 . .
. 1 6 . . . 4 . .
5 . . . . 9 . . 2
. 8 . . . 1 6 . .
1 . 3 . . 7 8 . 9
. . . 9 8 . 2 3 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 362798145798154326451362987879426513216573498534819762985231674123647859647985231 #1 Extreme (6496)
Naked Single: r8c7=8
Hidden Single: r3c3=1
Hidden Single: r9c9=1
Locked Candidates Type 1 (Pointing): 9 in b6 => r3c8<>9
Locked Candidates Type 1 (Pointing): 7 in b9 => r7c3<>7
Discontinuous Nice Loop: ... |
normal_sudoku_2911 | ......3...5..3.1.49.....57...82...6.7.38.42...6..1........2...8..6.5.93.3....76.. | 614579382857632194932481576148295763793864251265713849579326418426158937381947625 | Basic 9x9 Sudoku 2911 | 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 . .
. 5 . . 3 . 1 . 4
9 . . . . . 5 7 .
. . 8 2 . . . 6 .
7 . 3 8 . 4 2 . .
. 6 . . 1 . . . .
. . . . 2 . . . 8
. . 6 . 5 . 9 3 .
3 . . . . 7 6 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 614579382857632194932481576148295763793864251265713849579326418426158937381947625 #1 Extreme (3720)
Naked Single: r5c7=2
Hidden Single: r3c2=3
Hidden Single: r5c5=6
Hidden Single: r6c7=8
Locked Candidates Type 2 (Claiming): 8 in r3 => r1c56,r2c6<>8
Locked Candidates Type 2 (Claiming): 5 in r5 => r46c9... |
normal_sudoku_374 | ..4..32.152................24..51.8.7...42.....53..4...6...5328....3.5.4...2...9. | 674983251528174639391526847246751983739842165815369472167495328982637514453218796 | Basic 9x9 Sudoku 374 | 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 2 . 1
5 2 . . . . . . .
. . . . . . . . .
2 4 . . 5 1 . 8 .
7 . . . 4 2 . . .
. . 5 3 . . 4 . .
. 6 . . . 5 3 2 8
. . . . 3 . 5 . 4
. . . 2 . . . 9 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 674983251528174639391526847246751983739842165815369472167495328982637514453218796 #1 Extreme (15402) bf
Hidden Single: r4c2=4
Hidden Single: r6c9=2
Hidden Single: r9c2=5
Hidden Single: r3c5=2
Hidden Single: r8c3=2
2-String Kite: 3 in r3c2,r4c9 (connected by r4c3,r5c2) => r3c9<>3
Forcing Chain Contr... |
normal_sudoku_3721 | 526..1..8..7...6......6..9......38.....12...3.3.84..2....5...7..4..72..19.531.... | 526491738197238645483765192264953817859127463731846529612589374348672951975314286 | Basic 9x9 Sudoku 3721 | 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 6 . . 1 . . 8
. . 7 . . . 6 . .
. . . . 6 . . 9 .
. . . . . 3 8 . .
. . . 1 2 . . . 3
. 3 . 8 4 . . 2 .
. . . 5 . . . 7 .
. 4 . . 7 2 . . 1
9 . 5 3 1 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 526491738197238645483765192264953817859127463731846529612589374348672951975314286 #1 Extreme (3726)
Hidden Single: r1c3=6
Hidden Single: r9c2=7
Hidden Single: r2c2=9
Locked Candidates Type 1 (Pointing): 2 in b7 => r7c79<>2
Locked Candidates Type 1 (Pointing): 4 in b8 => r23c6<>4
2-String Kite: 1 in r2... |
normal_sudoku_1103 | 37..9.2.....8...35.152..9.7....24........8..1.......7..21..97....9.3..5.53.7.1... | 378596214492817635615243987157324896263978541984165372821459763749632158536781429 | Basic 9x9 Sudoku 1103 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 3 7 . . 9 . 2 . .
. . . 8 . . . 3 5
. 1 5 2 . . 9 . 7
. . . . 2 4 . . .
. . . . . 8 . . 1
. . . . . . . 7 .
. 2 1 . . 9 7 . .
. . 9 . 3 . . 5 .
5 3 . 7 . 1 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 378596214492817635615243987157324896263978541984165372821459763749632158536781429 #1 Extreme (2556)
Hidden Single: r3c9=7
Hidden Single: r3c6=3
Hidden Single: r7c9=3
Hidden Single: r5c5=7
Hidden Single: r8c1=7
Hidden Single: r8c7=1
Hidden Single: r1c8=1
Hidden Single: r8c6=2
Hidden Single: r2... |
normal_sudoku_1669 | 4...2.1....23...57.1.......92....681...8..4....8..23.58.92...3...4.738.6.6...47.. | 493725168682341957517698243925437681136859472748162395879216534254973816361584729 | Basic 9x9 Sudoku 1669 | 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 . . . 2 . 1 . .
. . 2 3 . . . 5 7
. 1 . . . . . . .
9 2 . . . . 6 8 1
. . . 8 . . 4 . .
. . 8 . . 2 3 . 5
8 . 9 2 . . . 3 .
. . 4 . 7 3 8 . 6
. 6 . . . 4 7 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 493725168682341957517698243925437681136859472748162395879216534254973816361584729 #1 Easy (204)
Naked Single: r4c9=1
Naked Single: r2c1=6
Naked Single: r2c7=9
Naked Single: r8c2=5
Naked Single: r7c7=5
Full House: r3c7=2
Naked Single: r7c9=4
Naked Single: r1c8=6
Naked Single: r2c2=8
Naked S... |
normal_sudoku_333 | 5.6.7...9.3184..56....9..1....21.....6...45...2.....83..7......6.81.7....9..5.... | 586371249931842756472596318845213697763984521129765483217439865658127934394658172 | Basic 9x9 Sudoku 333 | 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 . 7 . . . 9
. 3 1 8 4 . . 5 6
. . . . 9 . . 1 .
. . . 2 1 . . . .
. 6 . . . 4 5 . .
. 2 . . . . . 8 3
. . 7 . . . . . .
6 . 8 1 . 7 . . .
. 9 . . 5 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 586371249931842756472596318845213697763984521129765483217439865658127934394658172 #1 Hard (1520)
Naked Single: r2c4=8
Naked Single: r6c5=6
Naked Single: r1c4=3
Naked Single: r2c6=2
Naked Single: r1c6=1
Naked Single: r2c7=7
Full House: r2c1=9
Hidden Single: r7c2=1
Hidden Single: r3c7=3
Hidd... |
normal_sudoku_1013 | .1..392..7..2..1....2..1.6..2.4..8..1.7.58...4.8.23.....17.54......9..51.....2.86 | 816539247735246198942871563329467815167958324458123679691785432283694751574312986 | Basic 9x9 Sudoku 1013 | 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 . . 3 9 2 . .
7 . . 2 . . 1 . .
. . 2 . . 1 . 6 .
. 2 . 4 . . 8 . .
1 . 7 . 5 8 . . .
4 . 8 . 2 3 . . .
. . 1 7 . 5 4 . .
. . . . 9 . . 5 1
. . . . . 2 . 8 6 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 816539247735246198942871563329467815167958324458123679691785432283694751574312986 #1 Extreme (2244)
Hidden Single: r6c5=2
Hidden Single: r3c5=7
Hidden Single: r4c6=7
Hidden Single: r8c1=2
Locked Candidates Type 1 (Pointing): 4 in b2 => r2c2389<>4
Locked Candidates Type 1 (Pointing): 7 in b9 => r6c7<>7... |
normal_sudoku_1223 | .9265...85....36........5....4.65..3.......7...832..........4...768....1.5..9..8. | 192654738547283619683719524724165893315948276968327145839571462476832951251496387 | Basic 9x9 Sudoku 1223 | 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 2 6 5 . . . 8
5 . . . . 3 6 . .
. . . . . . 5 . .
. . 4 . 6 5 . . 3
. . . . . . . 7 .
. . 8 3 2 . . . .
. . . . . . 4 . .
. 7 6 8 . . . . 1
. 5 . . 9 . . 8 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 192654738547283619683719524724165893315948276968327145839571462476832951251496387 #1 Hard (628)
Hidden Single: r1c5=5
Hidden Single: r5c3=5
Hidden Single: r7c4=5
Hidden Single: r4c7=8
Hidden Single: r8c8=5
Hidden Single: r7c3=9
Hidden Single: r6c9=5
Hidden Single: r8c7=9
Naked Single: r6c7=1
... |
normal_sudoku_1805 | 3..481..6....7..9...25.61.....7.83...9..64...4......6.2..8.9..1.1..538....8..7.3. | 359481726186372495742596183625718349893264517471935268237849651914653872568127934 | Basic 9x9 Sudoku 1805 | 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 8 1 . . 6
. . . . 7 . . 9 .
. . 2 5 . 6 1 . .
. . . 7 . 8 3 . .
. 9 . . 6 4 . . .
4 . . . . . . 6 .
2 . . 8 . 9 . . 1
. 1 . . 5 3 8 . .
. . 8 . . 7 . 3 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 359481726186372495742596183625718349893264517471935268237849651914653872568127934 #1 Easy (418)
Naked Single: r3c6=6
Naked Single: r7c5=4
Naked Single: r2c6=2
Full House: r6c6=5
Naked Single: r2c4=3
Full House: r3c5=9
Hidden Single: r1c3=9
Hidden Single: r6c4=9
Hidden Single: r3c9=3
Hidden... |
normal_sudoku_4700 | 6..5..9...53....6.1.9..4....61....3.4...5...99.5.3.....1.47..96...2895.4..4...3.. | 647521983253897461189364752761948235438152679925736148512473896376289514894615327 | Basic 9x9 Sudoku 4700 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 6 . . 5 . . 9 . .
. 5 3 . . . . 6 .
1 . 9 . . 4 . . .
. 6 1 . . . . 3 .
4 . . . 5 . . . 9
9 . 5 . 3 . . . .
. 1 . 4 7 . . 9 6
. . . 2 8 9 5 . 4
. . 4 . . . 3 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 647521983253897461189364752761948235438152679925736148512473896376289514894615327 #1 Easy (388)
Naked Single: r7c5=7
Hidden Single: r5c2=3
Naked Single: r8c2=7
Naked Single: r8c1=3
Naked Single: r8c3=6
Full House: r8c8=1
Hidden Single: r4c5=4
Hidden Single: r9c2=9
Hidden Single: r4c9=5
Hid... |
normal_sudoku_790 | 56..381.........93....6....83..7.5..9..1.3......8.532...4....311....7.6.68.3..754 | 567938142248751693391264875832476519975123486416895327754689231123547968689312754 | Basic 9x9 Sudoku 790 | 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 6 . . 3 8 1 . .
. . . . . . . 9 3
. . . . 6 . . . .
8 3 . . 7 . 5 . .
9 . . 1 . 3 . . .
. . . 8 . 5 3 2 .
. . 4 . . . . 3 1
1 . . . . 7 . 6 .
6 8 . 3 . . 7 5 4 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 567938142248751693391264875832476519975123486416895327754689231123547968689312754 #1 Easy (284)
Naked Single: r9c8=5
Hidden Single: r2c7=6
Hidden Single: r4c8=1
Hidden Single: r3c1=3
Hidden Single: r8c3=3
Hidden Single: r3c9=5
Hidden Single: r2c3=8
Hidden Single: r5c3=5
Hidden Single: r5c9=6
... |
normal_sudoku_3952 | 6..8......9.........42.6.......3..65.61...39.3.5..91.4.1.......5.6...4.9.395.4.16 | 627893541893145627154276938942731865761458392385629174418967253576312489239584716 | Basic 9x9 Sudoku 3952 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 6 . . 8 . . . . .
. 9 . . . . . . .
. . 4 2 . 6 . . .
. . . . 3 . . 6 5
. 6 1 . . . 3 9 .
3 . 5 . . 9 1 . 4
. 1 . . . . . . .
5 . 6 . . . 4 . 9
. 3 9 5 . 4 . 1 6 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 627893541893145627154276938942731865761458392385629174418967253576312489239584716 #1 Extreme (14274) bf
Hidden Single: r6c1=3
Hidden Single: r4c2=4
Hidden Single: r4c1=9
Hidden Single: r7c4=9
Hidden Single: r7c1=4
Hidden Single: r2c7=6
Hidden Single: r7c5=6
Hidden Single: r6c4=6
Locked Candid... |
normal_sudoku_2620 | ........9..65...8.9.74.....3........7.89.6....6173.....7..9.3.1.1.....68..3..897. | 584162739136579284927483516392841657758926143461735892875694321219357468643218975 | Basic 9x9 Sudoku 2620 | 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
. . 6 5 . . . 8 .
9 . 7 4 . . . . .
3 . . . . . . . .
7 . 8 9 . 6 . . .
. 6 1 7 3 . . . .
. 7 . . 9 . 3 . 1
. 1 . . . . . 6 8
. . 3 . . 8 9 7 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 584162739136579284927483516392841657758926143461735892875694321219357468643218975 #1 Extreme (27338) bf
Hidden Single: r5c1=7
Hidden Single: r2c6=9
Hidden Single: r6c7=8
Hidden Single: r7c1=8
Hidden Single: r6c8=9
Hidden Single: r8c3=9
Hidden Single: r4c2=9
Hidden Single: r7c4=6
Hidden Single... |
normal_sudoku_1427 | ..81.9.......3....19.5..6..8.....2..6..38..1..5...6.......9.42.....4....7..26.385 | 468129753527634198193578642831957264674382519952416837386795421215843976749261385 | Basic 9x9 Sudoku 1427 | 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 1 . 9 . . .
. . . . 3 . . . .
1 9 . 5 . . 6 . .
8 . . . . . 2 . .
6 . . 3 8 . . 1 .
. 5 . . . 6 . . .
. . . . 9 . 4 2 .
. . . . 4 . . . .
7 . . 2 6 . 3 8 5 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 468129753527634198193578642831957264674382519952416837386795421215843976749261385 #1 Easy (304)
Naked Single: r9c4=2
Naked Single: r9c6=1
Naked Single: r9c2=4
Full House: r9c3=9
Hidden Single: r1c2=6
Hidden Single: r2c4=6
Hidden Single: r4c5=5
Hidden Single: r6c1=9
Hidden Single: r5c7=5
Na... |
normal_sudoku_5903 | .5.62...46.............19...7....2..4.5.....8..8.5..7..1..8.5.75..2.34...4.175..2 | 751629384694538721832741956173896245425317698968452173216984537587263419349175862 | Basic 9x9 Sudoku 5903 | 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 . 6 2 . . . 4
6 . . . . . . . .
. . . . . 1 9 . .
. 7 . . . . 2 . .
4 . 5 . . . . . 8
. . 8 . 5 . . 7 .
. 1 . . 8 . 5 . 7
5 . . 2 . 3 4 . .
. 4 . 1 7 5 . . 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 751629384694538721832741956173896245425317698968452173216984537587263419349175862 #1 Extreme (2756)
Hidden Single: r8c1=5
Hidden Single: r4c8=4
Hidden Single: r8c3=7
Hidden Single: r4c9=5
Locked Candidates Type 2 (Claiming): 4 in c5 => r2c46,r3c4<>4
Hidden Pair: 2,5 in r23c8 => r2c8<>1, r23c8<>3, r23c... |
normal_sudoku_5013 | 14.93...8..74..9..3.2..8......58..6.87.3....1...217.8..2..4..5..........41...3..7 | 146935278587462913392178645231584769874396521659217384723849156968751432415623897 | Basic 9x9 Sudoku 5013 | 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 3 . . . 8
. . 7 4 . . 9 . .
3 . 2 . . 8 . . .
. . . 5 8 . . 6 .
8 7 . 3 . . . . 1
. . . 2 1 7 . 8 .
. 2 . . 4 . . 5 .
. . . . . . . . .
4 1 . . . 3 . . 7 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 146935278587462913392178645231584769874396521659217384723849156968751432415623897 #1 Unfair (1362)
Naked Single: r4c4=5
Hidden Single: r3c2=9
Naked Single: r4c2=3
Hidden Single: r2c2=8
Hidden Single: r4c1=2
Hidden Single: r4c3=1
Hidden Single: r4c7=7
Hidden Single: r1c8=7
Locked Candidates Ty... |
normal_sudoku_851 | ..2.3.64.4.........8..46..5...9..4.8.....596..9..8.57.3..12.....74.59..6......1.. | 952831647436597812781246395517963428248715963693482571369128754174359286825674139 | Basic 9x9 Sudoku 851 | 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 . 6 4 .
4 . . . . . . . .
. 8 . . 4 6 . . 5
. . . 9 . . 4 . 8
. . . . . 5 9 6 .
. 9 . . 8 . 5 7 .
3 . . 1 2 . . . .
. 7 4 . 5 9 . . 6
. . . . . . 1 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 952831647436597812781246395517963428248715963693482571369128754174359286825674139 #1 Extreme (1916)
Naked Single: r8c5=5
Hidden Single: r5c2=4
Hidden Single: r2c5=9
Hidden Single: r8c1=1
Locked Candidates Type 1 (Pointing): 1 in b2 => r46c6<>1
Locked Candidates Type 1 (Pointing): 8 in b3 => r2c46<>8
... |
normal_sudoku_5617 | ....7.1....6..48....7....3.8..3.6.4....71..86.....83.1..4.8....95..3.4..6..4...7. | 295873164136524897487169235819356742543712986762948351374285619951637428628491573 | Basic 9x9 Sudoku 5617 | 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 . 1 . .
. . 6 . . 4 8 . .
. . 7 . . . . 3 .
8 . . 3 . 6 . 4 .
. . . 7 1 . . 8 6
. . . . . 8 3 . 1
. . 4 . 8 . . . .
9 5 . . 3 . 4 . .
6 . . 4 . . . 7 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 295873164136524897487169235819356742543712986762948351374285619951637428628491573 #1 Extreme (25032) bf
Hidden Single: r5c8=8
Hidden Single: r1c6=3
Hidden Single: r6c2=6
Hidden Single: r3c5=6
Hidden Single: r6c5=4
Hidden Single: r2c9=7
Hidden Single: r8c6=7
Hidden Single: r4c7=7
Hidden Single... |
normal_sudoku_728 | ..63....5....4.......7..91.51.2..49..2.83..........7288..69..7...1.7..59.7..28... | 796381245152946387384752916518267493427839561639514728843695172261473859975128634 | Basic 9x9 Sudoku 728 | 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 3 . . . . 5
. . . . 4 . . . .
. . . 7 . . 9 1 .
5 1 . 2 . . 4 9 .
. 2 . 8 3 . . . .
. . . . . . 7 2 8
8 . . 6 9 . . 7 .
. . 1 . 7 . . 5 9
. 7 . . 2 8 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 796381245152946387384752916518267493427839561639514728843695172261473859975128634 #1 Hard (962)
Naked Single: r4c4=2
Naked Single: r5c8=6
Naked Single: r4c5=6
Naked Single: r8c4=4
Naked Single: r4c9=3
Naked Single: r5c9=1
Full House: r5c7=5
Naked Single: r4c6=7
Full House: r4c3=8
Naked Sin... |
normal_sudoku_3924 | .5..78.1..8..24..9..43..8...4..3...1..8..73..57.....6..6....1.........9...7.8.2.. | 352978416786124539194365827249536781618497352573812964865249173421753698937681245 | Basic 9x9 Sudoku 3924 | 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 . . 7 8 . 1 .
. 8 . . 2 4 . . 9
. . 4 3 . . 8 . .
. 4 . . 3 . . . 1
. . 8 . . 7 3 . .
5 7 . . . . . 6 .
. 6 . . . . 1 . .
. . . . . . . 9 .
. . 7 . 8 . 2 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 352978416786124539194365827249536781618497352573812964865249173421753698937681245 #1 Extreme (28572) bf
Brute Force: r6c2=7
Hidden Single: r6c3=3
Locked Candidates Type 1 (Pointing): 3 in b1 => r789c1<>3
Locked Candidates Type 1 (Pointing): 1 in b4 => r5c45<>1
XY-Wing: 4/6/9 in r1c47,r6c7 => r6c4<>9
F... |
normal_sudoku_5820 | .3...4.2...41.236.2..6..4...6..4..3215..87.94...3..71.8.9...........61...1..2..7. | 736894521584172369291635487967541832153287694428369715849713256372956148615428973 | Basic 9x9 Sudoku 5820 | 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 . . . 4 . 2 .
. . 4 1 . 2 3 6 .
2 . . 6 . . 4 . .
. 6 . . 4 . . 3 2
1 5 . . 8 7 . 9 4
. . . 3 . . 7 1 .
8 . 9 . . . . . .
. . . . . 6 1 . .
. 1 . . 2 . . 7 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 736894521584172369291635487967541832153287694428369715849713256372956148615428973 #1 Hard (774)
Naked Single: r5c8=9
Naked Single: r5c4=2
Naked Single: r5c7=6
Full House: r5c3=3
Hidden Single: r4c6=1
Hidden Single: r6c5=6
Hidden Single: r7c5=1
Hidden Single: r7c7=2
Hidden Single: r7c9=6
Hi... |
normal_sudoku_5088 | ....8..5.4....59.....3.9..2....642...7.2183....65..184.4....7....8..1.9391....8.. | 639182457421675938857349612183964275574218369296537184345896721768421593912753846 | Basic 9x9 Sudoku 5088 | 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 .
4 . . . . 5 9 . .
. . . 3 . 9 . . 2
. . . . 6 4 2 . .
. 7 . 2 1 8 3 . .
. . 6 5 . . 1 8 4
. 4 . . . . 7 . .
. . 8 . . 1 . 9 3
9 1 . . . . 8 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 639182457421675938857349612183964275574218369296537184345896721768421593912753846 #1 Easy (258)
Naked Single: r6c7=1
Naked Single: r5c8=6
Naked Single: r5c1=5
Naked Single: r4c8=7
Naked Single: r5c9=9
Full House: r4c9=5
Full House: r5c3=4
Naked Single: r4c4=9
Naked Single: r9c9=6
Naked Sin... |
normal_sudoku_2706 | 67..3...1..2..6...5..9..4....7.6..2.9..4..1...5...3..8..5.1...3.6...8.5.7.....8.. | 679534281142786395538921476317869524986452137254173968895217643461398752723645819 | Basic 9x9 Sudoku 2706 | 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 7 . . 3 . . . 1
. . 2 . . 6 . . .
5 . . 9 . . 4 . .
. . 7 . 6 . . 2 .
9 . . 4 . . 1 . .
. 5 . . . 3 . . 8
. . 5 . 1 . . . 3
. 6 . . . 8 . 5 .
7 . . . . . 8 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 679534281142786395538921476317869524986452137254173968895217643461398752723645819 #1 Extreme (25096) bf
Forcing Net Verity => r2c2<>8
r1c3=4 r1c3<>9 r2c2=9 r2c2<>8
r6c3=4 r6c3<>6 r5c3=6 r5c3<>8 r13c3=8 r2c2<>8
r8c3=4 (r6c3<>4) (r7c1<>4) (r7c2<>4) r1c3<>4 r1c6=4 (r2c5<>4) r7c6<>4 r7c8=4 r6c8<>4 r6c1=4 r2c1<>4 r... |
normal_sudoku_2589 | ..4.3.65..9............5..4...3....6.68..1..24....2..7...6..7..9...53.41..512.8.. | 124739658597486123683215974259378416768541392431962587812694735976853241345127869 | Basic 9x9 Sudoku 2589 | 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 . 6 5 .
. 9 . . . . . . .
. . . . . 5 . . 4
. . . 3 . . . . 6
. 6 8 . . 1 . . 2
4 . . . . 2 . . 7
. . . 6 . . 7 . .
9 . . . 5 3 . 4 1
. . 5 1 2 . 8 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 124739658597486123683215974259378416768541392431962587812694735976853241345127869 #1 Hard (690)
Naked Single: r8c9=1
Naked Single: r8c7=2
Hidden Single: r6c5=6
Hidden Single: r2c6=6
Hidden Single: r8c3=6
Hidden Single: r9c8=6
Hidden Single: r2c1=5
Hidden Single: r7c9=5
Hidden Single: r3c1=6
... |
normal_sudoku_1371 | 2.7.39......61..2..19....73..48..26.8...5...4.7..6..8.4..7...5..2......6.3..8.1.. | 287439615543617928619528473154873269896152734372964581468791352721345896935286147 | Basic 9x9 Sudoku 1371 | 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 . 3 9 . . .
. . . 6 1 . . 2 .
. 1 9 . . . . 7 3
. . 4 8 . . 2 6 .
8 . . . 5 . . . 4
. 7 . . 6 . . 8 .
4 . . 7 . . . 5 .
. 2 . . . . . . 6
. 3 . . 8 . 1 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 287439615543617928619528473154873269896152734372964581468791352721345896935286147 #1 Hard (722)
2-String Kite: 3 in r5c8,r7c6 (connected by r7c7,r8c8) => r5c6<>3
Empty Rectangle: 4 in b9 (r38c5) => r3c8<>4
Naked Single: r3c8=7
Hidden Single: r2c6=7
Hidden Single: r4c5=7
Hidden Single: r5c7=7
Hidden... |
normal_sudoku_62 | 1..897....3...1.7.7....6.8...1...5.8..2....3.8...5.2.4......3..25.1....63.4..2... | 145897623638521479729346185491273568562418937873659214916785342257134896384962751 | Basic 9x9 Sudoku 62 | 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 7 . . .
. 3 . . . 1 . 7 .
7 . . . . 6 . 8 .
. . 1 . . . 5 . 8
. . 2 . . . . 3 .
8 . . . 5 . 2 . 4
. . . . . . 3 . .
2 5 . 1 . . . . 6
3 . 4 . . 2 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 145897623638521479729346185491273568562418937873659214916785342257134896384962751 #1 Unfair (1430)
Hidden Single: r1c6=7
Hidden Single: r2c3=8
Hidden Single: r5c1=5
Hidden Single: r6c8=1
Hidden Single: r5c5=1
Hidden Single: r6c3=3
Naked Single: r6c6=9
Hidden Single: r1c9=3
Hidden Single: r7c6... |
normal_sudoku_555 | 2..1.46......5..121..2..3.46...41..3..3.624.....3......81.....9.....7...3..4..2.. | 238194657946753812157286394625841973793562481814379526481625739562937148379418265 | Basic 9x9 Sudoku 555 | 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 . 4 6 . .
. . . . 5 . . 1 2
1 . . 2 . . 3 . 4
6 . . . 4 1 . . 3
. . 3 . 6 2 4 . .
. . . 3 . . . . .
. 8 1 . . . . . 9
. . . . . 7 . . .
3 . . 4 . . 2 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 238194657946753812157286394625841973793562481814379526481625739562937148379418265 #1 Extreme (17788) bf
Hidden Single: r2c9=2
Hidden Single: r7c5=2
Hidden Pair: 3,4 in r78c8 => r78c8<>5, r78c8<>6, r7c8<>7, r8c8<>8
Locked Candidates Type 2 (Claiming): 6 in r7 => r8c4,r9c6<>6
Brute Force: r6c1=8
Locked ... |
normal_sudoku_5186 | .9....3.75.....1.474.1...2..3.2..7......53.4.9....8....7.4....1....8.2..6.9...... | 291845367563972184748136529836294715127653948954718632372469851415387296689521473 | Basic 9x9 Sudoku 5186 | 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 . 7
5 . . . . . 1 . 4
7 4 . 1 . . . 2 .
. 3 . 2 . . 7 . .
. . . . 5 3 . 4 .
9 . . . . 8 . . .
. 7 . 4 . . . . 1
. . . . 8 . 2 . .
6 . 9 . . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 291845367563972184748136529836294715127653948954718632372469851415387296689521473 #1 Extreme (27440) bf
Locked Candidates Type 1 (Pointing): 3 in b1 => r78c3<>3
Locked Candidates Type 1 (Pointing): 4 in b7 => r8c8<>4
Hidden Rectangle: 6/7 in r5c34,r6c34 => r5c3<>6
Brute Force: r5c8=4
Hidden Single: r9c7=... |
normal_sudoku_283 | .89...6..14..8......597..4...4.9..2.95...8..7..37...9.5.......1..1..598...8.19... | 289154673147386259635972148714593826956428317823761594592837461371645982468219735 | Basic 9x9 Sudoku 283 | 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 . . . 6 . .
1 4 . . 8 . . . .
. . 5 9 7 . . 4 .
. . 4 . 9 . . 2 .
9 5 . . . 8 . . 7
. . 3 7 . . . 9 .
5 . . . . . . . 1
. . 1 . . 5 9 8 .
. . 8 . 1 9 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 289154673147386259635972148714593826956428317823761594592837461371645982468219735 #1 Extreme (2032)
Hidden Single: r5c1=9
Hidden Single: r2c9=9
Hidden Single: r7c4=8
Hidden Single: r7c2=9
Hidden Single: r7c6=7
Hidden Single: r2c3=7
Hidden Single: r1c8=7
Hidden Single: r9c7=7
Hidden Single: r5... |
normal_sudoku_575 | ..72...3.2.......438...9.....1.5.....6.9...8...3..67....2.9...51..3...2.....246.. | 957248136216573894384619572891457263765932481423186759672891345148365927539724618 | Basic 9x9 Sudoku 575 | 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 . . . 3 .
2 . . . . . . . 4
3 8 . . . 9 . . .
. . 1 . 5 . . . .
. 6 . 9 . . . 8 .
. . 3 . . 6 7 . .
. . 2 . 9 . . . 5
1 . . 3 . . . 2 .
. . . . 2 4 6 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 957248136216573894384619572891457263765932481423186759672891345148365927539724618 #1 Extreme (26646) bf
Hidden Single: r9c5=2
Locked Candidates Type 1 (Pointing): 8 in b4 => r79c1<>8
2-String Kite: 6 in r1c1,r8c5 (connected by r7c1,r8c3) => r1c5<>6
Grouped Discontinuous Nice Loop: 8 r9c4 -8- r9c3 =8= r8c3 =... |
normal_sudoku_2808 | .6..8......95.6....3.4..5....2....7.....7.1621..8..3.4..319..........943....2..8. | 561287439429536718738419526392641875854973162176852394683194257215768943947325681 | Basic 9x9 Sudoku 2808 | 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 . . 8 . . . .
. . 9 5 . 6 . . .
. 3 . 4 . . 5 . .
. . 2 . . . . 7 .
. . . . 7 . 1 6 2
1 . . 8 . . 3 . 4
. . 3 1 9 . . . .
. . . . . . 9 4 3
. . . . 2 . . 8 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 561287439429536718738419526392641875854973162176852394683194257215768943947325681 #1 Easy (384)
Naked Single: r6c7=3
Naked Single: r3c5=1
Naked Single: r4c7=8
Naked Single: r2c5=3
Hidden Single: r3c9=6
Hidden Single: r6c6=2
Hidden Single: r1c4=2
Hidden Single: r4c5=4
Hidden Single: r9c9=1
... |
normal_sudoku_429 | 8....2..7..5.1.2...4...7.3..2...45.....29..6...1.5......7..93...3.62..4.2.4.....8 | 813462957675913284942587631326874519758291463491356872587149326139628745264735198 | Basic 9x9 Sudoku 429 | 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 . . 7
. . 5 . 1 . 2 . .
. 4 . . . 7 . 3 .
. 2 . . . 4 5 . .
. . . 2 9 . . 6 .
. . 1 . 5 . . . .
. . 7 . . 9 3 . .
. 3 . 6 2 . . 4 .
2 . 4 . . . . . 8 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 813462957675913284942587631326874519758291463491356872587149326139628745264735198 #1 Extreme (3510)
Hidden Single: r1c6=2
Hidden Single: r8c7=7
Hidden Single: r3c3=2
Locked Candidates Type 1 (Pointing): 5 in b2 => r79c4<>5
Locked Candidates Type 2 (Claiming): 7 in r5 => r46c1,r6c2<>7
Hidden Pair: 5,7 ... |
normal_sudoku_4890 | 2.....1....6.2...4.7.5...6...7.3..9.6..9.25...9...5..11....87....8.4.....6.3...1. | 235496187916827354874513962527134896681972543493685271149268735358741629762359418 | Basic 9x9 Sudoku 4890 | 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 . .
. . 6 . 2 . . . 4
. 7 . 5 . . . 6 .
. . 7 . 3 . . 9 .
6 . . 9 . 2 5 . .
. 9 . . . 5 . . 1
1 . . . . 8 7 . .
. . 8 . 4 . . . .
. 6 . 3 . . . 1 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 235496187916827354874513962527134896681972543493685271149268735358741629762359418 #1 Extreme (11130) bf
X-Wing: 1 c35 r35 => r35c6,r5c2<>1
Finned Swordfish: 5 r248 c128 fr8c9 => r7c8<>5
Brute Force: r5c6=2
Finned Swordfish: 2 r349 c279 fr9c3 => r78c2<>2
Hidden Single: r4c2=2
Hidden Single: r2c2=1
H... |
normal_sudoku_6349 | 5......8..318.....8.7...4.1.1.....3.38.....577.5.....44....75.....69.7.8.....4..3 | 542716389931842675867953421619475832384269157725138964498327516253691748176584293 | Basic 9x9 Sudoku 6349 | 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 . . . . . . 8 .
. 3 1 8 . . . . .
8 . 7 . . . 4 . 1
. 1 . . . . . 3 .
3 8 . . . . . 5 7
7 . 5 . . . . . 4
4 . . . . 7 5 . .
. . . 6 9 . 7 . 8
. . . . . 4 . . 3 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 542716389931842675867953421619475832384269157725138964498327516253691748176584293 #1 Extreme (15822) bf
Hidden Single: r3c1=8
Hidden Single: r1c2=4
Hidden Single: r2c9=5
Hidden Single: r2c8=7
Hidden Single: r9c2=7
Hidden Single: r2c5=4
Hidden Single: r8c8=4
Hidden Single: r1c7=3
Hidden Single... |
normal_sudoku_3455 | 7....1.25.1.24.8.7..8..541...3.....1..6...2..............18.5...825.41..5....7.4. | 749831625615249837238765419853472961976318254124956783467183592382594176591627348 | Basic 9x9 Sudoku 3455 | 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 . . . . 1 . 2 5
. 1 . 2 4 . 8 . 7
. . 8 . . 5 4 1 .
. . 3 . . . . . 1
. . 6 . . . 2 . .
. . . . . . . . .
. . . 1 8 . 5 . .
. 8 2 5 . 4 1 . .
5 . . . . 7 . 4 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 749831625615249837238765419853472961976318254124956783467183592382594176591627348 #1 Extreme (30026) bf
Hidden Single: r3c8=1
Hidden Single: r1c4=8
Hidden Single: r2c3=5
Hidden Single: r9c3=1
Hidden Single: r8c8=7
Hidden Single: r9c9=8
Hidden Single: r9c5=2
Hidden Single: r7c9=2
Brute Force: ... |
normal_sudoku_1967 | .6.....7....24.56.4....7..1.147....8..3..4...7...8...43....1..5.59.........59.2.. | 865139472137248569492657831914762358583914726726385914378421695259876143641593287 | Basic 9x9 Sudoku 1967 | 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 . . . . . 7 .
. . . 2 4 . 5 6 .
4 . . . . 7 . . 1
. 1 4 7 . . . . 8
. . 3 . . 4 . . .
7 . . . 8 . . . 4
3 . . . . 1 . . 5
. 5 9 . . . . . .
. . . 5 9 . 2 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 865139472137248569492657831914762358583914726726385914378421695259876143641593287 #1 Extreme (18182) bf
Hidden Single: r2c5=4
Hidden Single: r1c7=4
Locked Candidates Type 1 (Pointing): 1 in b2 => r1c13<>1
Locked Candidates Type 1 (Pointing): 8 in b3 => r3c234<>8
Forcing Net Contradiction in r4 => r2c6<>9... |
normal_sudoku_4712 | .....3..4......8.96..8...2.....7...82.65.49...1.6...5...21...8.15......386...7... | 728913564541762839693845721935271648286534917417698352372159486159486273864327195 | Basic 9x9 Sudoku 4712 | 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
. . . . . . 8 . 9
6 . . 8 . . . 2 .
. . . . 7 . . . 8
2 . 6 5 . 4 9 . .
. 1 . 6 . . . 5 .
. . 2 1 . . . 8 .
1 5 . . . . . . 3
8 6 . . . 7 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 728913564541762839693845721935271648286534917417698352372159486159486273864327195 #1 Extreme (26572) bf
Brute Force: r5c3=6
Hidden Single: r7c9=6
Hidden Pair: 6,8 in r8c56 => r8c56<>2, r8c5<>4, r8c56<>9
Grouped Discontinuous Nice Loop: 2 r6c5 -2- r6c9 -7- r5c89 =7= r5c2 =8= r1c2 =2= r2c2 -2- r2c6 =2= r46c6 ... |
normal_sudoku_4181 | .83...9.54...932.....5.8.34......32...9.345.88..2.5.4.318.......6.8.........5.... | 783462915451793286692518734145689327279134568836275149318947652567821493924356871 | Basic 9x9 Sudoku 4181 | 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 3 . . . 9 . 5
4 . . . 9 3 2 . .
. . . 5 . 8 . 3 4
. . . . . . 3 2 .
. . 9 . 3 4 5 . 8
8 . . 2 . 5 . 4 .
3 1 8 . . . . . .
. 6 . 8 . . . . .
. . . . 5 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 783462915451793286692518734145689327279134568836275149318947652567821493924356871 #1 Extreme (14194) bf
Hidden Single: r3c8=3
Hidden Single: r2c8=8
Hidden Single: r6c2=3
Hidden Single: r6c9=9
Hidden Single: r4c5=8
Hidden Single: r9c7=8
Hidden Single: r9c4=3
Hidden Single: r7c8=5
Hidden Single... |
normal_sudoku_2944 | 57........2..7......3..57.2..5..19....17.36.44..8....1..651....9...3.1.......9..6 | 579124863624378519813965742365241987281793654497856231736512498948637125152489376 | Basic 9x9 Sudoku 2944 | 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 7 . . . . . . .
. 2 . . 7 . . . .
. . 3 . . 5 7 . 2
. . 5 . . 1 9 . .
. . 1 7 . 3 6 . 4
4 . . 8 . . . . 1
. . 6 5 1 . . . .
9 . . . 3 . 1 . .
. . . . . 9 . . 6 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 579124863624378519813965742365241987281793654497856231736512498948637125152489376 #1 Extreme (24518) bf
Almost Locked Set XZ-Rule: A=r1c345679 {1234689}, B=r34589c4 {124679}, X=1, Z=6 => r2c4<>6
Brute Force: r5c4=7
Locked Candidates Type 1 (Pointing): 9 in b5 => r13c5<>9
Naked Triple: 2,4,6 in r4c45,r6c6 =>... |
normal_sudoku_314 | .9.2....1..6....3.71...86..67..3....85.9.......148756..6...18......4..761.......2 | 593264781486719235712358694679135428854926317321487569267591843935842176148673952 | Basic 9x9 Sudoku 314 | 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 . 2 . . . . 1
. . 6 . . . . 3 .
7 1 . . . 8 6 . .
6 7 . . 3 . . . .
8 5 . 9 . . . . .
. . 1 4 8 7 5 6 .
. 6 . . . 1 8 . .
. . . . 4 . . 7 6
1 . . . . . . . 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 593264781486719235712358694679135428854926317321487569267591843935842176148673952 #1 Unfair (952)
Naked Single: r6c4=4
Hidden Single: r9c4=6
Hidden Single: r8c7=1
Hidden Single: r8c4=8
Locked Candidates Type 1 (Pointing): 4 in b4 => r1379c3<>4
Locked Candidates Type 2 (Claiming): 4 in r3 => r1c78,r2c7... |
normal_sudoku_6627 | .4.7....2..5....7.....3.4..8...1..2..9.28.7.......3.69.2.6.1.4...83.....1...5.... | 349768152685124973712539486873916524496285731251473869527691348968347215134852697 | Basic 9x9 Sudoku 6627 | 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 . 7 . . . . 2
. . 5 . . . . 7 .
. . . . 3 . 4 . .
8 . . . 1 . . 2 .
. 9 . 2 8 . 7 . .
. . . . . 3 . 6 9
. 2 . 6 . 1 . 4 .
. . 8 3 . . . . .
1 . . . 5 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 349768152685124973712539486873916524496285731251473869527691348968347215134852697 #1 Extreme (11344) bf
Brute Force: r5c5=8
Hidden Single: r6c7=8
Hidden Single: r7c9=8
Locked Candidates Type 1 (Pointing): 6 in b5 => r123c6<>6
Locked Candidates Type 1 (Pointing): 1 in b6 => r5c3<>1
XYZ-Wing: 3/5/9 in r... |
normal_sudoku_1171 | ..5...1.2.7.2...59......74...763......4.2....1..9..2.......24.1.21498.755.....9.. | 635749182478216359912853746297635814864127593153984267789562431321498675546371928 | Basic 9x9 Sudoku 1171 | 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 . . . 1 . 2
. 7 . 2 . . . 5 9
. . . . . . 7 4 .
. . 7 6 3 . . . .
. . 4 . 2 . . . .
1 . . 9 . . 2 . .
. . . . . 2 4 . 1
. 2 1 4 9 8 . 7 5
5 . . . . . 9 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 635749182478216359912853746297635814864127593153984267789562431321498675546371928 #1 Extreme (8014)
Hidden Single: r5c5=2
Hidden Single: r4c1=2
Hidden Single: r9c8=2
Hidden Single: r3c3=2
Hidden Single: r3c2=1
Hidden Single: r9c2=4
Hidden Single: r7c1=7
Hidden Single: r7c3=9
Naked Triple: 3,6... |
normal_sudoku_1950 | 5....72....845..6..6.....5.6...1..42.....4.76......1..4..9.1...2....64...36.4...9 | 513867294928453761764192358697315842351284976842679135475921683289536417136748529 | Basic 9x9 Sudoku 1950 | 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 . . . . 7 2 . .
. . 8 4 5 . . 6 .
. 6 . . . . . 5 .
6 . . . 1 . . 4 2
. . . . . 4 . 7 6
. . . . . . 1 . .
4 . . 9 . 1 . . .
2 . . . . 6 4 . .
. 3 6 . 4 . . . 9 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 513867294928453761764192358697315842351284976842679135475921683289536417136748529 #1 Extreme (29838) bf
Hidden Single: r9c5=4
Hidden Single: r7c7=6
Brute Force: r5c4=2
Hidden Pair: 2,4 in r6c23 => r6c23<>5, r6c23<>7, r6c2<>8, r6c23<>9, r6c3<>3
Grouped Discontinuous Nice Loop: 5 r4c4 -5- r8c4 =5= r9c46 -5... |
normal_sudoku_1490 | 6.4.....9..5.9..6.3...6...2.6.1.73.......6.5...3.4....4.6..92.3.52..46..9......4. | 624758139715293468398461572569127384247836951183945726476589213852314697931672845 | Basic 9x9 Sudoku 1490 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 6 . 4 . . . . . 9
. . 5 . 9 . . 6 .
3 . . . 6 . . . 2
. 6 . 1 . 7 3 . .
. . . . . 6 . 5 .
. . 3 . 4 . . . .
4 . 6 . . 9 2 . 3
. 5 2 . . 4 6 . .
9 . . . . . . 4 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 624758139715293468398461572569127384247836951183945726476589213852314697931672845 #1 Extreme (25070) bf
Hidden Single: r1c1=6
Hidden Single: r5c2=4
Hidden Single: r1c8=3
Hidden Single: r9c9=5
Hidden Single: r9c2=3
Hidden Single: r6c9=6
Hidden Single: r9c4=6
Hidden Single: r8c8=9
Hidden Single... |
normal_sudoku_2918 | 6.5...12.4......6...2.....515.8.97..2..5..6...4.......5....7..47..1..2....1..657. | 685934127419725368372618495156849732238571649947362851563287914794153286821496573 | Basic 9x9 Sudoku 2918 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 6 . 5 . . . 1 2 .
4 . . . . . . 6 .
. . 2 . . . . . 5
1 5 . 8 . 9 7 . .
2 . . 5 . . 6 . .
. 4 . . . . . . .
5 . . . . 7 . . 4
7 . . 1 . . 2 . .
. . 1 . . 6 5 7 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 685934127419725368372618495156849732238571649947362851563287914794153286821496573 #1 Extreme (13552) bf
Hidden Single: r4c2=5
Hidden Single: r3c7=4
Hidden Single: r7c8=1
Hidden Single: r8c3=4
Hidden Single: r8c9=6
Hidden Single: r6c8=5
Hidden Single: r7c2=6
Hidden Single: r9c2=2
Brute Force: ... |
normal_sudoku_379 | .3..1.8...68...4..5....8..3.5...3..89......2...67.......5..9..6....712.....4..18. | 239514867168937452547268913452193678971685324386742591815329746694871235723456189 | Basic 9x9 Sudoku 379 | 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 . . 1 . 8 . .
. 6 8 . . . 4 . .
5 . . . . 8 . . 3
. 5 . . . 3 . . 8
9 . . . . . . 2 .
. . 6 7 . . . . .
. . 5 . . 9 . . 6
. . . . 7 1 2 . .
. . . 4 . . 1 8 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 239514867168937452547268913452193678971685324386742591815329746694871235723456189 #1 Extreme (20218) bf
Hidden Single: r1c7=8
Locked Candidates Type 2 (Claiming): 5 in c7 => r56c9,r6c8<>5
Brute Force: r5c6=5
Hidden Single: r6c7=5
2-String Kite: 3 in r6c1,r7c7 (connected by r5c7,r6c8) => r7c1<>3
Empty ... |
normal_sudoku_2780 | 5.218...46....91......7...2.29.5.4.3.......56.....4.....3..2....41.....8...3.79.. | 592186734637429185418573692129658473374291856856734219963812547741965328285347961 | Basic 9x9 Sudoku 2780 | 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 . 2 1 8 . . . 4
6 . . . . 9 1 . .
. . . . 7 . . . 2
. 2 9 . 5 . 4 . 3
. . . . . . . 5 6
. . . . . 4 . . .
. . 3 . . 2 . . .
. 4 1 . . . . . 8
. . . 3 . 7 9 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 592186734637429185418573692129658473374291856856734219963812547741965328285347961 #1 Medium (834)
Hidden Single: r1c3=2
Hidden Single: r7c4=8
Hidden Single: r6c9=9
Locked Triple: 5,6,9 in r8c456 => r7c5,r8c1<>9, r8c7<>5, r79c5,r8c78<>6
Locked Candidates Type 1 (Pointing): 6 in b4 => r6c45<>6
Hidden Si... |
normal_sudoku_6896 | .68..9..2.......7..1.....4.8..39...6..3267.....2..8.....69.2517..9..6.837...5.... | 568479132924183675317625948845391726193267854672548391486932517259716483731854269 | Basic 9x9 Sudoku 6896 | 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 . . 9 . . 2
. . . . . . . 7 .
. 1 . . . . . 4 .
8 . . 3 9 . . . 6
. . 3 2 6 7 . . .
. . 2 . . 8 . . .
. . 6 9 . 2 5 1 7
. . 9 . . 6 . 8 3
7 . . . 5 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 568479132924183675317625948845391726193267854672548391486932517259716483731854269 #1 Unfair (1322)
Naked Single: r7c8=1
Hidden Single: r6c1=6
Hidden Single: r9c8=6
Hidden Single: r3c3=7
Hidden Single: r4c8=2
Locked Candidates Type 2 (Claiming): 9 in c8 => r5c79,r6c79<>9
Naked Triple: 1,4,5 in r6c45... |
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