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_2377 | 87.5.6......2......193....6...4....1...93...52...5..9..5674..82..48..6........7.. | 872516439563294178419387526935472861687931245241658397156743982794825613328169754 | Basic 9x9 Sudoku 2377 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 8 7 . 5 . 6 . . .
. . . 2 . . . . .
. 1 9 3 . . . . 6
. . . 4 . . . . 1
. . . 9 3 . . . 5
2 . . . 5 . . 9 .
. 5 6 7 4 . . 8 2
. . 4 8 . . 6 . .
. . . . . . 7 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 872516439563294178419387526935472861687931245241658397156743982794825613328169754 #1 Extreme (4400)
Naked Single: r3c4=3
Hidden Single: r1c3=2
Hidden Single: r8c1=7
Locked Candidates Type 1 (Pointing): 3 in b1 => r2c789<>3
Locked Candidates Type 1 (Pointing): 5 in b9 => r23c8<>5
Locked Candidates Type... |
normal_sudoku_3466 | 3....79.6.86..4...57..6..2.2...1..734..3..2..1...7.56..257...1.....5..9.7....16.. | 312587946986124735574963128259618473467395281138472569625739814841256397793841652 | Basic 9x9 Sudoku 3466 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 3 . . . . 7 9 . 6
. 8 6 . . 4 . . .
5 7 . . 6 . . 2 .
2 . . . 1 . . 7 3
4 . . 3 . . 2 . .
1 . . . 7 . 5 6 .
. 2 5 7 . . . 1 .
. . . . 5 . . 9 .
7 . . . . 1 6 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 312587946986124735574963128259618473467395281138472569625739814841256397793841652 #1 Easy (274)
Naked Single: r1c1=3
Naked Single: r5c8=8
Naked Single: r2c1=9
Naked Single: r4c7=4
Naked Single: r5c5=9
Naked Single: r6c9=9
Full House: r5c9=1
Naked Single: r5c3=7
Naked Single: r6c2=3
Naked S... |
normal_sudoku_5036 | .6.3.....2.1.7.3...37..2.8..5...9...1.37..9......1...........348..23..5.3.5..72.. | 568394721241578369937162485756429813183756942429813576672985134894231657315647298 | Basic 9x9 Sudoku 5036 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . 6 . 3 . . . . .
2 . 1 . 7 . 3 . .
. 3 7 . . 2 . 8 .
. 5 . . . 9 . . .
1 . 3 7 . . 9 . .
. . . . 1 . . . .
. . . . . . . 3 4
8 . . 2 3 . . 5 .
3 . 5 . . 7 2 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 568394721241578369937162485756429813183756942429813576672985134894231657315647298 #1 Extreme (18812) bf
Hidden Single: r9c1=3
Hidden Single: r4c9=3
Hidden Single: r6c6=3
Brute Force: r5c8=4
Grouped Discontinuous Nice Loop: 4 r1c5 -4- r2c46 =4= r2c2 -4- r9c2 =4= r8c23 -4- r8c6 =4= r12c6 -4- r1c5 => r1c5<>... |
normal_sudoku_1280 | ...217.....5.9..4.2.....39..64......5..8....3.3.97..2......92..6...4..7.4......38 | 943217685875396142216458397764132859529864713138975426351789264682543971497621538 | Basic 9x9 Sudoku 1280 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . 2 1 7 . . .
. . 5 . 9 . . 4 .
2 . . . . . 3 9 .
. 6 4 . . . . . .
5 . . 8 . . . . 3
. 3 . 9 7 . . 2 .
. . . . . 9 2 . .
6 . . . 4 . . 7 .
4 . . . . . . 3 8 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 943217685875396142216458397764132859529864713138975426351789264682543971497621538 #1 Hard (1194)
Hidden Single: r2c5=9
Hidden Single: r2c9=2
Hidden Single: r3c4=4
Hidden Single: r1c2=4
Hidden Single: r7c9=4
Locked Pair: 1,8 in r6c13 => r4c1,r5c23,r6c679<>1, r4c1,r6c7<>8
Locked Triple: 5,6,8 in r1c7... |
normal_sudoku_331 | ..15..9.24...2.......3.15.419....4....81...5......7..124..1.....164.5...8.5...... | 631584972457926813982371564193652487728149356564837291249718635316495728875263149 | Basic 9x9 Sudoku 331 | 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 5 . . 9 . 2
4 . . . 2 . . . .
. . . 3 . 1 5 . 4
1 9 . . . . 4 . .
. . 8 1 . . . 5 .
. . . . . 7 . . 1
2 4 . . 1 . . . .
. 1 6 4 . 5 . . .
8 . 5 . . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 631584972457926813982371564193652487728149356564837291249718635316495728875263149 #1 Extreme (22754) bf
Hidden Single: r4c1=1
Hidden Single: r6c3=4
Hidden Single: r9c8=4
Hidden Single: r2c2=5
Hidden Single: r7c9=5
Hidden Single: r4c5=5
Hidden Single: r6c1=5
Hidden Single: r9c7=1
Hidden Single... |
normal_sudoku_1479 | .....1.....3.4...712.....9....8.......7.6...39.....28..4.3.7..5..54.6.3.....5..4. | 479521368583649127126783594652834971817962453934175286248397615795416832361258749 | Basic 9x9 Sudoku 1479 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . . . 1 . . .
. . 3 . 4 . . . 7
1 2 . . . . . 9 .
. . . 8 . . . . .
. . 7 . 6 . . . 3
9 . . . . . 2 8 .
. 4 . 3 . 7 . . 5
. . 5 4 . 6 . 3 .
. . . . 5 . . 4 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 479521368583649127126783594652834971817962453934175286248397615795416832361258749 #1 Extreme (17538) bf
Hidden Single: r8c4=4
Hidden Single: r4c8=7
Locked Candidates Type 1 (Pointing): 7 in b1 => r1c45<>7
Brute Force: r5c2=1
Naked Single: r5c8=5
Hidden Single: r5c1=8
Locked Candidates Type 1 (Point... |
normal_sudoku_2669 | 6......9..2...4.63..9.6.5....3.2..862.6..8..4.8..4.....6...2.75....7....7..51.... | 647835291125794863839261547453129786276358914981647352364982175518473629792516438 | Basic 9x9 Sudoku 2669 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 6 . . . . . . 9 .
. 2 . . . 4 . 6 3
. . 9 . 6 . 5 . .
. . 3 . 2 . . 8 6
2 . 6 . . 8 . . 4
. 8 . . 4 . . . .
. 6 . . . 2 . 7 5
. . . . 7 . . . .
7 . . 5 1 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 647835291125794863839261547453129786276358914981647352364982175518473629792516438 #1 Extreme (18428) bf
Hidden Single: r1c1=6
Brute Force: r5c8=1
Hidden Single: r6c8=5
Locked Candidates Type 1 (Pointing): 3 in b6 => r789c7<>3
2-String Kite: 5 in r1c6,r5c2 (connected by r4c6,r5c5) => r1c2<>5
Forcing Ch... |
normal_sudoku_2222 | .3.18.4.....4.9.1.14..238...7....2..6......48.14....75.8.3.4.97...2..3......7..8. | 539187426826459713147623859978546231652731948314892675281364597795218364463975182 | Basic 9x9 Sudoku 2222 | 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 8 . 4 . .
. . . 4 . 9 . 1 .
1 4 . . 2 3 8 . .
. 7 . . . . 2 . .
6 . . . . . . 4 8
. 1 4 . . . . 7 5
. 8 . 3 . 4 . 9 7
. . . 2 . . 3 . .
. . . . 7 . . 8 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 539187426826459713147623859978546231652731948314892675281364597795218364463975182 #1 Easy (418)
Hidden Single: r3c2=4
Hidden Single: r4c5=4
Hidden Single: r2c7=7
Hidden Single: r2c9=3
Hidden Single: r4c8=3
Hidden Single: r8c6=8
Hidden Single: r1c8=2
Hidden Single: r9c9=2
Hidden Single: r3c8=5... |
normal_sudoku_885 | 4..27.1....1.3.........5.6.95.4..2..1..56.98...8.....5.147...2.7.........29..17.. | 436278159571639842892145367953487216147562983268913475314796528785324691629851734 | Basic 9x9 Sudoku 885 | 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 7 . 1 . .
. . 1 . 3 . . . .
. . . . . 5 . 6 .
9 5 . 4 . . 2 . .
1 . . 5 6 . 9 8 .
. . 8 . . . . . 5
. 1 4 7 . . . 2 .
7 . . . . . . . .
. 2 9 . . 1 7 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 436278159571639842892145367953487216147562983268913475314796528785324691629851734 #1 Extreme (30956) bf
Forcing Net Contradiction in r8 => r2c9<>9
r2c9=9 (r2c8<>9 r8c8=9 r8c8<>5) (r2c9<>7) r2c9<>2 r2c1=2 (r2c1<>5 r1c3=5 r8c3<>5) (r2c1<>5) (r3c1<>2) r3c3<>2 r3c9=2 r3c9<>7 r2c8=7 r2c8<>5 r2c7=5 r8c7<>5 r8c5=5 r8c5<>... |
normal_sudoku_920 | ..4.6.2..6.....89.92......1716..29....915...2..2..4....9...7....37.....4....4.1.. | 874961253651423897923578461716832945349156782582794316495217638137689524268345179 | Basic 9x9 Sudoku 920 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . 4 . 6 . 2 . .
6 . . . . . 8 9 .
9 2 . . . . . . 1
7 1 6 . . 2 9 . .
. . 9 1 5 . . . 2
. . 2 . . 4 . . .
. 9 . . . 7 . . .
. 3 7 . . . . . 4
. . . . 4 . 1 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 874961253651423897923578461716832945349156782582794316495217638137689524268345179 #1 Extreme (2080)
Hidden Single: r5c3=9
Hidden Single: r9c2=6
Hidden Single: r4c8=4
Hidden Single: r9c9=9
Hidden Single: r2c4=4
Hidden Single: r7c1=4
Hidden Single: r5c2=4
Hidden Single: r6c8=1
Hidden Single: r3... |
normal_sudoku_149 | ....63.........968.5.82...4..3..6.....85.4.1......2.9...5....4...42157.67.....2.1 | 841963572372451968659827134413796825298534617567182493125678349934215786786349251 | Basic 9x9 Sudoku 149 | 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 . . .
. . . . . . 9 6 8
. 5 . 8 2 . . . 4
. . 3 . . 6 . . .
. . 8 5 . 4 . 1 .
. . . . . 2 . 9 .
. . 5 . . . . 4 .
. . 4 2 1 5 7 . 6
7 . . . . . 2 . 1 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 841963572372451968659827134413796825298534617567182493125678349934215786786349251 #1 Extreme (2556)
Hidden Single: r6c6=2
Hidden Single: r2c5=5
Hidden Single: r9c8=5
Hidden Single: r7c9=9
Hidden Single: r9c5=4
Locked Candidates Type 1 (Pointing): 2 in b3 => r1c123<>2
Hidden Single: r2c3=2
Locked... |
normal_sudoku_5413 | ......5.....925...1.58.......3...1.421...7.53.54...72.3.....2.5.72.3..4.54.1..... | 986413572437925816125876439793258164218647953654391728361784295872539641549162387 | Basic 9x9 Sudoku 5413 | 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 . .
. . . 9 2 5 . . .
1 . 5 8 . . . . .
. . 3 . . . 1 . 4
2 1 . . . 7 . 5 3
. 5 4 . . . 7 2 .
3 . . . . . 2 . 5
. 7 2 . 3 . . 4 .
5 4 . 1 . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 986413572437925816125876439793258164218647953654391728361784295872539641549162387 #1 Extreme (15788) bf
Hidden Single: r1c7=5
Hidden Single: r4c1=7
Hidden Single: r8c4=5
Hidden Single: r4c5=5
Hidden Single: r8c9=1
Hidden Single: r7c3=1
Hidden Single: r9c6=2
Hidden Single: r4c4=2
Hidden Single... |
normal_sudoku_1309 | ...2.915.5..13...2....7.3.93.........8...3....6....5379...1..2..3.5.291...1...7.5 | 673249158594138672218675349352967481187453296469821537945716823736582914821394765 | Basic 9x9 Sudoku 1309 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . 2 . 9 1 5 .
5 . . 1 3 . . . 2
. . . . 7 . 3 . 9
3 . . . . . . . .
. 8 . . . 3 . . .
. 6 . . . . 5 3 7
9 . . . 1 . . 2 .
. 3 . 5 . 2 9 1 .
. . 1 . . . 7 . 5 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 673249158594138672218675349352967481187453296469821537945716823736582914821394765 #1 Extreme (35310) bf
Hidden Single: r6c8=3
Hidden Single: r1c3=3
Hidden Single: r3c6=5
Hidden Single: r2c8=7
Hidden Single: r7c9=3
Hidden Single: r9c4=3
Hidden Single: r9c5=9
Locked Candidates Type 1 (Pointing): 8... |
normal_sudoku_1054 | .5....16...8.91.....7.6...3..951.6....2....5..4...6.1.2.1....473.....9....4.8.... | 953874162628391475417265893739518624162943758845726319281639547376452981594187236 | Basic 9x9 Sudoku 1054 | 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 . . . . 1 6 .
. . 8 . 9 1 . . .
. . 7 . 6 . . . 3
. . 9 5 1 . 6 . .
. . 2 . . . . 5 .
. 4 . . . 6 . 1 .
2 . 1 . . . . 4 7
3 . . . . . 9 . .
. . 4 . 8 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 953874162628391475417265893739518624162943758845726319281639547376452981594187236 #1 Hard (1194)
Naked Single: r3c3=7
Naked Single: r1c3=3
Naked Single: r6c3=5
Full House: r8c3=6
Hidden Single: r3c6=5
Hidden Single: r3c8=9
Hidden Single: r2c4=3
Hidden Single: r9c1=5
Hidden Single: r7c4=6
H... |
normal_sudoku_1793 | ..59.1......68..7.9467.......43...8..9.1.6542.7.............83.....2...4.17...... | 785931426123684975946752318264395781398176542571248693652419837839527164417863259 | Basic 9x9 Sudoku 1793 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . 5 9 . 1 . . .
. . . 6 8 . . 7 .
9 4 6 7 . . . . .
. . 4 3 . . . 8 .
. 9 . 1 . 6 5 4 2
. 7 . . . . . . .
. . . . . . 8 3 .
. . . . 2 . . . 4
. 1 7 . . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 785931426123684975946752318264395781398176542571248693652419837839527164417863259 #1 Easy (304)
Naked Single: r5c8=4
Naked Single: r5c5=7
Hidden Single: r1c1=7
Hidden Single: r3c9=8
Hidden Single: r6c4=2
Hidden Single: r7c5=1
Hidden Single: r1c2=8
Hidden Single: r6c6=8
Hidden Single: r9c5=6
... |
normal_sudoku_5986 | ..23...547...54...54..129..6.7........4..1.27.1....8....5.2..31.7...3...3..1..... | 192386754786954312543712986657238149834691527219475863965827431471563298328149675 | Basic 9x9 Sudoku 5986 | 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 . . . 5 4
7 . . . 5 4 . . .
5 4 . . 1 2 9 . .
6 . 7 . . . . . .
. . 4 . . 1 . 2 7
. 1 . . . . 8 . .
. . 5 . 2 . . 3 1
. 7 . . . 3 . . .
3 . . 1 . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 192386754786954312543712986657238149834691527219475863965827431471563298328149675 #1 Extreme (12672) bf
Hidden Single: r3c1=5
Grouped Discontinuous Nice Loop: 9 r4c4 -9- r4c89 =9= r6c89 -9- r6c1 -2- r6c4 =2= r4c4 => r4c4<>9
Forcing Net Contradiction in c4 => r4c4<>8
r4c4=8 r4c4<>4
r4c4=8 r4c4<>2 r4c2=2 r6c... |
normal_sudoku_1755 | .15...8.......6.1.26....7.48.6..794.3.........9.62....1..27.3.5...35..2.5.3..81.. | 915742836437586219268913754856137942342895671791624583184279365679351428523468197 | Basic 9x9 Sudoku 1755 | 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 . . . 8 . .
. . . . . 6 . 1 .
2 6 . . . . 7 . 4
8 . 6 . . 7 9 4 .
3 . . . . . . . .
. 9 . 6 2 . . . .
1 . . 2 7 . 3 . 5
. . . 3 5 . . 2 .
5 . 3 . . 8 1 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 915742836437586219268913754856137942342895671791624583184279365679351428523468197 #1 Easy (258)
Naked Single: r4c1=8
Naked Single: r6c7=5
Naked Single: r2c7=2
Naked Single: r5c7=6
Full House: r8c7=4
Hidden Single: r1c6=2
Hidden Single: r7c8=6
Hidden Single: r9c5=6
Hidden Single: r8c1=6
Hid... |
normal_sudoku_1815 | .32....7..1...9.83..837.2.13...4......1.5.......7.18...2.1...97..7......89..3.... | 632518974714269583958374261379846125281953746546721839423185697167492358895637412 | Basic 9x9 Sudoku 1815 | 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 2 . . . . 7 .
. 1 . . . 9 . 8 3
. . 8 3 7 . 2 . 1
3 . . . 4 . . . .
. . 1 . 5 . . . .
. . . 7 . 1 8 . .
. 2 . 1 . . . 9 7
. . 7 . . . . . .
8 9 . . 3 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 632518974714269583958374261379846125281953746546721839423185697167492358895637412 #1 Extreme (26812) bf
Hidden Single: r1c2=3
Hidden Single: r1c5=1
Hidden Single: r2c1=7
Hidden Single: r9c6=7
Hidden Single: r8c9=8
Hidden Single: r8c1=1
Hidden Single: r3c1=9
Hidden Single: r6c8=3
Hidden Single... |
normal_sudoku_618 | ...1..536...786.............2.41......1...8..6.95.82........41..7..52..3.5.3..... | 897124536315786924462935178528419367741263859639578241283697415174852693956341782 | Basic 9x9 Sudoku 618 | 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 6
. . . 7 8 6 . . .
. . . . . . . . .
. 2 . 4 1 . . . .
. . 1 . . . 8 . .
6 . 9 5 . 8 2 . .
. . . . . . 4 1 .
. 7 . . 5 2 . . 3
. 5 . 3 . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 897124536315786924462935178528419367741263859639578241283697415174852693956341782 #1 Hard (948)
Naked Single: r6c4=5
Hidden Single: r6c9=1
Hidden Single: r8c1=1
Hidden Single: r9c6=1
Hidden Single: r4c7=3
Hidden Single: r7c9=5
Hidden Single: r3c6=5
Hidden Single: r8c3=4
Hidden Single: r9c5=4
... |
normal_sudoku_2350 | 64...9.5...74.....1...6.......3....89...4..2..6..52.....4.....7...8..3...1..2..9. | 648239751527481639139567482452396178973148526861752943384915267296874315715623894 | Basic 9x9 Sudoku 2350 | puzzles5_forum_hardest_1905_11+ | Each row, column, and 3×3 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 .
. . 7 4 . . . . .
1 . . . 6 . . . .
. . . 3 . . . . 8
9 . . . 4 . . 2 .
. 6 . . 5 2 . . .
. . 4 . . . . . 7
. . . 8 . . 3 . .
. 1 . . 2 . . 9 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 648239751527481639139567482452396178973148526861752943384915267296874315715623894 #1 Extreme (39452) bf
Locked Candidates Type 1 (Pointing): 8 in b5 => r5c23<>8
Brute Force: r5c5=4
Hidden Single: r5c6=8
Brute Force: r5c4=1
Hidden Single: r4c6=6
Discontinuous Nice Loop: 9 r3c7 -9- r3c3 =9= r8c3 =6= r9c... |
normal_sudoku_5523 | ..314.2...5..9.........6.3781.4....3..4...51.32....4......7...6..28..3..9......5. | 683147295157293684249586137816452973794638512325719468431975826572861349968324751 | Basic 9x9 Sudoku 5523 | 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 4 . 2 . .
. 5 . . 9 . . . .
. . . . . 6 . 3 7
8 1 . 4 . . . . 3
. . 4 . . . 5 1 .
3 2 . . . . 4 . .
. . . . 7 . . . 6
. . 2 8 . . 3 . .
9 . . . . . . 5 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 683147295157293684249586137816452973794638512325719468431975826572861349968324751 #1 Extreme (14246) bf
Locked Candidates Type 1 (Pointing): 4 in b3 => r2c1<>4
Almost Locked Set XZ-Rule: A=r1c1 {67}, B=r2c3789 {14678}, X=7, Z=6 => r2c1<>6
Brute Force: r5c7=5
Hidden Single: r1c9=5
Locked Candidates Type 1... |
normal_sudoku_1610 | ....2...9745.9.6.1......4...6..89.722....51.....7.....5.6.3.....1..579....4...3.. | 631524789745893621928671435463189572287345196159762843576938214312457968894216357 | Basic 9x9 Sudoku 1610 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . . 2 . . . 9
7 4 5 . 9 . 6 . 1
. . . . . . 4 . .
. 6 . . 8 9 . 7 2
2 . . . . 5 1 . .
. . . 7 . . . . .
5 . 6 . 3 . . . .
. 1 . . 5 7 9 . .
. . 4 . . . 3 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 631524789745893621928671435463189572287345196159762843576938214312457968894216357 #1 Unfair (700)
Naked Single: r2c5=9
Naked Single: r4c7=5
Naked Single: r6c7=8
Naked Single: r1c7=7
Full House: r7c7=2
Hidden Single: r2c8=2
Hidden Single: r6c6=2
Hidden Single: r6c2=5
Hidden Single: r3c5=7
H... |
normal_sudoku_1160 | ..93.6......8...41..3....2...8....3.9...61..84.17.....5..17..8.3.2.5.....6.4..... | 149326857256897341783514926678945132935261478421783569594172683312658794867439215 | Basic 9x9 Sudoku 1160 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . 9 3 . 6 . . .
. . . 8 . . . 4 1
. . 3 . . . . 2 .
. . 8 . . . . 3 .
9 . . . 6 1 . . 8
4 . 1 7 . . . . .
5 . . 1 7 . . 8 .
3 . 2 . 5 . . . .
. 6 . 4 . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 149326857256897341783514926678945132935261478421783569594172683312658794867439215 #1 Medium (344)
Naked Single: r7c1=5
Naked Single: r7c3=4
Naked Single: r9c3=7
Naked Single: r7c2=9
Naked Single: r5c3=5
Full House: r2c3=6
Naked Single: r5c4=2
Naked Single: r5c8=7
Naked Single: r1c8=5
Naked... |
normal_sudoku_2652 | ......6..3....8........7.855..24..9.19....5...8.....147...6......2.......5647..23 | 978524631325618749641397285563241897194783562287956314739162458412835976856479123 | Basic 9x9 Sudoku 2652 | 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 . . . . 8 . . .
. . . . . 7 . 8 5
5 . . 2 4 . . 9 .
1 9 . . . . 5 . .
. 8 . . . . . 1 4
7 . . . 6 . . . .
. . 2 . . . . . .
. 5 6 4 7 . . 2 3 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 978524631325618749641397285563241897194783562287956314739162458412835976856479123 #1 Easy (318)
Naked Single: r9c8=2
Hidden Single: r4c6=1
Naked Single: r9c6=9
Naked Single: r9c1=8
Full House: r9c7=1
Hidden Single: r5c3=4
Hidden Single: r6c1=2
Hidden Single: r1c6=4
Naked Single: r1c1=9
Nak... |
normal_sudoku_1718 | .7....4....21...8.9...6...3.2...9.....9.51.2.8..23...95.......8.4....7....63...5. | 173892465652143987984765213425689371739451826861237549517924638348516792296378154 | Basic 9x9 Sudoku 1718 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . 7 . . . . 4 . .
. . 2 1 . . . 8 .
9 . . . 6 . . . 3
. 2 . . . 9 . . .
. . 9 . 5 1 . 2 .
8 . . 2 3 . . . 9
5 . . . . . . . 8
. 4 . . . . 7 . .
. . 6 3 . . . 5 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 173892465652143987984765213425689371739451826861237549517924638348516792296378154 #1 Extreme (31052) bf
Finned X-Wing: 2 r37 c67 fr7c5 => r89c6<>2
Forcing Net Verity => r3c4<>8
r9c6=4 (r3c6<>4) (r6c6<>4) (r7c4<>4) (r7c5<>4) r7c6<>4 r7c8=4 r6c8<>4 r6c3=4 r3c3<>4 r3c4=4 r3c4<>8
r9c6=7 (r3c6<>7) (r6c6<>7) (r7c4<... |
normal_sudoku_1798 | ....3.....2.56..4.8.....9..1......2.34....7..5.27...34.....6..3256379418.1.2...7. | 675934182921568347834127965197843526348652791562791834789416253256379418413285679 | Basic 9x9 Sudoku 1798 | puzzles5_forum_hardest_1905_11+ | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . . 3 . . . .
. 2 . 5 6 . . 4 .
8 . . . . . 9 . .
1 . . . . . . 2 .
3 4 . . . . 7 . .
5 . 2 7 . . . 3 4
. . . . . 6 . . 3
2 5 6 3 7 9 4 1 8
. 1 . 2 . . . 7 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 675934182921568347834127965197843526348652791562791834789416253256379418413285679 #1 Easy (244)
Full House: r8c1=2
Hidden Single: r2c7=3
Hidden Single: r1c1=6
Hidden Single: r4c6=3
Hidden Single: r1c4=9
Naked Single: r1c2=7
Naked Single: r2c1=9
Naked Single: r3c2=3
Naked Single: r2c3=1
Nak... |
normal_sudoku_889 | ...3...6..6..57..8.3..6.7....2....4.8475.9..3.1.84652..7..1.9..4......8...3..5..2 | 785394261264157398931268754652731849847529613319846527578412936426973185193685472 | Basic 9x9 Sudoku 889 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . 3 . . . 6 .
. 6 . . 5 7 . . 8
. 3 . . 6 . 7 . .
. . 2 . . . . 4 .
8 4 7 5 . 9 . . 3
. 1 . 8 4 6 5 2 .
. 7 . . 1 . 9 . .
4 . . . . . . 8 .
. . 3 . . 5 . . 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 785394261264157398931268754652731849847529613319846527578412936426973185193685472 #1 Medium (304)
Naked Single: r5c2=4
Naked Single: r5c8=1
Naked Single: r5c5=2
Full House: r5c7=6
Naked Single: r6c3=9
Naked Single: r9c8=7
Naked Single: r4c7=8
Naked Single: r4c2=5
Naked Single: r6c1=3
Full ... |
normal_sudoku_929 | 97..5......8..2.39321...6..8....7.93..........971.......9....6.7..64.9.8.8...9.27 | 974356812568712439321894675815467293643925781297183546159278364732641958486539127 | Basic 9x9 Sudoku 929 | 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 . . 5 . . . .
. . 8 . . 2 . 3 9
3 2 1 . . . 6 . .
8 . . . . 7 . 9 3
. . . . . . . . .
. 9 7 1 . . . . .
. . 9 . . . . 6 .
7 . . 6 4 . 9 . 8
. 8 . . . 9 . 2 7 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 974356812568712439321894675815467293643925781297183546159278364732641958486539127 #1 Hard (862)
Hidden Single: r7c3=9
Hidden Single: r8c3=2
Locked Candidates Type 1 (Pointing): 5 in b1 => r2c7<>5
Locked Candidates Type 1 (Pointing): 3 in b4 => r5c456<>3
Naked Triple: 1,3,5 in r8c6,r9c45 => r7c456<>3, r7c... |
normal_sudoku_2265 | ...9..2....6..35.94...2..1698...5..1.5..7...2........83..2..6....5..6..3.4...98.7 | 518967234276413589439528716982635471153874962764192358397281645825746193641359827 | Basic 9x9 Sudoku 2265 | 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 . . 3 5 . 9
4 . . . 2 . . 1 6
9 8 . . . 5 . . 1
. 5 . . 7 . . . 2
. . . . . . . . 8
3 . . 2 . . 6 . .
. . 5 . . 6 . . 3
. 4 . . . 9 8 . 7 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 518967234276413589439528716982635471153874962764192358397281645825746193641359827 #1 Unfair (1656)
Naked Single: r3c9=6
Naked Single: r1c9=4
Full House: r7c9=5
Naked Single: r9c8=2
Naked Single: r9c3=1
Naked Single: r9c1=6
Naked Single: r5c1=1
Hidden Single: r6c8=5
Hidden Single: r4c3=2
Na... |
normal_sudoku_4525 | .....93589......7..38.7.6...9...8.3.21...3.6.....1...4.6...7.8.1...8.2..8..5..... | 741269358926835471538471629694758132217943865385612794462197583159386247873524916 | Basic 9x9 Sudoku 4525 | 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 5 8
9 . . . . . . 7 .
. 3 8 . 7 . 6 . .
. 9 . . . 8 . 3 .
2 1 . . . 3 . 6 .
. . . . 1 . . . 4
. 6 . . . 7 . 8 .
1 . . . 8 . 2 . .
8 . . 5 . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 741269358926835471538471629694758132217943865385612794462197583159386247873524916 #1 Extreme (3366)
Turbot Fish: 1 r3c8 =1= r9c8 -1- r9c6 =1= r7c4 => r3c4<>1
X-Chain: 1 r1c3 =1= r1c4 -1- r7c4 =1= r9c6 -1- r9c8 =1= r3c8 => r3c3<>1
Discontinuous Nice Loop: 9 r9c9 -9- r8c8 -4- r8c6 -6- r8c9 =6= r9c9 => r9c9<>9
... |
normal_sudoku_6765 | 1....3.7..7.6.1...4.3.7.....47.6..1...8..7..5.1..3..4..3..9.46.........99.4...2.. | 192853674875641923463972581347569812628417395519238746231795468786324159954186237 | Basic 9x9 Sudoku 6765 | 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 . 7 .
. 7 . 6 . 1 . . .
4 . 3 . 7 . . . .
. 4 7 . 6 . . 1 .
. . 8 . . 7 . . 5
. 1 . . 3 . . 4 .
. 3 . . 9 . 4 6 .
. . . . . . . . 9
9 . 4 . . . 2 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 192853674875641923463972581347569812628417395519238746231795468786324159954186237 #1 Extreme (22202) bf
Grouped Discontinuous Nice Loop: 9 r1c7 -9- r2c78 =9= r2c3 -9- r6c3 =9= r5c2 -9- r5c8 =9= r456c7 -9- r1c7 => r1c7<>9
Grouped Discontinuous Nice Loop: 9 r3c7 -9- r2c78 =9= r2c3 -9- r6c3 =9= r5c2 -9- r5c8 =9= r45... |
normal_sudoku_2188 | 4...3859.9.....32..63.....48..45.17.7....1......7..6.9...245.3..51.....2......76. | 472138596918564327563927814829456173746391258135782649687245931351679482294813765 | Basic 9x9 Sudoku 2188 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 4 . . . 3 8 5 9 .
9 . . . . . 3 2 .
. 6 3 . . . . . 4
8 . . 4 5 . 1 7 .
7 . . . . 1 . . .
. . . 7 . . 6 . 9
. . . 2 4 5 . 3 .
. 5 1 . . . . . 2
. . . . . . 7 6 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 472138596918564327563927814829456173746391258135782649687245931351679482294813765 #1 Easy (208)
Naked Single: r4c8=7
Naked Single: r7c1=6
Naked Single: r3c7=8
Naked Single: r4c9=3
Naked Single: r8c1=3
Naked Single: r3c8=1
Naked Single: r7c7=9
Naked Single: r9c1=2
Naked Single: r8c7=4
Full ... |
normal_sudoku_1754 | ..971...84......75.......6............7.248533.5..679..36.71.8...86..........92.. | 659712348412368975873495162984537621167924853325186794536271489298643517741859236 | Basic 9x9 Sudoku 1754 | 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 7 1 . . . 8
4 . . . . . . 7 5
. . . . . . . 6 .
. . . . . . . . .
. . 7 . 2 4 8 5 3
3 . 5 . . 6 7 9 .
. 3 6 . 7 1 . 8 .
. . 8 6 . . . . .
. . . . . 9 2 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 659712348412368975873495162984537621167924853325186794536271489298643517741859236 #1 Easy (326)
Naked Single: r5c6=4
Naked Single: r6c5=8
Naked Single: r6c4=1
Naked Single: r5c4=9
Hidden Single: r4c6=7
Hidden Single: r2c5=6
Hidden Single: r9c9=6
Hidden Single: r4c7=6
Hidden Single: r9c4=8
... |
normal_sudoku_5732 | ...8....5.8....23..2..931..83..1..2..9.53..81........9.........1...4.9..56397..4. | 317862495489157236625493178836719524294536781751284369948325617172648953563971842 | Basic 9x9 Sudoku 5732 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . 8 . . . . 5
. 8 . . . . 2 3 .
. 2 . . 9 3 1 . .
8 3 . . 1 . . 2 .
. 9 . 5 3 . . 8 1
. . . . . . . . 9
. . . . . . . . .
1 . . . 4 . 9 . .
5 6 3 9 7 . . 4 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 317862495489157236625493178836719524294536781751284369948325617172648953563971842 #1 Extreme (3496)
Naked Single: r9c2=6
Naked Single: r8c2=7
Naked Single: r9c7=8
Naked Single: r7c2=4
Naked Single: r9c9=2
Full House: r9c6=1
Naked Single: r1c2=1
Full House: r6c2=5
Hidden Single: r3c9=8
Hidd... |
normal_sudoku_327 | .6..8.5.9.......6......6.875....2.....31.4....4..9...82..3......7..4..9...1..5... | 462781539758923461319456287597832614823164975146597328284319756675248193931675842 | Basic 9x9 Sudoku 327 | 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 . 5 . 9
. . . . . . . 6 .
. . . . . 6 . 8 7
5 . . . . 2 . . .
. . 3 1 . 4 . . .
. 4 . . 9 . . . 8
2 . . 3 . . . . .
. 7 . . 4 . . 9 .
. . 1 . . 5 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 462781539758923461319456287597832614823164975146597328284319756675248193931675842 #1 Extreme (41676) bf
Hidden Pair: 4,8 in r4c4,r5c6 => r4c4<>6, r4c4,r5c6<>7
Brute Force: r5c6=4
Naked Single: r4c4=8
Brute Force: r5c7=9
Forcing Chain Contradiction in c3 => r2c3<>9
r2c3=9 r2c3<>8
r2c3=9 r23c1<>9 r9c1=... |
normal_sudoku_2510 | ...7......2..9...8.....314...9..5.34...97.5..5..34..1.1....74....6.8..2..9.6..... | 914758263623491758857263149279815634431976582568342917182537496746189325395624871 | Basic 9x9 Sudoku 2510 | 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 . . 9 . . . 8
. . . . . 3 1 4 .
. . 9 . . 5 . 3 4
. . . 9 7 . 5 . .
5 . . 3 4 . . 1 .
1 . . . . 7 4 . .
. . 6 . 8 . . 2 .
. 9 . 6 . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 914758263623491758857263149279815634431976582568342917182537496746189325395624871 #1 Extreme (16782) bf
Brute Force: r5c4=9
Hidden Single: r8c6=9
Hidden Pair: 6,9 in r7c89 => r7c89<>5, r7c8<>8, r7c9<>3
Locked Candidates Type 1 (Pointing): 8 in b9 => r9c13<>8
Discontinuous Nice Loop: 2 r6c7 -2- r5c9 -6- r... |
normal_sudoku_2743 | .82.45......92837.9...16.....5..4.....8..9..6.73...9.........34.1..6..29......... | 382745691461928375957316482695874213148239756273651948826197534714563829539482167 | Basic 9x9 Sudoku 2743 | 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 . 4 5 . . .
. . . 9 2 8 3 7 .
9 . . . 1 6 . . .
. . 5 . . 4 . . .
. . 8 . . 9 . . 6
. 7 3 . . . 9 . .
. . . . . . . 3 4
. 1 . . 6 . . 2 9
. . . . . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 382745691461928375957316482695874213148239756273651948826197534714563829539482167 #1 Easy (314)
Naked Single: r2c5=2
Naked Single: r1c9=1
Naked Single: r1c7=6
Naked Single: r2c9=5
Naked Single: r1c8=9
Hidden Single: r4c2=9
Hidden Single: r4c9=3
Hidden Single: r2c3=1
Hidden Single: r9c8=6
H... |
normal_sudoku_3338 | ..3.92.76...8......7....58.3.9..4....6..254972.....3.1..62.97.57...6..23.....1... | 583492176691857234472613589359174862168325497247986351836249715714568923925731648 | Basic 9x9 Sudoku 3338 | 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 . 9 2 . 7 6
. . . 8 . . . . .
. 7 . . . . 5 8 .
3 . 9 . . 4 . . .
. 6 . . 2 5 4 9 7
2 . . . . . 3 . 1
. . 6 2 . 9 7 . 5
7 . . . 6 . . 2 3
. . . . . 1 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 583492176691857234472613589359174862168325497247986351836249715714568923925731648 #1 Easy (234)
Naked Single: r1c6=2
Naked Single: r8c6=8
Naked Single: r1c7=1
Naked Single: r8c7=9
Naked Single: r2c7=2
Hidden Single: r5c4=3
Hidden Single: r6c3=7
Naked Single: r6c5=8
Naked Single: r6c6=6
Nak... |
normal_sudoku_6894 | .46..32.1.8.2.......3.6.......31..........3.73.......5.348.6....2...1.8...142.6.3 | 746983251185247936293165748579312864412658397368794125934876512627531489851429673 | Basic 9x9 Sudoku 6894 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . 4 6 . . 3 2 . 1
. 8 . 2 . . . . .
. . 3 . 6 . . . .
. . . 3 1 . . . .
. . . . . . 3 . 7
3 . . . . . . . 5
. 3 4 8 . 6 . . .
. 2 . . . 1 . 8 .
. . 1 4 2 . 6 . 3 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 746983251185247936293165748579312864412658397368794125934876512627531489851429673 #1 Extreme (28444) bf
Hidden Single: r6c1=3
Hidden Single: r3c1=2
Hidden Single: r3c4=1
Hidden Single: r1c5=8
Hidden Single: r2c1=1
Hidden Single: r9c1=8
Hidden Single: r8c5=3
Hidden Single: r8c1=6
Hidden Single... |
normal_sudoku_199 | ....14..6.5.2...8.4....5..9.2.5...9...3.6...2......1....8.59.7.9657....837....9.. | 837914526659237481412685739126578394793461852584392167248159673965743218371826945 | Basic 9x9 Sudoku 199 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . . 1 4 . . 6
. 5 . 2 . . . 8 .
4 . . . . 5 . . 9
. 2 . 5 . . . 9 .
. . 3 . 6 . . . 2
. . . . . . 1 . .
. . 8 . 5 9 . 7 .
9 6 5 7 . . . . 8
3 7 . . . . 9 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 837914526659237481412685739126578394793461852584392167248159673965743218371826945 #1 Extreme (7726)
Hidden Single: r8c1=9
Finned Swordfish: 6 r347 c347 fr4c1 => r6c3<>6
Discontinuous Nice Loop: 4 r6c8 -4- r5c8 -5- r5c1 =5= r6c1 =6= r6c8 => r6c8<>4
Almost Locked Set XY-Wing: A=r6c234569 {2345789}, B=r13589c8... |
normal_sudoku_1632 | ..1....7....8.91...5.........2.8543.5.8.2.....1346.2..2.5.7...98....3..7....9...4 | 381546972726839145459712863672985431548321796913467258265174389894253617137698524 | Basic 9x9 Sudoku 1632 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . 1 . . . . 7 .
. . . 8 . 9 1 . .
. 5 . . . . . . .
. . 2 . 8 5 4 3 .
5 . 8 . 2 . . . .
. 1 3 4 6 . 2 . .
2 . 5 . 7 . . . 9
8 . . . . 3 . . 7
. . . . 9 . . . 4 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 381546972726839145459712863672985431548321796913467258265174389894253617137698524 #1 Easy (346)
Naked Single: r6c5=6
Naked Single: r6c6=7
Naked Single: r5c6=1
Naked Single: r6c1=9
Naked Single: r4c4=9
Full House: r5c4=3
Naked Single: r5c9=6
Naked Single: r4c9=1
Naked Single: r5c8=9
Naked S... |
normal_sudoku_2100 | 785...6.34...73....1.5...4....4..........98..159....3..923......7.....8...8..192. | 785214693426973518913586247837425169264139875159867432692348751571692384348751926 | Basic 9x9 Sudoku 2100 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 7 8 5 . . . 6 . 3
4 . . . 7 3 . . .
. 1 . 5 . . . 4 .
. . . 4 . . . . .
. . . . . 9 8 . .
1 5 9 . . . . 3 .
. 9 2 3 . . . . .
. 7 . . . . . 8 .
. . 8 . . 1 9 2 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 785214693426973518913586247837425169264139875159867432692348751571692384348751926 #1 Hard (1340)
Naked Single: r1c3=5
Naked Single: r2c3=6
Naked Single: r2c2=2
Naked Single: r3c3=3
Full House: r3c1=9
Naked Single: r4c3=7
Naked Single: r5c3=4
Full House: r8c3=1
Hidden Single: r4c1=8
Hidden ... |
normal_sudoku_1041 | .4.....8.7..5.8..2832.4.....7...2...68...5..3...3.6.7.......75...389.1...1....9.. | 145269387796538412832741695379482561681975243524316879968123754453897126217654938 | Basic 9x9 Sudoku 1041 | 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 .
7 . . 5 . 8 . . 2
8 3 2 . 4 . . . .
. 7 . . . 2 . . .
6 8 . . . 5 . . 3
. . . 3 . 6 . 7 .
. . . . . . 7 5 .
. . 3 8 9 . 1 . .
. 1 . . . . 9 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 145269387796538412832741695379482561681975243524316879968123754453897126217654938 #1 Medium (540)
Hidden Single: r3c1=8
Hidden Single: r4c1=3
Hidden Single: r9c3=7
Hidden Single: r9c5=5
Hidden Single: r8c6=7
Hidden Single: r9c8=3
Naked Single: r9c6=4
Naked Single: r9c1=2
Naked Single: r9c4=6
... |
normal_sudoku_1146 | 5432..7...9..3.4.281............6....257............74..4.6..5.3....21...6..45.97 | 543219768796538412812674935178456329425793681639821574984167253357982146261345897 | Basic 9x9 Sudoku 1146 | 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 3 2 . . 7 . .
. 9 . . 3 . 4 . 2
8 1 . . . . . . .
. . . . . 6 . . .
. 2 5 7 . . . . .
. . . . . . . 7 4
. . 4 . 6 . . 5 .
3 . . . . 2 1 . .
. 6 . . 4 5 . 9 7 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 543219768796538412812674935178456329425793681639821574984167253357982146261345897 #1 Easy (396)
Naked Single: r1c2=4
Hidden Single: r3c3=2
Hidden Single: r8c2=5
Hidden Single: r8c8=4
Hidden Single: r2c4=5
Hidden Single: r4c8=2
Hidden Single: r8c9=6
Hidden Single: r3c4=6
Naked Single: r3c8=3
... |
normal_sudoku_5224 | ..7..8..45...3.....2.....5.7..9..3....23.1..6.9.....1.2...1...7.7...64....4.8..6. | 937658124546132978128749653781965342452371896693824715269413587875296431314587269 | Basic 9x9 Sudoku 5224 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . 7 . . 8 . . 4
5 . . . 3 . . . .
. 2 . . . . . 5 .
7 . . 9 . . 3 . .
. . 2 3 . 1 . . 6
. 9 . . . . . 1 .
2 . . . 1 . . . 7
. 7 . . . 6 4 . .
. . 4 . 8 . . 6 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 937658124546132978128749653781965342452371896693824715269413587875296431314587269 #1 Extreme (27970) bf
Brute Force: r5c4=3
Hidden Single: r6c4=8
Locked Candidates Type 1 (Pointing): 6 in b5 => r13c5<>6
Finned Swordfish: 3 r368 c139 fr8c8 => r9c9<>3
Forcing Net Contradiction in c5 => r2c4<>4
r2c4=4 (r3... |
normal_sudoku_178 | 79.4.6.2.4..8.....8..3.5.19.8...1.561.6.5....5...381........7....8..9.6565.2..... | 793416528415892637862375419984721356136954872527638194249563781378149265651287943 | Basic 9x9 Sudoku 178 | 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 . 6 . 2 .
4 . . 8 . . . . .
8 . . 3 . 5 . 1 9
. 8 . . . 1 . 5 6
1 . 6 . 5 . . . .
5 . . . 3 8 1 . .
. . . . . . 7 . .
. . 8 . . 9 . 6 5
6 5 . 2 . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 793416528415892637862375419984721356136954872527638194249563781378149265651287943 #1 Easy (244)
Naked Single: r1c6=6
Naked Single: r3c3=2
Naked Single: r1c5=1
Naked Single: r3c2=6
Naked Single: r3c5=7
Full House: r3c7=4
Naked Single: r2c6=2
Full House: r2c5=9
Naked Single: r8c5=4
Naked Sin... |
normal_sudoku_385 | .....8.....96.4.8..6..3...45.6..7.1..7.3.9..69.....47..2...3..8..58.......7.2.1.. | 743298561159674382862135794536487219274319856918562473621753948395841627487926135 | Basic 9x9 Sudoku 385 | 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 . 4 . 8 .
. 6 . . 3 . . . 4
5 . 6 . . 7 . 1 .
. 7 . 3 . 9 . . 6
9 . . . . . 4 7 .
. 2 . . . 3 . . 8
. . 5 8 . . . . .
. . 7 . 2 . 1 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 743298561159674382862135794536487219274319856918562473621753948395841627487926135 #1 Extreme (22204) bf
Brute Force: r5c6=9
Forcing Chain Contradiction in r9c9 => r5c1<>8
r5c1=8 r5c7<>8 r4c7=8 r4c7<>3 r46c9=3 r9c9<>3
r5c1=8 r6c23<>8 r6c5=8 r6c5<>6 r6c6=6 r9c6<>6 r9c6=5 r9c9<>5
r5c1=8 r5c7<>8 r4c7=8 r4c7<>9 ... |
normal_sudoku_866 | .2..7....5......9.748..25...1.2...8...54.8..9.....1.....9....12...81..75...9..634 | 921576348536184297748392561413259786675438129892761453359647812264813975187925634 | Basic 9x9 Sudoku 866 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . 2 . . 7 . . . .
5 . . . . . . 9 .
7 4 8 . . 2 5 . .
. 1 . 2 . . . 8 .
. . 5 4 . 8 . . 9
. . . . . 1 . . .
. . 9 . . . . 1 2
. . . 8 1 . . 7 5
. . . 9 . . 6 3 4 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 921576348536184297748392561413259786675438129892761453359647812264813975187925634 #1 Easy (306)
Naked Single: r7c8=1
Naked Single: r8c7=9
Full House: r7c7=8
Naked Single: r3c8=6
Naked Single: r1c8=4
Naked Single: r5c8=2
Full House: r6c8=5
Hidden Single: r1c1=9
Hidden Single: r6c2=9
Hidden ... |
normal_sudoku_2618 | .36.4.....91.3.......5.7.9.3.......19..1.8.6..1....8.5.......3....47...6.23....79 | 536941782791832654482567193368754921945128367217396845674219538859473216123685479 | Basic 9x9 Sudoku 2618 | 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 . 4 . . . .
. 9 1 . 3 . . . .
. . . 5 . 7 . 9 .
3 . . . . . . . 1
9 . . 1 . 8 . 6 .
. 1 . . . . 8 . 5
. . . . . . . 3 .
. . . 4 7 . . . 6
. 2 3 . . . . 7 9 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 536941782791832654482567193368754921945128367217396845674219538859473216123685479 #1 Hard (924)
Hidden Single: r2c2=9
Hidden Single: r4c7=9
Hidden Single: r8c6=3
Hidden Single: r6c4=3
Hidden Single: r8c3=9
Hidden Single: r4c4=7
Locked Pair: 2,4 in r46c8 => r128c8,r5c79<>2, r2c8,r5c79<>4
Hidden S... |
normal_sudoku_6925 | .9.6....1..4..56......8..2.7...5...4.6.7.8.1...2..37..8......97.2.4..1....3...... | 397624851284195673156387429738251964569748312412963785841536297625479138973812546 | Basic 9x9 Sudoku 6925 | 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 . 6 . . . . 1
. . 4 . . 5 6 . .
. . . . 8 . . 2 .
7 . . . 5 . . . 4
. 6 . 7 . 8 . 1 .
. . 2 . . 3 7 . .
8 . . . . . . 9 7
. 2 . 4 . . 1 . .
. . 3 . . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 397624851284195673156387429738251964569748312412963785841536297625479138973812546 #1 Extreme (15640) bf
Brute Force: r5c6=8
Hidden Single: r9c4=8
Hidden Single: r7c4=5
Locked Candidates Type 1 (Pointing): 4 in b5 => r1c5<>4
Locked Candidates Type 1 (Pointing): 3 in b8 => r12c5<>3
X-Wing: 8 c37 r14 => ... |
normal_sudoku_2487 | 7....2......3....242.6...9...27.51....5..4.8....23.9............57.4...386.5.7... | 739452861586319742421678395692785134375194286148236957214963578957841623863527419 | Basic 9x9 Sudoku 2487 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 7 . . . . 2 . . .
. . . 3 . . . . 2
4 2 . 6 . . . 9 .
. . 2 7 . 5 1 . .
. . 5 . . 4 . 8 .
. . . 2 3 . 9 . .
. . . . . . . . .
. 5 7 . 4 . . . 3
8 6 . 5 . 7 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 739452861586319742421678395692785134375194286148236957214963578957841623863527419 #1 Medium (804)
Hidden Single: r3c2=2
Hidden Single: r5c7=2
Naked Single: r9c7=4
Hidden Single: r2c1=5
Hidden Single: r1c4=4
Hidden Single: r9c3=3
Hidden Single: r7c6=3
Hidden Single: r4c8=3
Hidden Single: r2c8=... |
normal_sudoku_1222 | .46.18.......73.14..12......29.5....3...9..4..8....7...6..8...5.....9..61...2..37 | 946518273852973614731264958629457381317896542485132769263781495578349126194625837 | Basic 9x9 Sudoku 1222 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . 4 6 . 1 8 . . .
. . . . 7 3 . 1 4
. . 1 2 . . . . .
. 2 9 . 5 . . . .
3 . . . 9 . . 4 .
. 8 . . . . 7 . .
. 6 . . 8 . . . 5
. . . . . 9 . . 6
1 . . . 2 . . 3 7 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 946518273852973614731264958629457381317896542485132769263781495578349126194625837 #1 Unfair (1480)
Naked Single: r1c5=1
Hidden Single: r3c2=3
Hidden Single: r5c2=1
Hidden Single: r8c2=7
Hidden Single: r5c3=7
Hidden Single: r5c7=5
Locked Candidates Type 1 (Pointing): 1 in b9 => r4c7<>1
Locked Can... |
normal_sudoku_1308 | 4.1....2..8.........2..48.31.4..8.7272.1..5...9.2........7..2.6..7.8..4...9..2... | 471835629386921457952674813164598372728163594593247168845719236217386945639452781 | Basic 9x9 Sudoku 1308 | 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 . 1 . . . . 2 .
. 8 . . . . . . .
. . 2 . . 4 8 . 3
1 . 4 . . 8 . 7 2
7 2 . 1 . . 5 . .
. 9 . 2 . . . . .
. . . 7 . . 2 . 6
. . 7 . 8 . . 4 .
. . 9 . . 2 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 471835629386921457952674813164598372728163594593247168845719236217386945639452781 #1 Extreme (26602) bf
Hidden Single: r5c2=2
Hidden Single: r1c4=8
Hidden Single: r9c4=4
Hidden Single: r2c5=2
Hidden Single: r8c1=2
Hidden Single: r7c2=4
Finned X-Wing: 1 r37 c58 fr7c6 => r9c5<>1
Brute Force: r5c8=... |
normal_sudoku_1295 | .4..5.6....39...7..2.........734..1.8.41...9....598.....9.3.1..47..89.3.3..4..9.. | 948753621513926478726814359697342815854167293132598764289635147471289536365471982 | Basic 9x9 Sudoku 1295 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . 4 . . 5 . 6 . .
. . 3 9 . . . 7 .
. 2 . . . . . . .
. . 7 3 4 . . 1 .
8 . 4 1 . . . 9 .
. . . 5 9 8 . . .
. . 9 . 3 . 1 . .
4 7 . . 8 9 . 3 .
3 . . 4 . . 9 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 948753621513926478726814359697342815854167293132598764289635147471289536365471982 #1 Medium (452)
Hidden Single: r6c5=9
Hidden Single: r8c3=1
Naked Single: r1c3=8
Naked Single: r1c8=2
Naked Single: r1c4=7
Hidden Single: r4c2=9
Hidden Single: r3c4=8
Hidden Single: r3c1=7
Hidden Single: r3c9=9
... |
normal_sudoku_2464 | .9..7.6.8..26..7.........4.2..59..7....78.31..7...65.9.2.9..1.735......2..1...... | 594271638132648795687359241216593874945782316873416529428935167359167482761824953 | Basic 9x9 Sudoku 2464 | 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 . 6 . 8
. . 2 6 . . 7 . .
. . . . . . . 4 .
2 . . 5 9 . . 7 .
. . . 7 8 . 3 1 .
. 7 . . . 6 5 . 9
. 2 . 9 . . 1 . 7
3 5 . . . . . . 2
. . 1 . . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 594271638132648795687359241216593874945782316873416529428935167359167482761824953 #1 Extreme (3672)
Hidden Single: r4c8=7
Hidden Single: r5c6=2
Hidden Single: r6c8=2
Hidden Single: r3c7=2
Hidden Single: r1c4=2
Hidden Single: r4c7=8
Hidden Single: r9c5=2
Hidden Single: r3c6=9
Hidden Single: r2... |
normal_sudoku_2022 | ...8....5..2.1.6..1....7.3..2.......9.7.2.4...64....23.1..9.3.....5....76....3.8. | 496832175732415698185967234321674859957328416864159723518796342243581967679243581 | Basic 9x9 Sudoku 2022 | 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
. . 2 . 1 . 6 . .
1 . . . . 7 . 3 .
. 2 . . . . . . .
9 . 7 . 2 . 4 . .
. 6 4 . . . . 2 3
. 1 . . 9 . 3 . .
. . . 5 . . . . 7
6 . . . . 3 . 8 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 496832175732415698185967234321674859957328416864159723518796342243581967679243581 #1 Extreme (19032) bf
Finned Swordfish: 1 r168 c678 fr6c4 => r45c6<>1
Brute Force: r5c3=7
Hidden Single: r4c3=1
2-String Kite: 3 in r1c5,r5c2 (connected by r4c5,r5c4) => r1c2<>3
X-Chain: 3 r5c2 =3= r5c4 -3- r2c4 =3= r1c5 -3... |
normal_sudoku_6295 | .1...4..8...3...6.....7.2..1....8..5.7561......8..37..59.4.......1..9..448..3..2. | 716254398259381467843976251124798635375612849968543712592467183631829574487135926 | Basic 9x9 Sudoku 6295 | 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 . . 8
. . . 3 . . . 6 .
. . . . 7 . 2 . .
1 . . . . 8 . . 5
. 7 5 6 1 . . . .
. . 8 . . 3 7 . .
5 9 . 4 . . . . .
. . 1 . . 9 . . 4
4 8 . . 3 . . 2 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 716254398259381467843976251124798635375612849968543712592467183631829574487135926 #1 Extreme (14306) bf
Brute Force: r5c2=7
Naked Single: r5c6=2
Hidden Single: r4c4=7
Hidden Single: r6c9=2
Hidden Single: r6c8=1
Hidden Single: r4c7=6
Locked Candidates Type 2 (Claiming): 4 in r5 => r4c8<>4
Naked P... |
normal_sudoku_4530 | .37.58..9..1...57.59.7...........83..13.8....7..9...51..814.........71...5..2.... | 237458619861392574594716328945271836613584297782963451378145962429637185156829743 | Basic 9x9 Sudoku 4530 | 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 . 5 8 . . 9
. . 1 . . . 5 7 .
5 9 . 7 . . . . .
. . . . . . 8 3 .
. 1 3 . 8 . . . .
7 . . 9 . . . 5 1
. . 8 1 4 . . . .
. . . . . 7 1 . .
. 5 . . 2 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 237458619861392574594716328945271836613584297782963451378145962429637185156829743 #1 Extreme (14002) bf
Hidden Single: r1c3=7
Hidden Single: r6c2=8
Hidden Single: r2c1=8
Hidden Single: r4c5=7
Hidden Single: r1c8=1
Hidden Single: r9c1=1
Hidden Single: r4c3=5
Hidden Single: r7c2=7
Hidden Single... |
normal_sudoku_1711 | 3.....76...1....9..6...4.15...73.......4982.672.65.....4.21...8..7...1.49......3. | 354189762871526493269374815496732581135498276728651349643217958587963124912845637 | Basic 9x9 Sudoku 1711 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 3 . . . . . 7 6 .
. . 1 . . . . 9 .
. 6 . . . 4 . 1 5
. . . 7 3 . . . .
. . . 4 9 8 2 . 6
7 2 . 6 5 . . . .
. 4 . 2 1 . . . 8
. . 7 . . . 1 . 4
9 . . . . . . 3 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 354189762871526493269374815496732581135498276728651349643217958587963124912845637 #1 Easy (212)
Naked Single: r5c5=9
Naked Single: r1c9=2
Naked Single: r6c6=1
Full House: r4c6=2
Naked Single: r1c5=8
Naked Single: r2c9=3
Naked Single: r9c9=7
Naked Single: r8c5=6
Naked Single: r2c4=5
Naked S... |
normal_sudoku_1968 | .3...1..2..29..14.1...2.8....8.1...4.1.7...2.4....631..51...46.7....5.....3.9...1 | 834571692572968143169423875628319754315784926497256318951832467786145239243697581 | Basic 9x9 Sudoku 1968 | 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 . . 2
. . 2 9 . . 1 4 .
1 . . . 2 . 8 . .
. . 8 . 1 . . . 4
. 1 . 7 . . . 2 .
4 . . . . 6 3 1 .
. 5 1 . . . 4 6 .
7 . . . . 5 . . .
. . 3 . 9 . . . 1 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 834571692572968143169423875628319754315784926497256318951832467786145239243697581 #1 Extreme (4168)
Hidden Single: r5c2=1
Hidden Single: r8c4=1
Locked Candidates Type 1 (Pointing): 8 in b6 => r78c9<>8
Sashimi X-Wing: 9 r67 c19 fr6c2 fr6c3 => r45c1<>9
Almost Locked Set XZ-Rule: A=r7c456 {2378}, B=r78c9,r8... |
normal_sudoku_3738 | ..815...4.4.....5......489.7..6......1.3.5..7.869.7..58......2..9...1..8..7.3.... | 628159374149783256573264891735618942914325687286947135851496723392571468467832519 | Basic 9x9 Sudoku 3738 | 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 5 . . . 4
. 4 . . . . . 5 .
. . . . . 4 8 9 .
7 . . 6 . . . . .
. 1 . 3 . 5 . . 7
. 8 6 9 . 7 . . 5
8 . . . . . . 2 .
. 9 . . . 1 . . 8
. . 7 . 3 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 628159374149783256573264891735618942914325687286947135851496723392571468467832519 #1 Extreme (14822) bf
Brute Force: r5c4=3
Locked Candidates Type 1 (Pointing): 4 in b5 => r78c5<>4
Forcing Chain Contradiction in r2c4 => r1c6<>2
r1c6=2 r2c4<>2
r1c6=2 r3c4<>2 r3c4=7 r2c4<>7
r1c6=2 r4c6<>2 r4c6=8 r9c6<>8 r9... |
normal_sudoku_5716 | .5.81...4..4....2..3......9...4...92.26..3.5..9.25.6..24.....35........6.63..5.4. | 957812364684739521132564879315486792726193458498257613241678935579341286863925147 | Basic 9x9 Sudoku 5716 | 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 1 . . . 4
. . 4 . . . . 2 .
. 3 . . . . . . 9
. . . 4 . . . 9 2
. 2 6 . . 3 . 5 .
. 9 . 2 5 . 6 . .
2 4 . . . . . 3 5
. . . . . . . . 6
. 6 3 . . 5 . 4 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 957812364684739521132564879315486792726193458498257613241678935579341286863925147 #1 Extreme (13692) bf
Hidden Single: r5c2=2
Hidden Single: r1c7=3
Hidden Single: r6c1=4
Hidden Single: r5c7=4
Hidden Single: r6c9=3
Hidden Single: r4c1=3
Hidden Single: r4c3=5
Hidden Single: r8c1=5
Brute Force: ... |
normal_sudoku_6130 | .....8..6..62..7......1..429...341...8...53....49....7..14...7..5......13...9.6.. | 492378516516249783873516942925734168187625394634981257261453879759862431348197625 | Basic 9x9 Sudoku 6130 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . . . 8 . . 6
. . 6 2 . . 7 . .
. . . . 1 . . 4 2
9 . . . 3 4 1 . .
. 8 . . . 5 3 . .
. . 4 9 . . . . 7
. . 1 4 . . . 7 .
. 5 . . . . . . 1
3 . . . 9 . 6 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 492378516516249783873516942925734168187625394634981257261453879759862431348197625 #1 Extreme (13420) bf
Forcing Chain Contradiction in r1c5 => r9c4<>7
r9c4=7 r9c4<>5 r7c5=5 r2c5<>5 r2c5=4 r1c5<>4
r9c4=7 r9c4<>5 r7c5=5 r1c5<>5
r9c4=7 r45c4<>7 r5c5=7 r1c5<>7
Forcing Net Contradiction in c1 => r2c1<>4
r2c1=4... |
normal_sudoku_309 | ..6..8.49.9..37..83....9....1.....7...4.......5..1.98..85.4.....698.3..7.....1.6. | 276158349591437628348269751913682475824975136657314982185746293469823517732591864 | Basic 9x9 Sudoku 309 | 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 . 4 9
. 9 . . 3 7 . . 8
3 . . . . 9 . . .
. 1 . . . . . 7 .
. . 4 . . . . . .
. 5 . . 1 . 9 8 .
. 8 5 . 4 . . . .
. 6 9 8 . 3 . . 7
. . . . . 1 . 6 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 276158349591437628348269751913682475824975136657314982185746293469823517732591864 #1 Hard (1340)
Hidden Single: r1c9=9
Hidden Single: r3c3=8
Hidden Single: r9c7=8
Hidden Single: r7c8=9
Hidden Single: r1c7=3
Hidden Single: r2c3=1
Hidden Single: r5c8=3
Hidden Single: r7c9=3
Hidden Single: r3c7=... |
normal_sudoku_2605 | .17..5..8.3....75....97..6.428..7.1..6.4.....37.1......82..15.........81....6...2 | 917635248236814759854972163428597316169423875375186924682341597743259681591768432 | Basic 9x9 Sudoku 2605 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . 1 7 . . 5 . . 8
. 3 . . . . 7 5 .
. . . 9 7 . . 6 .
4 2 8 . . 7 . 1 .
. 6 . 4 . . . . .
3 7 . 1 . . . . .
. 8 2 . . 1 5 . .
. . . . . . . 8 1
. . . . 6 . . . 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 917635248236814759854972163428597316169423875375186924682341597743259681591768432 #1 Hard (1116)
Hidden Single: r3c5=7
Hidden Single: r2c5=1
Hidden Single: r3c7=1
Locked Pair: 4,5 in r3c23 => r3c1<>5, r2c3,r3c69<>4
Naked Single: r3c9=3
Locked Candidates Type 1 (Pointing): 2 in b3 => r1c145<>2
Locke... |
normal_sudoku_6674 | ..8.314.714..758....3.8...5..7.5.....8.7.26..69...8.....6..37...7..6..8....5....6 | 958231467142675839763984125237456918481792653695318274526843791374169582819527346 | Basic 9x9 Sudoku 6674 | 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 . 7
1 4 . . 7 5 8 . .
. . 3 . 8 . . . 5
. . 7 . 5 . . . .
. 8 . 7 . 2 6 . .
6 9 . . . 8 . . .
. . 6 . . 3 7 . .
. 7 . . 6 . . 8 .
. . . 5 . . . . 6 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 958231467142675839763984125237456918481792653695318274526843791374169582819527346 #1 Extreme (10646)
Hidden Single: r2c5=7
Hidden Single: r6c8=7
Hidden Single: r3c1=7
Hidden Single: r4c9=8
Hidden Single: r9c1=8
Hidden Single: r7c4=8
Hidden Single: r9c6=7
Locked Candidates Type 1 (Pointing): 2 in... |
normal_sudoku_2103 | ..2.1....59...3..48176..9..62.8....1..1.2.3...5.1.7.9.......8.5.3....47...5..4.39 | 342918567596273184817645923623859741971426358458137692764392815239581476185764239 | Basic 9x9 Sudoku 2103 | 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 . . . .
5 9 . . . 3 . . 4
8 1 7 6 . . 9 . .
6 2 . 8 . . . . 1
. . 1 . 2 . 3 . .
. 5 . 1 . 7 . 9 .
. . . . . . 8 . 5
. 3 . . . . 4 7 .
. . 5 . . 4 . 3 9 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 342918567596273184817645923623859741971426358458137692764392815239581476185764239 #1 Easy (284)
Naked Single: r2c1=5
Naked Single: r2c3=6
Naked Single: r1c2=4
Full House: r1c1=3
Naked Single: r6c1=4
Hidden Single: r4c7=7
Hidden Single: r3c5=4
Hidden Single: r3c9=3
Hidden Single: r7c4=3
Hid... |
normal_sudoku_5912 | 13.4.6...9...513.....93..6..43.....75......38..........69....4..1..4.9.5..5..3... | 132476859986251374754938162643189527591724638278365491869517243317642985425893716 | Basic 9x9 Sudoku 5912 | 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 . 4 . 6 . . .
9 . . . 5 1 3 . .
. . . 9 3 . . 6 .
. 4 3 . . . . . 7
5 . . . . . . 3 8
. . . . . . . . .
. 6 9 . . . . 4 .
. 1 . . 4 . 9 . 5
. . 5 . . 3 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 132476859986251374754938162643189527591724638278365491869517243317642985425893716 #1 Extreme (37498) bf
Hidden Single: r1c2=3
Hidden Single: r2c3=6
Hidden Single: r8c4=6
Hidden Single: r9c1=4
Hidden Single: r6c4=3
Hidden Single: r8c1=3
Hidden Single: r7c9=3
Hidden Single: r9c5=9
Hidden Single... |
normal_sudoku_5198 | 2.84.1.....5..2...9..6..2...8.....67.29...5.8..7...9...5....6.2...2.8.7.7..5...9. | 268471359315982746974653281583129467629347518147865923851794632496238175732516894 | Basic 9x9 Sudoku 5198 | 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 . 8 4 . 1 . . .
. . 5 . . 2 . . .
9 . . 6 . . 2 . .
. 8 . . . . . 6 7
. 2 9 . . . 5 . 8
. . 7 . . . 9 . .
. 5 . . . . 6 . 2
. . . 2 . 8 . 7 .
7 . . 5 . . . 9 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 268471359315982746974653281583129467629347518147865923851794632496238175732516894 #1 Extreme (23368) bf
Hidden Single: r1c1=2
Hidden Single: r6c8=2
Hidden Single: r4c5=2
Hidden Single: r9c3=2
Hidden Single: r7c1=8
Hidden Single: r8c9=5
Hidden Single: r8c2=9
Hidden Single: r9c7=8
Hidden Single... |
normal_sudoku_3717 | 7..5....2.38....7..6.7..3....1.4.........2.156..85..2.8..6.5.3..97.8....3.621..8. | 714539862238164579965728341521346798483972615679851423842695137197483256356217984 | Basic 9x9 Sudoku 3717 | 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 . . 5 . . . . 2
. 3 8 . . . . 7 .
. 6 . 7 . . 3 . .
. . 1 . 4 . . . .
. . . . . 2 . 1 5
6 . . 8 5 . . 2 .
8 . . 6 . 5 . 3 .
. 9 7 . 8 . . . .
3 . 6 2 1 . . 8 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 714539862238164579965728341521346798483972615679851423842695137197483256356217984 #1 Easy (378)
Hidden Single: r6c5=5
Hidden Single: r6c6=1
Hidden Single: r2c4=1
Hidden Single: r3c3=5
Hidden Single: r8c4=4
Naked Single: r8c6=3
Hidden Single: r2c7=5
Hidden Single: r8c8=5
Hidden Single: r7c3=2
... |
normal_sudoku_6675 | 1...549.7.74.98...9.5....488....14.5.1.....9....436.7..4....18..91..5...7.8...... | 182654937374298516965173248837921465416587392259436871543762189691845723728319654 | Basic 9x9 Sudoku 6675 | 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 . . . 5 4 9 . 7
. 7 4 . 9 8 . . .
9 . 5 . . . . 4 8
8 . . . . 1 4 . 5
. 1 . . . . . 9 .
. . . 4 3 6 . 7 .
. 4 . . . . 1 8 .
. 9 1 . . 5 . . .
7 . 8 . . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 182654937374298516965173248837921465416587392259436871543762189691845723728319654 #1 Extreme (4794)
Hidden Single: r1c6=4
Hidden Single: r5c1=4
Hidden Single: r4c4=9
Hidden Single: r6c7=8
Hidden Single: r6c9=1
Hidden Single: r2c8=1
Hidden Single: r6c3=9
Hidden Single: r5c4=5
Hidden Single: r7... |
normal_sudoku_2952 | .5.........97..1..6....2..3...9.....5.74...181...783....5...6.2....4.8.18....6.3. | 758139426239764185641582793483951267567423918192678354315897642926345871874216539 | Basic 9x9 Sudoku 2952 | 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 . . . . . . .
. . 9 7 . . 1 . .
6 . . . . 2 . . 3
. . . 9 . . . . .
5 . 7 4 . . . 1 8
1 . . . 7 8 3 . .
. . 5 . . . 6 . 2
. . . . 4 . 8 . 1
8 . . . . 6 . 3 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 758139426239764185641582793483951267567423918192678354315897642926345871874216539 #1 Extreme (23642) bf
Brute Force: r5c1=5
Naked Single: r5c6=3
Locked Candidates Type 1 (Pointing): 9 in b4 => r789c2<>9
Brute Force: r4c9=7
Turbot Fish: 7 r1c1 =7= r3c2 -7- r9c2 =7= r9c7 => r1c7<>7
Empty Rectangle: 6 in... |
normal_sudoku_6523 | ..1.9..35.....38..3.....9.4.1....3..8.......95.327...14...........35..48.85..91.. | 641897235972543816358612974214968357867135429593274681436781592129356748785429163 | Basic 9x9 Sudoku 6523 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . 1 . 9 . . 3 5
. . . . . 3 8 . .
3 . . . . . 9 . 4
. 1 . . . . 3 . .
8 . . . . . . . 9
5 . 3 2 7 . . . 1
4 . . . . . . . .
. . . 3 5 . . 4 8
. 8 5 . . 9 1 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 641897235972543816358612974214968357867135429593274681436781592129356748785429163 #1 Extreme (13776) bf
Hidden Single: r1c8=3
Hidden Single: r5c5=3
Hidden Single: r3c3=8
Hidden Single: r7c2=3
Hidden Single: r6c2=9
Hidden Single: r4c4=9
Hidden Single: r7c8=9
Hidden Single: r8c1=1
Hidden Single... |
normal_sudoku_1239 | .5.6..4..87...4..6..437.1.......6.....51.32......2..9.53.4...12..2......14....5.. | 359618427871254936264379185728946351695183274413725698536497812982561743147832569 | Basic 9x9 Sudoku 1239 | puzzles5_forum_hardest_1905_11+ | Each row, column, and 3×3 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 . . 4 . .
8 7 . . . 4 . . 6
. . 4 3 7 . 1 . .
. . . . . 6 . . .
. . 5 1 . 3 2 . .
. . . . 2 . . 9 .
5 3 . 4 . . . 1 2
. . 2 . . . . . .
1 4 . . . . 5 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 359618427871254936264379185728946351695183274413725698536497812982561743147832569 #1 Extreme (22982) bf
Locked Candidates Type 1 (Pointing): 1 in b1 => r46c3<>1
Brute Force: r5c6=3
Forcing Net Contradiction in b6 => r4c9<>7
r4c9=7 r4c9<>1 r4c2=1 (r4c2<>2 r4c1=2 r1c1<>2 r1c6=2 r2c4<>2 r2c8=2 r2c8<>3) (r4c2<>2... |
normal_sudoku_1131 | ..2.9.5.......3.4....8....61.......5.4735..8..59...7..9....1....8..7.2....56....3 | 362194578871563942594827316138749625247356189659218734926431857483975261715682493 | Basic 9x9 Sudoku 1131 | 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 . 5 . .
. . . . . 3 . 4 .
. . . 8 . . . . 6
1 . . . . . . . 5
. 4 7 3 5 . . 8 .
. 5 9 . . . 7 . .
9 . . . . 1 . . .
. 8 . . 7 . 2 . .
. . 5 6 . . . . 3 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 362194578871563942594827316138749625247356189659218734926431857483975261715682493 #1 Extreme (21826) bf
Brute Force: r5c4=3
Hidden Single: r7c5=3
Locked Candidates Type 1 (Pointing): 1 in b5 => r6c89<>1
Locked Candidates Type 1 (Pointing): 8 in b8 => r9c7<>8
2-String Kite: 3 in r3c7,r6c1 (connected by r4... |
normal_sudoku_2919 | ..61...7.2...6.4...8....9.6...3..6.7..3..6..4.6..1..3.6...8...5..47.1.....8.5..4. | 946135872217968453385274916159342687873596124462817539621483795594721368738659241 | Basic 9x9 Sudoku 2919 | 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 . . . 7 .
2 . . . 6 . 4 . .
. 8 . . . . 9 . 6
. . . 3 . . 6 . 7
. . 3 . . 6 . . 4
. 6 . . 1 . . 3 .
6 . . . 8 . . . 5
. . 4 7 . 1 . . .
. . 8 . 5 . . 4 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 946135872217968453385274916159342687873596124462817539621483795594721368738659241 #1 Extreme (17922) bf
Hidden Single: r1c3=6
Hidden Single: r8c8=6
Hidden Single: r9c4=6
Finned X-Wing: 4 c25 r14 fr3c5 => r1c6<>4
Brute Force: r5c4=5
Sashimi X-Wing: 8 c48 r26 fr4c8 fr5c8 => r6c79<>8
Forcing Chain Con... |
normal_sudoku_2167 | 5.2...13..1..25..9.8..3.5.2..1.8..9.8.......52...64...3.5...9.819...83.....3....1 | 562849137413725869987631542731582694846973215259164783375416928194258376628397451 | Basic 9x9 Sudoku 2167 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 5 . 2 . . . 1 3 .
. 1 . . 2 5 . . 9
. 8 . . 3 . 5 . 2
. . 1 . 8 . . 9 .
8 . . . . . . . 5
2 . . . 6 4 . . .
3 . 5 . . . 9 . 8
1 9 . . . 8 3 . .
. . . 3 . . . . 1 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 562849137413725869987631542731582694846973215259164783375416928194258376628397451 #1 Extreme (21600) bf
Hidden Single: r2c2=1
Hidden Single: r3c1=9
Hidden Single: r1c4=8
Hidden Single: r9c3=8
Hidden Single: r2c3=3
Locked Candidates Type 1 (Pointing): 5 in b5 => r8c4<>5
Locked Candidates Type 2 (Cla... |
normal_sudoku_160 | 52.....698...3.1.2..1.......345.1.98.....8...6..3....1.7.913..61..8.6.......279.. | 523184769869735142741692583234571698917268354658349271475913826192856437386427915 | Basic 9x9 Sudoku 160 | 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 . . . . . 6 9
8 . . . 3 . 1 . 2
. . 1 . . . . . .
. 3 4 5 . 1 . 9 8
. . . . . 8 . . .
6 . . 3 . . . . 1
. 7 . 9 1 3 . . 6
1 . . 8 . 6 . . .
. . . . 2 7 9 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 523184769869735142741692583234571698917268354658349271475913826192856437386427915 #1 Extreme (3788)
Naked Single: r4c2=3
Naked Single: r1c6=4
Naked Single: r9c4=4
Full House: r8c5=5
Naked Single: r9c1=3
Naked Single: r9c9=5
Hidden Single: r1c4=1
Hidden Single: r5c2=1
Hidden Single: r9c8=1
... |
normal_sudoku_1933 | .7...13.....3.214.23.5..9.8.........7.385.....2...6.87.18.......9..1..23........4 | 674981352859372146231564978186247539743859261925136487418623795597418623362795814 | Basic 9x9 Sudoku 1933 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . 7 . . . 1 3 . .
. . . 3 . 2 1 4 .
2 3 . 5 . . 9 . 8
. . . . . . . . .
7 . 3 8 5 . . . .
. 2 . . . 6 . 8 7
. 1 8 . . . . . .
. 9 . . 1 . . 2 3
. . . . . . . . 4 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 674981352859372146231564978186247539743859261925136487418623795597418623362795814 #1 Easy (320)
Hidden Single: r3c2=3
Hidden Single: r2c5=7
Naked Single: r3c6=4
Naked Single: r3c5=6
Naked Single: r5c6=9
Naked Single: r1c4=9
Full House: r1c5=8
Naked Single: r3c3=1
Full House: r3c8=7
Hidden ... |
normal_sudoku_4539 | ..87...9..9.5..2..2....4..3..58......2..61...18...93......7.4.14....8.3..6......2 | 318726594794513268256984713645837129923461857187259346539672481472198635861345972 | Basic 9x9 Sudoku 4539 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . 8 7 . . . 9 .
. 9 . 5 . . 2 . .
2 . . . . 4 . . 3
. . 5 8 . . . . .
. 2 . . 6 1 . . .
1 8 . . . 9 3 . .
. . . . 7 . 4 . 1
4 . . . . 8 . 3 .
. 6 . . . . . . 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 318726594794513268256984713645837129923461857187259346539672481472198635861345972 #1 Extreme (17102) bf
Brute Force: r5c6=1
Hidden Single: r6c5=5
Hidden Single: r4c6=7
Grouped Discontinuous Nice Loop: 5 r1c9 -5- r1c1 =5= r79c1 -5- r7c2 -3- r4c2 -4- r1c2 =4= r1c9 => r1c9<>5
Forcing Chain Contradiction in ... |
normal_sudoku_5678 | .7.6...8......4....6.81.72..27...6.8...3.....9...2.17.7.2.6.91.19...5...6.3...... | 379652481218734596465819723527941638841376259936528174782463915194285367653197842 | Basic 9x9 Sudoku 5678 | 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 . 6 . . . 8 .
. . . . . 4 . . .
. 6 . 8 1 . 7 2 .
. 2 7 . . . 6 . 8
. . . 3 . . . . .
9 . . . 2 . 1 7 .
7 . 2 . 6 . 9 1 .
1 9 . . . 5 . . .
6 . 3 . . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 379652481218734596465819723527941638841376259936528174782463915194285367653197842 #1 Extreme (1966)
Hidden Single: r7c1=7
Naked Single: r7c4=4
Naked Single: r6c4=5
Locked Pair: 1,9 in r4c46 => r4c58,r5c56<>9, r5c6<>1
Naked Single: r4c5=4
Locked Candidates Type 1 (Pointing): 5 in b7 => r25c2<>5
2-St... |
normal_sudoku_6017 | .1..6.2...8.4.2176.......3..526..4....4.15..98...24....2..463..3.........4...15.2 | 413967285589432176276158934752693418634815729891724653128546397365279841947381562 | Basic 9x9 Sudoku 6017 | 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 . . 6 . 2 . .
. 8 . 4 . 2 1 7 6
. . . . . . . 3 .
. 5 2 6 . . 4 . .
. . 4 . 1 5 . . 9
8 . . . 2 4 . . .
. 2 . . 4 6 3 . .
3 . . . . . . . .
. 4 . . . 1 5 . 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 413967285589432176276158934752693418634815729891724653128546397365279841947381562 #1 Hard (1248)
Hidden Single: r2c7=1
Hidden Single: r5c8=2
Hidden Single: r3c1=2
Hidden Single: r3c4=1
Hidden Single: r8c4=2
Hidden Single: r3c9=4
Hidden Single: r1c1=4
Hidden Single: r8c8=4
Locked Candidates Ty... |
normal_sudoku_23 | ....79.31...2.39...3.41....1.79..2......21..742.....9.......4..84.1...7.6....4..2 | 264579831718263954539418726187945263396821547425637198972386415843152679651794382 | Basic 9x9 Sudoku 23 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . . 7 9 . 3 1
. . . 2 . 3 9 . .
. 3 . 4 1 . . . .
1 . 7 9 . . 2 . .
. . . . 2 1 . . 7
4 2 . . . . . 9 .
. . . . . . 4 . .
8 4 . 1 . . . 7 .
6 . . . . 4 . . 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 264579831718263954539418726187945263396821547425637198972386415843152679651794382 #1 Extreme (21578) bf
Hidden Single: r5c5=2
Hidden Single: r6c7=1
Hidden Single: r1c3=4
Hidden Single: r3c7=7
Hidden Single: r3c8=2
Hidden Single: r5c8=4
Hidden Single: r4c5=4
Hidden Single: r1c1=2
Hidden Single... |
normal_sudoku_3065 | 9..54.......18.7.6..13.....4...91....18......29...8.3.1....4....3..2..1.82..1.9.4 | 972546183345182796681379542463291875518437269297658431159864327734925618826713954 | Basic 9x9 Sudoku 3065 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 9 . . 5 4 . . . .
. . . 1 8 . 7 . 6
. . 1 3 . . . . .
4 . . . 9 1 . . .
. 1 8 . . . . . .
2 9 . . . 8 . 3 .
1 . . . . 4 . . .
. 3 . . 2 . . 1 .
8 2 . . 1 . 9 . 4 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 972546183345182796681379542463291875518437269297658431159864327734925618826713954 #1 Extreme (11566)
Hidden Single: r4c6=1
Hidden Single: r8c3=4
Hidden Single: r9c6=3
Hidden Single: r4c3=3
Hidden Single: r7c3=9
Hidden Single: r5c5=3
Hidden Single: r2c1=3
Hidden Single: r8c4=9
Hidden Single: r... |
normal_sudoku_3226 | ...63....37..5468..6......55.73..84.....78.5668....3..43..2..............5..1...3 | 815639274372154689964782135527396841143278956689541327431925768798463512256817493 | Basic 9x9 Sudoku 3226 | 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 3 . . . .
3 7 . . 5 4 6 8 .
. 6 . . . . . . 5
5 . 7 3 . . 8 4 .
. . . . 7 8 . 5 6
6 8 . . . . 3 . .
4 3 . . 2 . . . .
. . . . . . . . .
. 5 . . 1 . . . 3 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 815639274372154689964782135527396841143278956689541327431925768798463512256817493 #1 Extreme (13462) bf
Hidden Single: r2c7=6
Hidden Single: r3c8=3
Hidden Single: r5c3=3
Hidden Single: r1c3=5
Hidden Single: r8c6=3
Hidden Single: r1c1=8
Finned Swordfish: 4 r159 c247 fr1c9 => r3c7<>4
Hidden Single... |
normal_sudoku_4982 | .5.4269...9.5..4....8..7...9.6...5...3..5.6.4...6....3.....1.29.6.2..3..2......4. | 357426981692518437418937265946183572831752694725649813584361729169274358273895146 | Basic 9x9 Sudoku 4982 | 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 . 4 2 6 9 . .
. 9 . 5 . . 4 . .
. . 8 . . 7 . . .
9 . 6 . . . 5 . .
. 3 . . 5 . 6 . 4
. . . 6 . . . . 3
. . . . . 1 . 2 9
. 6 . 2 . . 3 . .
2 . . . . . . 4 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 357426981692518437418937265946183572831752694725649813584361729169274358273895146 #1 Extreme (11706) bf
Locked Candidates Type 1 (Pointing): 8 in b2 => r2c89<>8
Locked Candidates Type 2 (Claiming): 5 in r7 => r8c13,r9c3<>5
Almost Locked Set XZ-Rule: A=r125c3 {1237}, B=r79c2,r8c13,r9c3 {134789}, X=3, Z=7 => r7c... |
normal_sudoku_2647 | .42.5...93...6..5..76...1..289.74....1.2..4..4...36...........7....436818....5.4. | 142357869398461752576892134289574316613289475457136298934618527725943681861725943 | Basic 9x9 Sudoku 2647 | 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 . 5 . . . 9
3 . . . 6 . . 5 .
. 7 6 . . . 1 . .
2 8 9 . 7 4 . . .
. 1 . 2 . . 4 . .
4 . . . 3 6 . . .
. . . . . . . . 7
. . . . 4 3 6 8 1
8 . . . . 5 . 4 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 142357869398461752576892134289574316613289475457136298934618527725943681861725943 #1 Easy (238)
Naked Single: r1c2=4
Naked Single: r6c2=5
Naked Single: r1c1=1
Naked Single: r2c2=9
Naked Single: r6c3=7
Naked Single: r2c3=8
Full House: r3c1=5
Naked Single: r8c2=2
Naked Single: r5c1=6
Full Ho... |
normal_sudoku_2767 | ..7..62....2..8..3.9....16.5718..6.96....1.4..495...3..3.1..4.7.8..3..1.7........ | 457316298162498573398257164571843629623971845849562731936125487285734916714689352 | Basic 9x9 Sudoku 2767 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . 7 . . 6 2 . .
. . 2 . . 8 . . 3
. 9 . . . . 1 6 .
5 7 1 8 . . 6 . 9
6 . . . . 1 . 4 .
. 4 9 5 . . . 3 .
. 3 . 1 . . 4 . 7
. 8 . . 3 . . 1 .
7 . . . . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 457316298162498573398257164571843629623971845849562731936125487285734916714689352 #1 Easy (278)
Naked Single: r4c7=6
Naked Single: r4c8=2
Naked Single: r5c2=2
Naked Single: r4c5=4
Full House: r4c6=3
Naked Single: r6c1=8
Full House: r5c3=3
Naked Single: r6c7=7
Naked Single: r6c9=1
Naked Sin... |
normal_sudoku_3740 | 9..725....4.........5.34.2..59.8.342.......5...3...6.8.7.4..1....8.6..3......1..9 | 931725864247618593685934721759186342816342957423579618572493186198267435364851279 | Basic 9x9 Sudoku 3740 | 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 5 . . .
. 4 . . . . . . .
. . 5 . 3 4 . 2 .
. 5 9 . 8 . 3 4 2
. . . . . . . 5 .
. . 3 . . . 6 . 8
. 7 . 4 . . 1 . .
. . 8 . 6 . . 3 .
. . . . . 1 . . 9 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 931725864247618593685934721759186342816342957423579618572493186198267435364851279 #1 Hard (870)
Hidden Single: r3c6=4
Hidden Single: r8c2=9
Hidden Single: r8c1=1
Hidden Single: r4c4=1
Hidden Single: r2c5=1
Locked Candidates Type 1 (Pointing): 4 in b7 => r9c7<>4
Naked Triple: 2,5,7 in r8c46,r9c5 => ... |
normal_sudoku_1227 | .....7.........1.9.43.58..7....6.9....8.9..32...21......4.2..9.9....62.1....7..56 | 296147385587632149143958627372865914618794532459213768764521893935486271821379456 | Basic 9x9 Sudoku 1227 | puzzles2_17_clue | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . . . 7 . . .
. . . . . . 1 . 9
. 4 3 . 5 8 . . 7
. . . . 6 . 9 . .
. . 8 . 9 . . 3 2
. . . 2 1 . . . .
. . 4 . 2 . . 9 .
9 . . . . 6 2 . 1
. . . . 7 . . 5 6 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 296147385587632149143958627372865914618794532459213768764521893935486271821379456 #1 Easy (364)
Naked Single: r3c5=5
Naked Single: r3c7=6
Naked Single: r3c8=2
Naked Single: r3c1=1
Full House: r3c4=9
Hidden Single: r4c4=8
Hidden Single: r2c6=2
Hidden Single: r9c6=9
Hidden Single: r4c8=1
Hid... |
normal_sudoku_6427 | ..5..874..67..31..2.1...9......36.......81.7..185..6...53.6.8..9..........4..5.17 | 395128746867943152241657938729436581536281479418579623153762894972814365684395217 | Basic 9x9 Sudoku 6427 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . 5 . . 8 7 4 .
. 6 7 . . 3 1 . .
2 . 1 . . . 9 . .
. . . . 3 6 . . .
. . . . 8 1 . 7 .
. 1 8 5 . . 6 . .
. 5 3 . 6 . 8 . .
9 . . . . . . . .
. . 4 . . 5 . 1 7 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 395128746867943152241657938729436581536281479418579623153762894972814365684395217 #1 Easy (232)
Naked Single: r3c3=1
Naked Single: r1c1=3
Naked Single: r1c2=9
Hidden Single: r4c9=1
Hidden Single: r9c1=6
Naked Single: r8c3=2
Naked Single: r4c3=9
Full House: r5c3=6
Naked Single: r9c2=8
Naked... |
normal_sudoku_1328 | 7.2.3...8...52...11.3........8.5.......7..612.2...1..92...4..5....3......4....9.6 | 752136498984527361163894275618952743495783612327461589239648157576319824841275936 | Basic 9x9 Sudoku 1328 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 7 . 2 . 3 . . . 8
. . . 5 2 . . . 1
1 . 3 . . . . . .
. . 8 . 5 . . . .
. . . 7 . . 6 1 2
. 2 . . . 1 . . 9
2 . . . 4 . . 5 .
. . . 3 . . . . .
. 4 . . . . 9 . 6 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 752136498984527361163894275618952743495783612327461589239648157576319824841275936 #1 Unfair (1438)
Hidden Single: r1c3=2
Hidden Single: r1c4=1
Hidden Single: r4c2=1
Hidden Single: r6c7=5
Naked Single: r1c7=4
Hidden Single: r3c9=5
Hidden Single: r6c3=7
Hidden Single: r1c2=5
Hidden Single: r6c8... |
normal_sudoku_3478 | 4..2...1.....17.....1.482.31..9...2.9.64.....35..6......93......1..2..4.2....43.. | 475239618832617495691548273184973526926485137357162984749351862513826749268794351 | Basic 9x9 Sudoku 3478 | 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 .
. . . . 1 7 . . .
. . 1 . 4 8 2 . 3
1 . . 9 . . . 2 .
9 . 6 4 . . . . .
3 5 . . 6 . . . .
. . 9 3 . . . . .
. 1 . . 2 . . 4 .
2 . . . . 4 3 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 475239618832617495691548273184973526926485137357162984749351862513826749268794351 #1 Extreme (4116)
Hidden Single: r3c3=1
Hidden Single: r7c9=2
Hidden Single: r7c2=4
Hidden Single: r5c8=3
Hidden Single: r8c3=3
Hidden Single: r2c2=3
Hidden Single: r2c3=2
Hidden Single: r5c2=2
Hidden Single: r6... |
normal_sudoku_998 | .7..9...2..26.4...9......4...9.4..7.7...36......1..8.......53....648..9...7....28 | 674391582812654937953827146369548271781236459425179863298765314136482795547913628 | Basic 9x9 Sudoku 998 | 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 . . . 2
. . 2 6 . 4 . . .
9 . . . . . . 4 .
. . 9 . 4 . . 7 .
7 . . . 3 6 . . .
. . . 1 . . 8 . .
. . . . . 5 3 . .
. . 6 4 8 . . 9 .
. . 7 . . . . 2 8 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 674391582812654937953827146369548271781236459425179863298765314136482795547913628 #1 Extreme (25140) bf
Almost Locked Set XY-Wing: A=r2c1258 {13578}, B=r134589c7 {1245679}, C=r6c123589 {2345679}, X,Y=7,9, Z=1,5 => r2c7<>1, r2c7<>5
Forcing Chain Contradiction in c6 => r7c2<>2
r7c2=2 r7c2<>9 r7c4=9 r7c4<>7 r3c4=7... |
normal_sudoku_3825 | ...8..2.328...94....3.24.8.49.2...3.1....7.....6...7..5....2..1....5.64..4.9...2. | 914876253285139467673524189497215836132687594856493712568342971329751648741968325 | Basic 9x9 Sudoku 3825 | 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 . 3
2 8 . . . 9 4 . .
. . 3 . 2 4 . 8 .
4 9 . 2 . . . 3 .
1 . . . . 7 . . .
. . 6 . . . 7 . .
5 . . . . 2 . . 1
. . . . 5 . 6 4 .
. 4 . 9 . . . 2 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 914876253285139467673524189497215836132687594856493712568342971329751648741968325 #1 Extreme (11682)
Hidden Single: r3c5=2
Hidden Single: r4c3=7
Hidden Single: r1c3=4
Locked Candidates Type 1 (Pointing): 9 in b1 => r8c1<>9
Hidden Pair: 2,4 in r56c9 => r56c9<>5, r5c9<>6, r56c9<>8, r56c9<>9
Finned Frank... |
normal_sudoku_1580 | 63..5......9..73..7..3....49.....2.....12...6..2.45..8..75......9...38..8...1.... | 638254719419867325725391684956738241384129576172645938247586193591473862863912457 | Basic 9x9 Sudoku 1580 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 6 3 . . 5 . . . .
. . 9 . . 7 3 . .
7 . . 3 . . . . 4
9 . . . . . 2 . .
. . . 1 2 . . . 6
. . 2 . 4 5 . . 8
. . 7 5 . . . . .
. 9 . . . 3 8 . .
8 . . . 1 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 638254719419867325725391684956738241384129576172645938247586193591473862863912457 #1 Extreme (37806) bf
Turbot Fish: 3 r6c8 =3= r6c1 -3- r7c1 =3= r9c3 => r9c8<>3
Brute Force: r5c5=2
Hidden Single: r4c5=3
Hidden Single: r8c5=7
Locked Candidates Type 1 (Pointing): 3 in b6 => r7c8<>3
W-Wing: 6/8 in r2c5,... |
normal_sudoku_232 | .7.1.56.2..267..5.1.....3.932..6.7...954..82.........1..9.46.87.4.25.......9..... | 978135642432679158156824379321568794795413826684792531519346287847251963263987415 | Basic 9x9 Sudoku 232 | 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 . 1 . 5 6 . 2
. . 2 6 7 . . 5 .
1 . . . . . 3 . 9
3 2 . . 6 . 7 . .
. 9 5 4 . . 8 2 .
. . . . . . . . 1
. . 9 . 4 6 . 8 7
. 4 . 2 5 . . . .
. . . 9 . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 978135642432679158156824379321568794795413826684792531519346287847251963263987415 #1 Easy (204)
Naked Single: r5c7=8
Naked Single: r1c8=4
Naked Single: r3c4=8
Naked Single: r7c4=3
Naked Single: r2c7=1
Naked Single: r2c9=8
Full House: r3c8=7
Naked Single: r4c8=9
Naked Single: r3c5=2
Naked S... |
normal_sudoku_614 | .......14...71.59.5...942...3..4..79.8....452..2..7.........92..4....7.1..9.21..5 | 927358614364712598518694237135246879786139452492587163851473926243965781679821345 | Basic 9x9 Sudoku 614 | 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 . 5 9 .
5 . . . 9 4 2 . .
. 3 . . 4 . . 7 9
. 8 . . . . 4 5 2
. . 2 . . 7 . . .
. . . . . . 9 2 .
. 4 . . . . 7 . 1
. . 9 . 2 1 . . 5 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 927358614364712598518694237135246879786139452492587163851473926243965781679821345 #1 Extreme (32680) bf
Hidden Single: r5c9=2
Hidden Single: r6c1=4
Hidden Single: r7c4=4
Hidden Single: r9c8=4
Hidden Single: r2c3=4
Hidden Single: r3c9=7
Hidden Single: r8c1=2
Hidden Single: r7c5=7
Locked Candid... |
normal_sudoku_3543 | ..23....6....7.8...1..9..7...32....92...541..84.......5....9..3...5..6....6.23... | 472381956935672814618495372753216489269854137841937265584169723327548691196723548 | Basic 9x9 Sudoku 3543 | 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
. . . . 7 . 8 . .
. 1 . . 9 . . 7 .
. . 3 2 . . . . 9
2 . . . 5 4 1 . .
8 4 . . . . . . .
5 . . . . 9 . . 3
. . . 5 . . 6 . .
. . 6 . 2 3 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 472381956935672814618495372753216489269854137841937265584169723327548691196723548 #1 Extreme (21180) bf
Almost Locked Set XY-Wing: A=r3c13469 {234568}, B=r1479c7 {24579}, C=r8c135689 {1234789}, X,Y=2,3, Z=4,5 => r3c7<>4, r3c7<>5
Brute Force: r5c5=5
Hidden Single: r5c8=3
Hidden Single: r6c5=3
Hidden Singl... |
normal_sudoku_3510 | .7...6.2.........5..1.8......4....5..8..2.39.9.36.8.414.2.37..9....625...3.8...7. | 578416923346279815291583467764391258185724396923658741452137689817962534639845172 | Basic 9x9 Sudoku 3510 | 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 . . . 6 . 2 .
. . . . . . . . 5
. . 1 . 8 . . . .
. . 4 . . . . 5 .
. 8 . . 2 . 3 9 .
9 . 3 6 . 8 . 4 1
4 . 2 . 3 7 . . 9
. . . . 6 2 5 . .
. 3 . 8 . . . 7 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 578416923346279815291583467764391258185724396923658741452137689817962534639845172 #1 Extreme (3402)
Hidden Single: r6c3=3
Locked Candidates Type 1 (Pointing): 8 in b7 => r8c89<>8
Hidden Pair: 7,8 in r8c13 => r8c1<>1, r8c3<>9
Skyscraper: 5 in r6c5,r7c4 (connected by r67c2) => r5c4,r9c5<>5
Finned Swordfish... |
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