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_917 | ...6....8.1.....9.3....5.16.47.......2...17..5..24..31.7.3.916....1....9....2...7 | 459613278716482593382795416147938625923561784568247931874359162235176849691824357 | Basic 9x9 Sudoku 917 | 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
. 1 . . . . . 9 .
3 . . . . 5 . 1 6
. 4 7 . . . . . .
. 2 . . . 1 7 . .
5 . . 2 4 . . 3 1
. 7 . 3 . 9 1 6 .
. . . 1 . . . . 9
. . . . 2 . . . 7 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 459613278716482593382795416147938625923561784568247931874359162235176849691824357 #1 Easy (340)
Naked Single: r6c9=1
Hidden Single: r1c5=1
Hidden Single: r6c6=7
Hidden Single: r5c3=3
Hidden Single: r1c8=7
Hidden Single: r2c9=3
Hidden Single: r4c1=1
Hidden Single: r9c3=1
Hidden Single: r8c5=7
... |
normal_sudoku_2417 | .46..5.2.5.8....672.........8.2...5.....31.487....8...8.24...7.45....2...6.8..4.. | 346975821518324967279186534681247359925631748734598612892463175453719286167852493 | Basic 9x9 Sudoku 2417 | 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 . . 5 . 2 .
5 . 8 . . . . 6 7
2 . . . . . . . .
. 8 . 2 . . . 5 .
. . . . 3 1 . 4 8
7 . . . . 8 . . .
8 . 2 4 . . . 7 .
4 5 . . . . 2 . .
. 6 . 8 . . 4 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 346975821518324967279186534681247359925631748734598612892463175453719286167852493 #1 Extreme (24014) bf
Hidden Single: r4c2=8
Hidden Single: r5c2=2
Hidden Single: r6c9=2
Hidden Single: r3c2=7
Hidden Single: r8c8=8
Hidden Single: r3c9=4
Hidden Single: r3c7=5
Hidden Single: r3c5=8
Hidden Single... |
normal_sudoku_966 | .9.45178......9..3..5.3..14......3..64.5...9..57.......8...5.6.....6.12...69..5.7 | 293451786174689253865237914928146375641573892357892641782315469539764128416928537 | Basic 9x9 Sudoku 966 | 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 . 4 5 1 7 8 .
. . . . . 9 . . 3
. . 5 . 3 . . 1 4
. . . . . . 3 . .
6 4 . 5 . . . 9 .
. 5 7 . . . . . .
. 8 . . . 5 . 6 .
. . . . 6 . 1 2 .
. . 6 9 . . 5 . 7 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 293451786174689253865237914928146375641573892357892641782315469539764128416928537 #1 Hard (612)
Naked Single: r1c8=8
Naked Single: r7c9=9
Naked Single: r2c8=5
Naked Single: r6c8=4
Naked Single: r7c7=4
Naked Single: r8c9=8
Full House: r9c8=3
Full House: r4c8=7
Hidden Single: r3c7=9
Hidden S... |
normal_sudoku_1123 | 75..6..232.3...5.....3....1........7...6.....97.....45.9..4.3..1.7..9........821. | 758961423213784596469352781321495867845617932976823145592146378187239654634578219 | Basic 9x9 Sudoku 1123 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 7 5 . . 6 . . 2 3
2 . 3 . . . 5 . .
. . . 3 . . . . 1
. . . . . . . . 7
. . . 6 . . . . .
9 7 . . . . . 4 5
. 9 . . 4 . 3 . .
1 . 7 . . 9 . . .
. . . . . 8 2 1 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 758961423213784596469352781321495867845617932976823145592146378187239654634578219 #1 Hard (838)
Hidden Single: r1c9=3
Hidden Single: r7c6=6
Naked Single: r7c9=8
Naked Single: r7c1=5
Naked Single: r7c3=2
Naked Single: r7c8=7
Full House: r7c4=1
Hidden Single: r5c9=2
Hidden Single: r3c7=7
Hid... |
normal_sudoku_993 | ....7...8..96.......41.5....37....54..8.5...9.9.4.73...758.94.38.3.42...9......7. | 126374598359628147784195236237981654468253719591467382675819423813742965942536871 | Basic 9x9 Sudoku 993 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . . 7 . . . 8
. . 9 6 . . . . .
. . 4 1 . 5 . . .
. 3 7 . . . . 5 4
. . 8 . 5 . . . 9
. 9 . 4 . 7 3 . .
. 7 5 8 . 9 4 . 3
8 . 3 . 4 2 . . .
9 . . . . . . 7 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 126374598359628147784195236237981654468253719591467382675819423813742965942536871 #1 Extreme (7726)
Naked Single: r7c4=8
Hidden Single: r6c1=5
Hidden Single: r9c2=4
Hidden Single: r5c1=4
Hidden Single: r5c7=7
Hidden Single: r8c4=7
Hidden Single: r6c8=8
Hidden Single: r9c7=8
Hidden Single: r9c... |
normal_sudoku_2779 | ..2..763...7.219.4.4.3....2..6..92......5..6.8......9...9......71...6..926....1.. | 582947631637821954941365782376489215194752863825613497459178326718236549263594178 | Basic 9x9 Sudoku 2779 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . 2 . . 7 6 3 .
. . 7 . 2 1 9 . 4
. 4 . 3 . . . . 2
. . 6 . . 9 2 . .
. . . . 5 . . 6 .
8 . . . . . . 9 .
. . 9 . . . . . .
7 1 . . . 6 . . 9
2 6 . . . . 1 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 582947631637821954941365782376489215194752863825613497459178326718236549263594178 #1 Extreme (36744) bf
Hidden Pair: 6,9 in r3c15 => r3c1<>1, r3c1<>5, r3c5<>8
Brute Force: r5c8=6
Hidden Single: r7c9=6
2-String Kite: 1 in r1c1,r4c8 (connected by r1c9,r3c8) => r4c1<>1
Brute Force: r5c7=8
Discontinuous N... |
normal_sudoku_4505 | ...1.52.7..1.2...9......18...8.1.5....54.67..9........28...1...5.9....2..17...8.5 | 893145267461728359752369184348217596125496738976583412284651973539874621617932845 | Basic 9x9 Sudoku 4505 | 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 2 . 7
. . 1 . 2 . . . 9
. . . . . . 1 8 .
. . 8 . 1 . 5 . .
. . 5 4 . 6 7 . .
9 . . . . . . . .
2 8 . . . 1 . . .
5 . 9 . . . . 2 .
. 1 7 . . . 8 . 5 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 893145267461728359752369184348217596125496738976583412284651973539874621617932845 #1 Extreme (13922) bf
Hidden Single: r1c4=1
Hidden Single: r5c1=1
Hidden Single: r8c9=1
Hidden Single: r7c8=7
Hidden Single: r7c7=9
Hidden Single: r3c2=5
Hidden Single: r2c8=5
Hidden Single: r6c8=1
Hidden Single... |
normal_sudoku_2539 | 7.5..4..6.2.....7....8...............5.43....973..6.4..3..4..95.1.....644.9..57.. | 795214836628953471341867529284179653156432987973586142837641295512798364469325718 | Basic 9x9 Sudoku 2539 | 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 . . 4 . . 6
. 2 . . . . . 7 .
. . . 8 . . . . .
. . . . . . . . .
. 5 . 4 3 . . . .
9 7 3 . . 6 . 4 .
. 3 . . 4 . . 9 5
. 1 . . . . . 6 4
4 . 9 . . 5 7 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 795214836628953471341867529284179653156432987973586142837641295512798364469325718 #1 Extreme (14226) bf
Hidden Single: r7c5=4
Hidden Single: r8c1=5
Brute Force: r4c8=5
Naked Triple: 1,2,8 in r5c8,r6c79 => r4c79,r5c79<>1, r4c79,r5c79<>2, r4c79,r5c79<>8
Hidden Pair: 4,5 in r23c7 => r23c7<>1, r23c7<>3, r2c7... |
normal_sudoku_2332 | ..7.3946...9.4...7.487..52.2.....1.............5.87..2.8..5.......1....676.4..8.. | 157239468629845317348716529273964185896521734415387692984653271532178946761492853 | Basic 9x9 Sudoku 2332 | 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 . 3 9 4 6 .
. . 9 . 4 . . . 7
. 4 8 7 . . 5 2 .
2 . . . . . 1 . .
. . . . . . . . .
. . 5 . 8 7 . . 2
. 8 . . 5 . . . .
. . . 1 . . . . 6
7 6 . 4 . . 8 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 157239468629845317348716529273964185896521734415387692984653271532178946761492853 #1 Hard (720)
Naked Single: r1c7=4
Naked Single: r2c7=3
Hidden Single: r3c9=9
Hidden Single: r5c1=8
Hidden Single: r8c5=7
Hidden Single: r8c6=8
Hidden Single: r3c1=3
Hidden Single: r2c1=6
Locked Candidates Type ... |
normal_sudoku_4247 | .........326....9..793.........8...4..84.153.7..6.....9..2...6......41.9....5...8 | 581927643326845791479316285163582974298471536754693812915238467832764159647159328 | Basic 9x9 Sudoku 4247 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . . . . . . .
3 2 6 . . . . 9 .
. 7 9 3 . . . . .
. . . . 8 . . . 4
. . 8 4 . 1 5 3 .
7 . . 6 . . . . .
9 . . 2 . . . 6 .
. . . . . 4 1 . 9
. . . . 5 . . . 8 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 581927643326845791479316285163582974298471536754693812915238467832764159647159328 #1 Extreme (46764) bf
Brute Force: r5c4=4
Discontinuous Nice Loop: 9 r6c2 -9- r6c7 =9= r4c7 =6= r5c9 -6- r5c2 -9- r6c2 => r6c2<>9
Brute Force: r5c2=9
Discontinuous Nice Loop: 7 r1c5 -7- r5c5 =7= r5c9 =6= r4c7 =9= r6c7 -9- r6c5... |
normal_sudoku_1208 | .3...2..5..24..1..7...9.62......846...65...81.....65.2.5...7...9...3......16..8.. | 139862745862475193745391628513928467276543981498716532654287319987134256321659874 | Basic 9x9 Sudoku 1208 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . 3 . . . 2 . . 5
. . 2 4 . . 1 . .
7 . . . 9 . 6 2 .
. . . . . 8 4 6 .
. . 6 5 . . . 8 1
. . . . . 6 5 . 2
. 5 . . . 7 . . .
9 . . . 3 . . . .
. . 1 6 . . 8 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 139862745862475193745391628513928467276543981498716532654287319987134256321659874 #1 Extreme (7738)
Hidden Single: r3c8=2
Empty Rectangle: 3 in b7 (r57c7) => r5c1<>3
Discontinuous Nice Loop: 2 r8c2 -2- r8c7 -7- r1c7 -9- r1c3 =9= r2c2 =6= r8c2 => r8c2<>2
Grouped Discontinuous Nice Loop: 4 r7c8 -4- r1c8 =4= r... |
normal_sudoku_2503 | ......9475.6...2.....2.....3.2.7....87......3.1.9.........2...6.3.6..592...85.1.4 | 283165947546793281791284365362578419879412653415936728954321876138647592627859134 | Basic 9x9 Sudoku 2503 | 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 4 7
5 . 6 . . . 2 . .
. . . 2 . . . . .
3 . 2 . 7 . . . .
8 7 . . . . . . 3
. 1 . 9 . . . . .
. . . . 2 . . . 6
. 3 . 6 . . 5 9 2
. . . 8 5 . 1 . 4 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 283165947546793281791284365362578419879412653415936728954321876138647592627859134 #1 Hard (724)
Naked Single: r9c9=4
Hidden Single: r5c3=9
Naked Single: r9c3=7
Naked Single: r9c8=3
Naked Single: r9c6=9
Hidden Single: r4c9=9
Hidden Single: r8c3=8
Hidden Single: r3c1=7
Hidden Single: r8c6=7
... |
normal_sudoku_5220 | ...13..56..9....875..6.82...96.....2...24....8..965.7..2..1.....78....2.6..7.2..5 | 284137956169524387537698214396871542751243869842965173925416738478359621613782495 | Basic 9x9 Sudoku 5220 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . 1 3 . . 5 6
. . 9 . . . . 8 7
5 . . 6 . 8 2 . .
. 9 6 . . . . . 2
. . . 2 4 . . . .
8 . . 9 6 5 . 7 .
. 2 . . 1 . . . .
. 7 8 . . . . 2 .
6 . . 7 . 2 . . 5 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 284137956169524387537698214396871542751243869842965173925416738478359621613782495 #1 Extreme (2598)
Naked Single: r6c5=6
Naked Single: r2c6=4
Naked Single: r2c4=5
Naked Single: r2c5=2
Hidden Single: r4c7=5
Hidden Single: r6c3=2
Hidden Single: r1c2=8
Hidden Single: r2c2=6
Hidden Single: r7c7=7... |
normal_sudoku_4233 | 8.6.5...22.96..5...5.......7...1.4.......7.2..2.8...76..37842...8.9....44...3..1. | 876453192219678543354129687738216459645397821921845376193784265582961734467532918 | Basic 9x9 Sudoku 4233 | 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 . 5 . . . 2
2 . 9 6 . . 5 . .
. 5 . . . . . . .
7 . . . 1 . 4 . .
. . . . . 7 . 2 .
. 2 . 8 . . . 7 6
. . 3 7 8 4 2 . .
. 8 . 9 . . . . 4
4 . . . 3 . . 1 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 876453192219678543354129687738216459645397821921845376193784265582961734467532918 #1 Extreme (3302)
Hidden Single: r7c7=2
Hidden Single: r8c6=1
Locked Candidates Type 1 (Pointing): 5 in b8 => r9c39<>5
Skyscraper: 7 in r1c2,r8c3 (connected by r18c7) => r3c3,r9c2<>7
Hidden Pair: 2,7 in r89c3 => r8c3<>5
... |
normal_sudoku_1306 | .1.62..9...9.7...1.....38......4.1...2.9...7.43..12....76.8431..83....52..1...... | 314628795869475231752193846695847123128936574437512968576284319983761452241359687 | Basic 9x9 Sudoku 1306 | 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 . 6 2 . . 9 .
. . 9 . 7 . . . 1
. . . . . 3 8 . .
. . . . 4 . 1 . .
. 2 . 9 . . . 7 .
4 3 . . 1 2 . . .
. 7 6 . 8 4 3 1 .
. 8 3 . . . . 5 2
. . 1 . . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 314628795869475231752193846695847123128936574437512968576284319983761452241359687 #1 Easy (402)
Naked Single: r7c8=1
Naked Single: r7c9=9
Naked Single: r8c1=9
Naked Single: r8c5=6
Hidden Single: r3c5=9
Hidden Single: r3c4=1
Naked Single: r8c4=7
Naked Single: r8c6=1
Full House: r8c7=4
Hidde... |
normal_sudoku_2823 | .5..7....41....2....3..5...1..25.7.4...841.9...8...1.5.9..3.4.6.7..2......4.6.... | 956472813417683259823915647139256784765841392248397165592138476671524938384769521 | Basic 9x9 Sudoku 2823 | 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 . . 7 . . . .
4 1 . . . . 2 . .
. . 3 . . 5 . . .
1 . . 2 5 . 7 . 4
. . . 8 4 1 . 9 .
. . 8 . . . 1 . 5
. 9 . . 3 . 4 . 6
. 7 . . 2 . . . .
. . 4 . 6 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 956472813417683259823915647139256784765841392248397165592138476671524938384769521 #1 Extreme (1970)
Naked Single: r5c5=4
Naked Single: r6c5=9
Naked Single: r2c5=8
Full House: r3c5=1
Hidden Single: r4c8=8
Hidden Single: r2c8=5
Hidden Single: r1c6=2
Hidden Single: r6c2=4
Hidden Single: r4c3=9
... |
normal_sudoku_5227 | .824..6......2..5...7.68......9...8.8....4....94.8.2..3........7...4...1.68..29.. | 182495637643721859957368142276913584831254796594687213319576428725849361468132975 | Basic 9x9 Sudoku 5227 | 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 4 . . 6 . .
. . . . 2 . . 5 .
. . 7 . 6 8 . . .
. . . 9 . . . 8 .
8 . . . . 4 . . .
. 9 4 . 8 . 2 . .
3 . . . . . . . .
7 . . . 4 . . . 1
. 6 8 . . 2 9 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 182495637643721859957368142276913584831254796594687213319576428725849361468132975 #1 Extreme (43938) bf
Hidden Single: r5c1=8
Hidden Single: r5c4=2
Hidden Single: r4c1=2
Locked Candidates Type 1 (Pointing): 9 in b7 => r2c3<>9
Brute Force: r5c7=7
Hidden Single: r4c2=7
Forcing Net Contradiction in c5... |
normal_sudoku_6883 | 2...1...8..98...7..31..75.....9....51...2.....9...37..31...4..7.6.....54..46..3.. | 247519638659832471831467592473986125186725943592143786315294867968371254724658319 | Basic 9x9 Sudoku 6883 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 2 . . . 1 . . . 8
. . 9 8 . . . 7 .
. 3 1 . . 7 5 . .
. . . 9 . . . . 5
1 . . . 2 . . . .
. 9 . . . 3 7 . .
3 1 . . . 4 . . 7
. 6 . . . . . 5 4
. . 4 6 . . 3 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 247519638659832471831467592473986125186725943592143786315294867968371254724658319 #1 Extreme (12242)
Hidden Single: r3c3=1
Hidden Single: r3c1=8
Almost Locked Set XZ-Rule: A=r2c126 {2456}, B=r3c4 {24}, X=2, Z=4 => r2c5<>4
Forcing Chain Contradiction in r2 => r5c4<>4
r5c4=4 r3c4<>4 r3c4=2 r2c6<>2
r5c4=4 ... |
normal_sudoku_587 | 3864.7..57...291..........8..1398..7..21..8....7.6...1..4.....9.9..324.......6... | 386417295745829163219653748451398627962175834837264951624581379598732416173946582 | Basic 9x9 Sudoku 587 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 3 8 6 4 . 7 . . 5
7 . . . 2 9 1 . .
. . . . . . . . 8
. . 1 3 9 8 . . 7
. . 2 1 . . 8 . .
. . 7 . 6 . . . 1
. . 4 . . . . . 9
. 9 . . 3 2 4 . .
. . . . . 6 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 386417295745829163219653748451398627962175834837264951624581379598732416173946582 #1 Easy (262)
Naked Single: r1c4=4
Naked Single: r2c3=5
Naked Single: r8c9=6
Naked Single: r1c5=1
Naked Single: r2c2=4
Naked Single: r3c3=9
Naked Single: r8c3=8
Full House: r9c3=3
Naked Single: r3c5=5
Naked S... |
normal_sudoku_1600 | 1.48.....2..5.6..336.......8..2......237....4.4..1..6.....5..........92.78.49..56 | 154839672279546813368127549891264735623785194547913268916352487435678921782491356 | Basic 9x9 Sudoku 1600 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 1 . 4 8 . . . . .
2 . . 5 . 6 . . 3
3 6 . . . . . . .
8 . . 2 . . . . .
. 2 3 7 . . . . 4
. 4 . . 1 . . 6 .
. . . . 5 . . . .
. . . . . . 9 2 .
7 8 . 4 9 . . 5 6 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 154839672279546813368127549891264735623785194547913268916352487435678921782491356 #1 Unfair (1310)
Naked Single: r9c1=7
Hidden Single: r8c1=4
Hidden Single: r1c7=6
Locked Candidates Type 1 (Pointing): 1 in b2 => r3c789<>1
Locked Candidates Type 1 (Pointing): 1 in b4 => r4c789<>1
Locked Candidates Type... |
normal_sudoku_5533 | ........7..9.6...41..8..6.5..35.1...9..32.5.1.......4.2....61.88.62...7..9..8.... | 468159327359762814127834695673541982984327561512698743245976138836215479791483256 | Basic 9x9 Sudoku 5533 | 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 . 6 . . . 4
1 . . 8 . . 6 . 5
. . 3 5 . 1 . . .
9 . . 3 2 . 5 . 1
. . . . . . . 4 .
2 . . . . 6 1 . 8
8 . 6 2 . . . 7 .
. 9 . . 8 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 468159327359762814127834695673541982984327561512698743245976138836215479791483256 #1 Extreme (18036) bf
Almost Locked Set XZ-Rule: A=r8c679 {3459}, B=r3467c5 {34579}, X=5, Z=3,4,9 => r8c5<>3, r8c5<>4, r8c5<>9
Brute Force: r5c4=3
Hidden Single: r6c4=6
Empty Rectangle: 9 in b3 (r17c4) => r7c8<>9
Locked Can... |
normal_sudoku_3637 | 8.52.3.4.4..8....3.3......7.4.3.1.7.5.....3.2..9.6....7864.2.591.3.......5.7..... | 875293641461875293932146587648321975517984362329567418786432159193658724254719836 | Basic 9x9 Sudoku 3637 | 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 . 3 . 4 .
4 . . 8 . . . . 3
. 3 . . . . . . 7
. 4 . 3 . 1 . 7 .
5 . . . . . 3 . 2
. . 9 . 6 . . . .
7 8 6 4 . 2 . 5 9
1 . 3 . . . . . .
. 5 . 7 . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 875293641461875293932146587648321975517984362329567418786432159193658724254719836 #1 Easy (208)
Naked Single: r7c6=2
Naked Single: r5c4=9
Naked Single: r6c4=5
Naked Single: r7c7=1
Full House: r7c5=3
Naked Single: r8c4=6
Full House: r3c4=1
Naked Single: r3c3=2
Naked Single: r4c3=8
Naked Sin... |
normal_sudoku_148 | 5...68...67.5..8.....1........7..1.6.9....5.8..3.9.274.8.......96.25...33.2...6.. | 521968347679534812438127965254783196796412538813695274185346729967251483342879651 | Basic 9x9 Sudoku 148 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 5 . . . 6 8 . . .
6 7 . 5 . . 8 . .
. . . 1 . . . . .
. . . 7 . . 1 . 6
. 9 . . . . 5 . 8
. . 3 . 9 . 2 7 4
. 8 . . . . . . .
9 6 . 2 5 . . . 3
3 . 2 . . . 6 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 521968347679534812438127965254783196796412538813695274185346729967251483342879651 #1 Medium (526)
Naked Single: r6c9=4
Naked Single: r5c8=3
Full House: r4c8=9
Hidden Single: r5c3=6
Naked Single: r5c4=4
Hidden Single: r8c8=8
Hidden Single: r3c8=6
Hidden Single: r5c1=7
Hidden Single: r3c9=5
... |
normal_sudoku_5629 | 7..3...41..1.5....43...1.5...3..7.899...8..1....9..4.....6..8....8..5.73.2.....6. | 785326941261459738439871652143267589972584316856913427517632894698145273324798165 | Basic 9x9 Sudoku 5629 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 7 . . 3 . . . 4 1
. . 1 . 5 . . . .
4 3 . . . 1 . 5 .
. . 3 . . 7 . 8 9
9 . . . 8 . . 1 .
. . . 9 . . 4 . .
. . . 6 . . 8 . .
. . 8 . . 5 . 7 3
. 2 . . . . . 6 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 785326941261459738439871652143267589972584316856913427517632894698145273324798165 #1 Extreme (25244) bf
Forcing Net Contradiction in r7c8 => r6c1<>6
r6c1=6 (r8c1<>6 r8c2=6 r2c2<>6) r6c1<>8 r6c2=8 r2c2<>8 r2c2=9 (r2c6<>9) (r1c3<>9) (r3c3<>9) r2c8<>9 r7c8=9 (r7c6<>9) r7c3<>9 r9c3=9 r9c6<>9 r1c6=9 r1c6<>8 r1c2=8 r6c2... |
normal_sudoku_6551 | 6138..5..8...........3...48..51..8.....5.64.3....4..1.9.7.8.3.......3..6....5.1.. | 613824579874965231592317648425139867189576423736248915947681352251493786368752194 | Basic 9x9 Sudoku 6551 | 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 1 3 8 . . 5 . .
8 . . . . . . . .
. . . 3 . . . 4 8
. . 5 1 . . 8 . .
. . . 5 . 6 4 . 3
. . . . 4 . . 1 .
9 . 7 . 8 . 3 . .
. . . . . 3 . . 6
. . . . 5 . 1 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 613824579874965231592317648425139867189576423736248915947681352251493786368752194 #1 Extreme (14306) bf
Hidden Single: r3c9=8
Hidden Single: r1c6=4
Hidden Single: r6c9=5
Hidden Single: r6c6=8
Hidden Single: r2c8=3
Hidden Single: r4c5=3
Hidden Single: r7c6=1
Hidden Single: r2c9=1
Hidden Single... |
normal_sudoku_701 | ..9.5.3....3.87..4.4..1..56......24.5....4..7.....9.38.2....8...96.....23.52....9 | 679452381153687924842913756917836245538124697264579138421795863796348512385261479 | Basic 9x9 Sudoku 701 | 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 . 5 . 3 . .
. . 3 . 8 7 . . 4
. 4 . . 1 . . 5 6
. . . . . . 2 4 .
5 . . . . 4 . . 7
. . . . . 9 . 3 8
. 2 . . . . 8 . .
. 9 6 . . . . . 2
3 . 5 2 . . . . 9 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 679452381153687924842913756917836245538124697264579138421795863796348512385261479 #1 Hard (1056)
Naked Single: r3c9=6
Naked Single: r1c9=1
Naked Single: r2c7=9
Naked Single: r4c9=5
Full House: r7c9=3
Naked Single: r2c4=6
Naked Single: r2c8=2
Naked Single: r3c7=7
Full House: r1c8=8
Naked Si... |
normal_sudoku_4220 | ..41...6..96....21....9.4..8.3..7....4.9..67.........8....53.....7.1..5..2.4..1.. | 784125369396748521152396487813267945245981673679534218461853792937612854528479136 | Basic 9x9 Sudoku 4220 | 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 . . . 6 .
. 9 6 . . . . 2 1
. . . . 9 . 4 . .
8 . 3 . . 7 . . .
. 4 . 9 . . 6 7 .
. . . . . . . . 8
. . . . 5 3 . . .
. . 7 . 1 . . 5 .
. 2 . 4 . . 1 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 784125369396748521152396487813267945245981673679534218461853792937612854528479136 #1 Extreme (29766) bf
Locked Candidates Type 1 (Pointing): 9 in b4 => r6c78<>9
Brute Force: r5c8=7
Forcing Net Contradiction in c9 => r3c4<>8
r3c4=8 (r8c4<>8) (r1c5<>8) (r1c6<>8) (r2c4<>8) (r2c5<>8) r2c6<>8 r2c7=8 (r8c7<>8) r1c... |
normal_sudoku_5468 | ..37..9.28....9.34...4..6..9..........8..4.93.3.95..2.2.41....8..9.......8...2.4. | 413786952826519734795423681942371865578264193631958427264195378359847216187632549 | Basic 9x9 Sudoku 5468 | 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 . 2
8 . . . . 9 . 3 4
. . . 4 . . 6 . .
9 . . . . . . . .
. . 8 . . 4 . 9 3
. 3 . 9 5 . . 2 .
2 . 4 1 . . . . 8
. . 9 . . . . . .
. 8 . . . 2 . 4 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 413786952826519734795423681942371865578264193631958427264195378359847216187632549 #1 Extreme (16546) bf
Hidden Single: r6c4=9
Hidden Single: r3c2=9
Hidden Single: r7c5=9
Hidden Single: r9c9=9
Hidden Single: r8c7=2
Hidden Single: r8c5=4
Locked Candidates Type 1 (Pointing): 8 in b3 => r4c8<>8
Hidd... |
normal_sudoku_1998 | ...9..7.69...72.5.4..6.529..4.79...5...2.4.......56...6....9.2.38.....4.....6.5.. | 521948736963172854478635291842793165756214983139856472615489327387521649294367518 | Basic 9x9 Sudoku 1998 | 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 . . 7 . 6
9 . . . 7 2 . 5 .
4 . . 6 . 5 2 9 .
. 4 . 7 9 . . . 5
. . . 2 . 4 . . .
. . . . 5 6 . . .
6 . . . . 9 . 2 .
3 8 . . . . . 4 .
. . . . 6 . 5 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 521948736963172854478635291842793165756214983139856472615489327387521649294367518 #1 Extreme (16488) bf
Hidden Single: r1c4=9
Hidden Single: r6c9=2
Hidden Single: r8c7=6
Hidden Single: r8c5=2
Hidden Single: r1c5=4
Hidden Single: r6c7=4
Hidden Single: r2c9=4
Hidden Single: r5c7=9
Brute Force: ... |
normal_sudoku_1164 | .3.....8....17.2...15......14.35......2....5...8.6...7.....96.8.694..3....38..7.. | 736294581984175236215683479147358962692741853358962147471539628869427315523816794 | Basic 9x9 Sudoku 1164 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . 3 . . . . . 8 .
. . . 1 7 . 2 . .
. 1 5 . . . . . .
1 4 . 3 5 . . . .
. . 2 . . . . 5 .
. . 8 . 6 . . . 7
. . . . . 9 6 . 8
. 6 9 4 . . 3 . .
. . 3 8 . . 7 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 736294581984175236215683479147358962692741853358962147471539628869427315523816794 #1 Easy (364)
Naked Single: r6c3=8
Hidden Single: r7c5=3
Hidden Single: r7c3=1
Hidden Single: r8c1=8
Hidden Single: r9c6=6
Hidden Single: r3c8=7
Hidden Single: r1c7=5
Hidden Single: r2c2=8
Hidden Single: r8c6=7
... |
normal_sudoku_1443 | .......8..9.5......2.13....6..42.3.99..8.3....34....2..4.38.26.86.........3..94.. | 375692184196548732428137596681425379952873641734916825549381267867254913213769458 | Basic 9x9 Sudoku 1443 | 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 .
. 9 . 5 . . . . .
. 2 . 1 3 . . . .
6 . . 4 2 . 3 . 9
9 . . 8 . 3 . . .
. 3 4 . . . . 2 .
. 4 . 3 8 . 2 6 .
8 6 . . . . . . .
. . 3 . . 9 4 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 375692184196548732428137596681425379952873641734916825549381267867254913213769458 #1 Extreme (13012) bf
Hidden Single: r5c6=3
Hidden Single: r5c3=2
Hidden Single: r4c2=8
Hidden Single: r9c1=2
Hidden Single: r7c3=9
Hidden Single: r9c9=8
Hidden Single: r6c7=8
Locked Candidates Type 1 (Pointing): 9... |
normal_sudoku_1259 | 2...53......92.7.64......2....6..51.81.........4..73.9.7834..9..4.7.1.5.....6...3 | 267153948185924736493876125732689514819435267654217389578342691346791852921568473 | Basic 9x9 Sudoku 1259 | 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 . . . 5 3 . . .
. . . 9 2 . 7 . 6
4 . . . . . . 2 .
. . . 6 . . 5 1 .
8 1 . . . . . . .
. . 4 . . 7 3 . 9
. 7 8 3 4 . . 9 .
. 4 . 7 . 1 . 5 .
. . . . 6 . . . 3 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 267153948185924736493876125732689514819435267654217389578342691346791852921568473 #1 Easy (402)
Naked Single: r7c5=4
Hidden Single: r4c1=7
Hidden Single: r1c3=7
Hidden Single: r3c5=7
Hidden Single: r3c9=5
Hidden Single: r3c6=6
Hidden Single: r2c8=3
Hidden Single: r9c8=7
Hidden Single: r5c9=7
... |
normal_sudoku_140 | ......9..47..1..2...2......24...7.1.1.8.4.....3.......6.4.217.5..3.762..7..4...6. | 315264987479518623862739154246397518198645372537182496684921735953876241721453869 | Basic 9x9 Sudoku 140 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . . . . 9 . .
4 7 . . 1 . . 2 .
. . 2 . . . . . .
2 4 . . . 7 . 1 .
1 . 8 . 4 . . . .
. 3 . . . . . . .
6 . 4 . 2 1 7 . 5
. . 3 . 7 6 2 . .
7 . . 4 . . . 6 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 315264987479518623862739154246397518198645372537182496684921735953876241721453869 #1 Extreme (23898) bf
Hidden Single: r4c2=4
Hidden Single: r6c4=1
Hidden Single: r9c2=2
Hidden Single: r6c3=7
Skyscraper: 1 in r1c3,r3c7 (connected by r9c37) => r1c9,r3c2<>1
Brute Force: r4c9=8
Finned Swordfish: 8 r26... |
normal_sudoku_1883 | .7.2.8...862.3..19.....1..819...3.8.6...9412...31....4..9..2.315.....8.2......9.. | 971248356862537419435961278194723685657894123283156794749682531516379842328415967 | Basic 9x9 Sudoku 1883 | 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 . 8 . . .
8 6 2 . 3 . . 1 9
. . . . . 1 . . 8
1 9 . . . 3 . 8 .
6 . . . 9 4 1 2 .
. . 3 1 . . . . 4
. . 9 . . 2 . 3 1
5 . . . . . 8 . 2
. . . . . . 9 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 971248356862537419435961278194723685657894123283156794749682531516379842328415967 #1 Hard (824)
Hidden Single: r2c1=8
Hidden Single: r1c3=1
Hidden Single: r3c4=9
Hidden Single: r3c7=2
Hidden Single: r4c5=2
Hidden Single: r5c9=3
Hidden Single: r4c3=4
Naked Single: r3c3=5
Hidden Single: r1c1=9
... |
normal_sudoku_903 | ..3......68...93..91..2..6...9..861...1.7.5...5......74..5..1....8..6.9.....8.4.6 | 523864971684719352917325864279458613341672589856931247462597138138246795795183426 | Basic 9x9 Sudoku 903 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . 3 . . . . . .
6 8 . . . 9 3 . .
9 1 . . 2 . . 6 .
. . 9 . . 8 6 1 .
. . 1 . 7 . 5 . .
. 5 . . . . . . 7
4 . . 5 . . 1 . .
. . 8 . . 6 . 9 .
. . . . 8 . 4 . 6 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 523864971684719352917325864279458613341672589856931247462597138138246795795183426 #1 Extreme (36246) bf
Brute Force: r5c7=5
Hidden Single: r4c5=5
Forcing Net Contradiction in c3 => r1c5=6
r1c5<>6 r1c4=6 (r1c4<>7) r1c4<>8 r3c4=8 (r3c4<>7) (r3c7<>8 r3c7=7 r3c6<>7) r3c4<>3 r3c6=3 r3c6<>5 r1c6=5 r1c6<>7 r2c4=7 r... |
normal_sudoku_2729 | ..5...37..1......57....561...1..3..7...21.9..8...9.....4.3..7....7.46..32....1.4. | 685129374412637895739485612921563487374218956856794231148352769597846123263971548 | Basic 9x9 Sudoku 2729 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . 5 . . . 3 7 .
. 1 . . . . . . 5
7 . . . . 5 6 1 .
. . 1 . . 3 . . 7
. . . 2 1 . 9 . .
8 . . . 9 . . . .
. 4 . 3 . . 7 . .
. . 7 . 4 6 . . 3
2 . . . . 1 . 4 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 685129374412637895739485612921563487374218956856794231148352769597846123263971548 #1 Extreme (29084) bf
Locked Candidates Type 1 (Pointing): 2 in b8 => r7c89<>2
Brute Force: r5c5=1
Hidden Single: r1c4=1
Brute Force: r5c6=8
Hidden Single: r5c2=7
Finned Franken Swordfish: 4 r35b5 c349 fr5c1 fr6c6 => r6c... |
normal_sudoku_5957 | 76...3..2..54..6......6....1.8...94...967.3.16....1.2535...72.82...5...7.......53 | 764593812835412679912768534178235946529674381643981725356147298281359467497826153 | Basic 9x9 Sudoku 5957 | 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 . . . 3 . . 2
. . 5 4 . . 6 . .
. . . . 6 . . . .
1 . 8 . . . 9 4 .
. . 9 6 7 . 3 . 1
6 . . . . 1 . 2 5
3 5 . . . 7 2 . 8
2 . . . 5 . . . 7
. . . . . . . 5 3 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 764593812835412679912768534178235946529674381643981725356147298281359467497826153 #1 Easy (204)
Naked Single: r6c9=5
Naked Single: r5c8=8
Naked Single: r2c9=9
Naked Single: r4c9=6
Full House: r6c7=7
Full House: r3c9=4
Naked Single: r1c8=1
Naked Single: r2c1=8
Naked Single: r1c3=4
Naked Sin... |
normal_sudoku_2158 | ..2...4.6.5...27.973...9.2.....5....5.7..3.4..8.1....5..3..4.6.9...8.1...6.9..... | 892715436651432789734869521349258617517693842286147395173524968925386174468971253 | Basic 9x9 Sudoku 2158 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . 2 . . . 4 . 6
. 5 . . . 2 7 . 9
7 3 . . . 9 . 2 .
. . . . 5 . . . .
5 . 7 . . 3 . 4 .
. 8 . 1 . . . . 5
. . 3 . . 4 . 6 .
9 . . . 8 . 1 . .
. 6 . 9 . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 892715436651432789734869521349258617517693842286147395173524968925386174468971253 #1 Hard (1230)
Hidden Single: r5c1=5
Hidden Single: r1c2=9
Hidden Single: r7c7=9
Hidden Single: r5c5=9
Hidden Single: r7c4=5
Hidden Single: r3c7=5
Hidden Single: r1c6=5
Hidden Single: r9c6=1
Hidden Single: r4c6=... |
normal_sudoku_4071 | .2..9.3....12...9.7.........8.42...3..58.124.2....6.8....6....58..7..4...5..4..3. | 426598317531267894798314652189425763365871249274936581942683175813759426657142938 | Basic 9x9 Sudoku 4071 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . 2 . . 9 . 3 . .
. . 1 2 . . . 9 .
7 . . . . . . . .
. 8 . 4 2 . . . 3
. . 5 8 . 1 2 4 .
2 . . . . 6 . 8 .
. . . 6 . . . . 5
8 . . 7 . . 4 . .
. 5 . . 4 . . 3 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 426598317531267894798314652189425763365871249274936581942683175813759426657142938 #1 Extreme (30432) bf
Brute Force: r5c4=8
Grouped Discontinuous Nice Loop: 7 r2c5 -7- r56c5 =7= r4c6 =9= r6c4 -9- r9c4 -1- r13c4 =1= r3c5 =6= r2c5 => r2c5<>7
Locked Candidates Type 1 (Pointing): 7 in b2 => r4c6<>7
Forcing Chai... |
normal_sudoku_822 | ...463.8..8.........2.5....53...9..8....2..5.1276.5394.5.....2...8...4.7.41..89.. | 975463182486192573312857649534719268869324751127685394753941826298536417641278935 | Basic 9x9 Sudoku 822 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . 4 6 3 . 8 .
. 8 . . . . . . .
. . 2 . 5 . . . .
5 3 . . . 9 . . 8
. . . . 2 . . 5 .
1 2 7 6 . 5 3 9 4
. 5 . . . . . 2 .
. . 8 . . . 4 . 7
. 4 1 . . 8 9 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 975463182486192573312857649534719268869324751127685394753941826298536417641278935 #1 Extreme (2318)
Naked Single: r6c2=2
Full House: r6c5=8
Hidden Single: r5c4=3
Hidden Single: r4c7=2
Hidden Single: r5c1=8
Hidden Single: r8c4=5
Hidden Single: r3c4=8
Hidden Single: r7c7=8
Hidden Single: r9c9=5... |
normal_sudoku_6027 | .94..3...3...6...4..2....3.4....2.6...9.5...8...1..7..2....9.8.58.7....19...8.5.. | 694273815318965274752418936475892163169357428823146759241539687586724391937681542 | Basic 9x9 Sudoku 6027 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . 9 4 . . 3 . . .
3 . . . 6 . . . 4
. . 2 . . . . 3 .
4 . . . . 2 . 6 .
. . 9 . 5 . . . 8
. . . 1 . . 7 . .
2 . . . . 9 . 8 .
5 8 . 7 . . . . 1
9 . . . 8 . 5 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 694273815318965274752418936475892163169357428823146759241539687586724391937681542 #1 Extreme (8204)
Hidden Single: r9c1=9
Hidden Single: r7c4=5
Locked Candidates Type 2 (Claiming): 5 in r1 => r2c8,r3c9<>5
Forcing Chain Contradiction in c6 => r2c3<>7
r2c3=7 r2c6<>7
r2c3=7 r2c3<>8 r13c1=8 r6c1<>8 r6c1=6 r... |
normal_sudoku_6646 | 3...1..4..574.3..1..69...37...8......6.5....37...3.4...9..2.78.2...7...4..13.8.2. | 329715648857463291146982537534897162962541873718236459693124785285679314471358926 | Basic 9x9 Sudoku 6646 | 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 .
. 5 7 4 . 3 . . 1
. . 6 9 . . . 3 7
. . . 8 . . . . .
. 6 . 5 . . . . 3
7 . . . 3 . 4 . .
. 9 . . 2 . 7 8 .
2 . . . 7 . . . 4
. . 1 3 . 8 . 2 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 329715648857463291146982537534897162962541873718236459693124785285679314471358926 #1 Easy (318)
Hidden Single: r2c3=7
Hidden Single: r1c4=7
Hidden Single: r9c2=7
Hidden Single: r7c3=3
Naked Single: r8c2=8
Naked Single: r1c2=2
Naked Single: r8c3=5
Naked Single: r6c2=1
Naked Single: r3c2=4
F... |
normal_sudoku_3253 | ...67.....74..38.636.2.417.......48.8..46..17..7.1...3.5.....6......63.1.9.8...4. | 981675234274193856365284179516739482839462517427518693152347968748956321693821745 | Basic 9x9 Sudoku 3253 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . 6 7 . . . .
. 7 4 . . 3 8 . 6
3 6 . 2 . 4 1 7 .
. . . . . . 4 8 .
8 . . 4 6 . . 1 7
. . 7 . 1 . . . 3
. 5 . . . . . 6 .
. . . . . 6 3 . 1
. 9 . 8 . . . 4 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 981675234274193856365284179516739482839462517427518693152347968748956321693821745 #1 Extreme (6022)
Hidden Single: r2c9=6
Hidden Single: r6c7=6
Hidden Single: r1c8=3
Hidden Single: r6c6=8
Hidden Single: r3c5=8
Hidden Single: r7c9=8
Hidden Single: r1c9=4
Locked Candidates Type 1 (Pointing): 3 in ... |
normal_sudoku_766 | ..5.1........9..3....7.....3.....6..5....412.92..7.354.635...8.2.4.3...6.....9... | 835216497672495831419783265341952678587364129926178354763541982294837516158629743 | Basic 9x9 Sudoku 766 | 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 . . . .
. . . . 9 . . 3 .
. . . 7 . . . . .
3 . . . . . 6 . .
5 . . . . 4 1 2 .
9 2 . . 7 . 3 5 4
. 6 3 5 . . . 8 .
2 . 4 . 3 . . . 6
. . . . . 9 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 835216497672495831419783265341952678587364129926178354763541982294837516158629743 #1 Hard (584)
Hidden Single: r6c9=4
Hidden Single: r4c2=4
Hidden Single: r5c4=3
Hidden Single: r9c9=3
Hidden Single: r3c3=9
Hidden Single: r8c2=9
Hidden Single: r5c9=9
Naked Single: r4c8=7
Full House: r4c9=8
... |
normal_sudoku_3421 | .4..3..12......3..3..1...845......9..2.8.41..71..69...........5..6.7.....3.4..8.. | 948537612162948357375126984584713296629854173713269548491682735856371429237495861 | Basic 9x9 Sudoku 3421 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . 4 . . 3 . . 1 2
. . . . . . 3 . .
3 . . 1 . . . 8 4
5 . . . . . . 9 .
. 2 . 8 . 4 1 . .
7 1 . . 6 9 . . .
. . . . . . . . 5
. . 6 . 7 . . . .
. 3 . 4 . . 8 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 948537612162948357375126984584713296629854173713269548491682735856371429237495861 #1 Extreme (18796) bf
Brute Force: r5c6=4
Naked Single: r5c5=5
Hidden Single: r2c5=4
Hidden Single: r7c5=8
Locked Candidates Type 1 (Pointing): 4 in b4 => r7c3<>4
Locked Candidates Type 1 (Pointing): 7 in b5 => r4c79<>7
... |
normal_sudoku_5143 | ....7...8.6.82.9.1..81.9.43..93.8.14.......9......2.3..4.2.......39.14..5........ | 914673528365824971278159643759368214432517896186492735847235169623981457591746382 | Basic 9x9 Sudoku 5143 | 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
. 6 . 8 2 . 9 . 1
. . 8 1 . 9 . 4 3
. . 9 3 . 8 . 1 4
. . . . . . . 9 .
. . . . . 2 . 3 .
. 4 . 2 . . . . .
. . 3 9 . 1 4 . .
5 . . . . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 914673528365824971278159643759368214432517896186492735847235169623981457591746382 #1 Hard (1470)
Hidden Single: r2c4=8
Hidden Single: r6c5=9
Hidden Single: r5c5=1
Hidden Single: r9c5=4
Hidden Single: r7c5=3
Hidden Single: r9c7=3
Hidden Single: r8c5=8
Hidden Single: r7c7=1
Hidden Single: r7c6=... |
normal_sudoku_1019 | 4.....7.1....1..2........3.3..957.1.....823.6.2.6.......8.24...9..73.....51.9.... | 493268751867315924215479638386957412574182396129643587638524179942731865751896243 | Basic 9x9 Sudoku 1019 | 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 . . . . . 7 . 1
. . . . 1 . . 2 .
. . . . . . . 3 .
3 . . 9 5 7 . 1 .
. . . . 8 2 3 . 6
. 2 . 6 . . . . .
. . 8 . 2 4 . . .
9 . . 7 3 . . . .
. 5 1 . 9 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 493268751867315924215479638386957412574182396129643587638524179942731865751896243 #1 Medium (454)
Naked Single: r4c6=7
Naked Single: r9c4=8
Naked Single: r1c5=6
Naked Single: r6c5=4
Full House: r3c5=7
Naked Single: r9c6=6
Naked Single: r5c4=1
Full House: r6c6=3
Naked Single: r7c4=5
Full Ho... |
normal_sudoku_1029 | .5.2...1....5....6..3.8.9...4..978.....1...7......2..5536..8..7798.2.....14.6.3.. | 459236718821579436673481952145697823982153674367842195536918247798324561214765389 | Basic 9x9 Sudoku 1029 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . 5 . 2 . . . 1 .
. . . 5 . . . . 6
. . 3 . 8 . 9 . .
. 4 . . 9 7 8 . .
. . . 1 . . . 7 .
. . . . . 2 . . 5
5 3 6 . . 8 . . 7
7 9 8 . 2 . . . .
. 1 4 . 6 . 3 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 459236718821579436673481952145697823982153674367842195536918247798324561214765389 #1 Easy (342)
Naked Single: r8c1=7
Full House: r9c1=2
Hidden Single: r3c8=5
Hidden Single: r4c3=5
Hidden Single: r6c4=8
Hidden Single: r5c5=5
Hidden Single: r8c7=5
Hidden Single: r9c4=7
Hidden Single: r9c6=5
... |
normal_sudoku_2522 | 25....86..........79......2.7..9..2.6.5148.933..2..154....75....1.......5.74.1.39 | 253914867846732915791856342174593628625148793389267154932675481418329576567481239 | Basic 9x9 Sudoku 2522 | 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 5 . . . . 8 6 .
. . . . . . . . .
7 9 . . . . . . 2
. 7 . . 9 . . 2 .
6 . 5 1 4 8 . 9 3
3 . . 2 . . 1 5 4
. . . . 7 5 . . .
. 1 . . . . . . .
5 . 7 4 . 1 . 3 9 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 253914867846732915791856342174593628625148793389267154932675481418329576567481239 #1 Easy (224)
Naked Single: r5c1=6
Naked Single: r4c7=6
Naked Single: r6c5=6
Naked Single: r5c2=2
Full House: r5c7=7
Full House: r4c9=8
Naked Single: r6c2=8
Naked Single: r4c6=3
Naked Single: r9c7=2
Naked Sin... |
normal_sudoku_5457 | .8.5...4.....7.1......9...5.489...5.35.86..9...6.....3..5.49.2..2..85..4...2..... | 683521947592476138417398265248937651351864792976152483135749826729685314864213579 | Basic 9x9 Sudoku 5457 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . 8 . 5 . . . 4 .
. . . . 7 . 1 . .
. . . . 9 . . . 5
. 4 8 9 . . . 5 .
3 5 . 8 6 . . 9 .
. . 6 . . . . . 3
. . 5 . 4 9 . 2 .
. 2 . . 8 5 . . 4
. . . 2 . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 683521947592476138417398265248937651351864792976152483135749826729685314864213579 #1 Extreme (25550) bf
Hidden Single: r5c2=5
Hidden Single: r6c5=5
Hidden Single: r9c7=5
Hidden Single: r2c1=5
Brute Force: r5c6=4
Hidden Single: r6c7=4
Hidden Single: r6c8=8
Locked Candidates Type 1 (Pointing): 1 i... |
normal_sudoku_2361 | .2.35..1...1..72..6..2.1..32..536..45...981..9......5.......9..1...7..4..4.12.5.. | 728354619431967285695281473217536894564798132983412756376845921152679348849123567 | Basic 9x9 Sudoku 2361 | 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 . . 1 .
. . 1 . . 7 2 . .
6 . . 2 . 1 . . 3
2 . . 5 3 6 . . 4
5 . . . 9 8 1 . .
9 . . . . . . 5 .
. . . . . . 9 . .
1 . . . 7 . . 4 .
. 4 . 1 2 . 5 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 728354619431967285695281473217536894564798132983412756376845921152679348849123567 #1 Medium (398)
Naked Single: r4c6=6
Hidden Single: r4c2=1
Hidden Single: r4c8=9
Hidden Single: r6c5=1
Hidden Single: r7c9=1
Hidden Single: r6c6=2
Hidden Single: r2c9=5
Hidden Single: r1c9=9
Naked Single: r1c6=4... |
normal_sudoku_2166 | .2..9...81..7.2...93..6.2.......4.27..92......5.8...6..7..1.582....86..9......1.. | 724395618168742395935168274381654927649271853257839461476913582512486739893527146 | Basic 9x9 Sudoku 2166 | 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 . . . 8
1 . . 7 . 2 . . .
9 3 . . 6 . 2 . .
. . . . . 4 . 2 7
. . 9 2 . . . . .
. 5 . 8 . . . 6 .
. 7 . . 1 . 5 8 2
. . . . 8 6 . . 9
. . . . . . 1 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 724395618168742395935168274381654927649271853257839461476913582512486739893527146 #1 Medium (530)
Hidden Single: r3c7=2
Hidden Single: r3c6=8
Hidden Single: r9c5=2
Hidden Single: r4c4=6
Hidden Single: r9c2=9
Hidden Single: r2c8=9
Hidden Single: r9c9=6
Hidden Single: r2c5=4
Hidden Single: r9c6... |
normal_sudoku_6339 | 4.5.1...9.6.......2.1..6..4.5..4...6....28.9...976.3........8....76...31.1..5...2 | 475213689968574213231986574853149726746328195129765348692431857587692431314857962 | Basic 9x9 Sudoku 6339 | 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 . 1 . . . 9
. 6 . . . . . . .
2 . 1 . . 6 . . 4
. 5 . . 4 . . . 6
. . . . 2 8 . 9 .
. . 9 7 6 . 3 . .
. . . . . . 8 . .
. . 7 6 . . . 3 1
. 1 . . 5 . . . 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 475213689968574213231986574853149726746328195129765348692431857587692431314857962 #1 Easy (260)
Naked Single: r6c5=6
Hidden Single: r2c9=3
Naked Single: r2c3=8
Hidden Single: r6c9=8
Naked Single: r6c1=1
Naked Single: r6c6=5
Hidden Single: r4c1=8
Hidden Single: r8c2=8
Naked Single: r8c5=9
N... |
normal_sudoku_2009 | ....8...3.2.7..6.....635.....24...974....72...7.....6...8....1..4.9..7..5.7..1... | 695284173823719645714635829182456397456397281379128564938572416241963758567841932 | Basic 9x9 Sudoku 2009 | 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
. 2 . 7 . . 6 . .
. . . 6 3 5 . . .
. . 2 4 . . . 9 7
4 . . . . 7 2 . .
. 7 . . . . . 6 .
. . 8 . . . . 1 .
. 4 . 9 . . 7 . .
5 . 7 . . 1 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 695284173823719645714635829182456397456397281379128564938572416241963758567841932 #1 Extreme (36612) bf
Locked Candidates Type 1 (Pointing): 2 in b2 => r1c8<>2
Brute Force: r5c6=7
Hidden Single: r7c5=7
Finned X-Wing: 4 c58 r29 fr1c8 fr3c8 => r2c9<>4
Brute Force: r5c5=9
Locked Candidates Type 1 (Pointi... |
normal_sudoku_2495 | ...5.48.35..........13...2.2..7.......9.317...7...9.3.........68479...1.3621...74 | 726514893534892167981376425213748659659231748478659231195427386847963512362185974 | Basic 9x9 Sudoku 2495 | 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 8 . 3
5 . . . . . . . .
. . 1 3 . . . 2 .
2 . . 7 . . . . .
. . 9 . 3 1 7 . .
. 7 . . . 9 . 3 .
. . . . . . . . 6
8 4 7 9 . . . 1 .
3 6 2 1 . . . 7 4 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 726514893534892167981376425213748659659231748478659231195427386847963512362185974 #1 Hard (532)
Naked Single: r8c1=8
Naked Single: r1c3=6
Naked Single: r7c3=5
Naked Single: r1c8=9
Naked Single: r1c1=7
Naked Single: r1c2=2
Full House: r1c5=1
Naked Single: r7c8=8
Hidden Single: r9c7=9
Hidden... |
normal_sudoku_5891 | ....4.1....31.....1...8..39..2.9...779.2......31..529.....2135...593..72......... | 987346125253179846164582739542893617796214583831765294479621358615938472328457961 | Basic 9x9 Sudoku 5891 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . . 4 . 1 . .
. . 3 1 . . . . .
1 . . . 8 . . 3 9
. . 2 . 9 . . . 7
7 9 . 2 . . . . .
. 3 1 . . 5 2 9 .
. . . . 2 1 3 5 .
. . 5 9 3 . . 7 2
. . . . . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 987346125253179846164582739542893617796214583831765294479621358615938472328457961 #1 Extreme (24954) bf
Hidden Single: r6c8=9
Hidden Single: r4c8=1
Hidden Single: r5c5=1
Hidden Single: r5c9=3
Hidden Single: r9c7=9
Hidden Single: r9c1=3
Hidden Single: r8c2=1
Hidden Single: r9c9=1
Hidden Single... |
normal_sudoku_2981 | ..82....6.2.5.63.7.....4...2.6..8...85..4..2..14.2....6..8.1...14......5..2.5.... | 578213496429586317361974258296138574853749621714625839635891742147362985982457163 | Basic 9x9 Sudoku 2981 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . 8 2 . . . . 6
. 2 . 5 . 6 3 . 7
. . . . . 4 . . .
2 . 6 . . 8 . . .
8 5 . . 4 . . 2 .
. 1 4 . 2 . . . .
6 . . 8 . 1 . . .
1 4 . . . . . . 5
. . 2 . 5 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 578213496429586317361974258296138574853749621714625839635891742147362985982457163 #1 Extreme (12956) bf
Hidden Single: r4c1=2
Hidden Single: r3c2=6
Hidden Single: r9c4=4
Hidden Single: r9c2=8
Hidden Single: r8c6=2
Hidden Single: r6c6=5
Hidden Single: r7c3=5
Hidden Single: r8c5=6
Brute Force: ... |
normal_sudoku_1876 | ..8.2...32..1...9......65..1...9..7..8.6.79....7..1..4......4.57.5..2.6..3....... | 568924713243175698971386542154893276382647951697251384826719435715432869439568127 | Basic 9x9 Sudoku 1876 | 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 . . 1 . . . 9 .
. . . . . 6 5 . .
1 . . . 9 . . 7 .
. 8 . 6 . 7 9 . .
. . 7 . . 1 . . 4
. . . . . . 4 . 5
7 . 5 . . 2 . 6 .
. 3 . . . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 568924713243175698971386542154893276382647951697251384826719435715432869439568127 #1 Extreme (39472) bf
Locked Candidates Type 1 (Pointing): 7 in b9 => r9c45<>7
Brute Force: r5c7=9
Finned Swordfish: 2 r357 c389 fr7c2 => r9c3<>2
Locked Candidates Type 1 (Pointing): 2 in b7 => r7c8<>2
Grouped Discontinuous... |
normal_sudoku_1138 | ......51.53..91...1685.7.9..9..7......7..3.26..5..8....53.....89.18.....7...65.3. | 479386512532491687168527493396172854847953126215648379653719248921834765784265931 | Basic 9x9 Sudoku 1138 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . . . . 5 1 .
5 3 . . 9 1 . . .
1 6 8 5 . 7 . 9 .
. 9 . . 7 . . . .
. . 7 . . 3 . 2 6
. . 5 . . 8 . . .
. 5 3 . . . . . 8
9 . 1 8 . . . . .
7 . . . 6 5 . 3 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 479386512532491687168527493396172854847953126215648379653719248921834765784265931 #1 Hard (858)
Hidden Single: r2c1=5
Hidden Single: r5c5=5
Hidden Single: r1c3=9
Hidden Single: r1c5=8
Hidden Single: r1c2=7
Hidden Single: r7c4=7
Hidden Single: r9c2=8
Hidden Single: r4c3=6
Hidden Single: r7c1=6... |
normal_sudoku_2990 | ...58.....3..1.7.49..7..6....9..8..7....4...35..2.3916.6.8.........9....4.7...1.8 | 746589231835612794912734685329168547671945823584273916263851479158497362497326158 | Basic 9x9 Sudoku 2990 | 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 8 . . . .
. 3 . . 1 . 7 . 4
9 . . 7 . . 6 . .
. . 9 . . 8 . . 7
. . . . 4 . . . 3
5 . . 2 . 3 9 1 6
. 6 . 8 . . . . .
. . . . 9 . . . .
4 . 7 . . . 1 . 8 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 746589231835612794912734685329168547671945823584273916263851479158497362497326158 #1 Medium (580)
Naked Single: r6c9=6
Naked Single: r6c5=7
Hidden Single: r3c5=3
Hidden Single: r4c1=3
Hidden Single: r9c2=9
Hidden Single: r8c4=4
Hidden Single: r5c7=8
Hidden Single: r9c4=3
Locked Candidates Typ... |
normal_sudoku_592 | ..5.8..32.29.7....6..2..5.......17.....43..9.1...9...3.4386...52..1....8...3..... | 715986432429573816638214579392651784576438291184792653943867125257149368861325947 | Basic 9x9 Sudoku 592 | 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 . 8 . . 3 2
. 2 9 . 7 . . . .
6 . . 2 . . 5 . .
. . . . . 1 7 . .
. . . 4 3 . . 9 .
1 . . . 9 . . . 3
. 4 3 8 6 . . . 5
2 . . 1 . . . . 8
. . . 3 . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 715986432429573816638214579392651784576438291184792653943867125257149368861325947 #1 Easy (390)
Hidden Single: r2c2=2
Hidden Single: r3c5=1
Hidden Single: r8c7=3
Hidden Single: r6c4=7
Hidden Single: r1c4=9
Hidden Single: r9c3=1
Hidden Single: r1c2=1
Hidden Single: r3c9=9
Hidden Single: r1c1=7... |
normal_sudoku_5178 | ...6....1.4....38.7.98.....9......6...8.7..35..53..1....25...1..9..3.2..4...62... | 823645971541729386769813542934251768218976435675384129382597614196438257457162893 | Basic 9x9 Sudoku 5178 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . 6 . . . . 1
. 4 . . . . 3 8 .
7 . 9 8 . . . . .
9 . . . . . . 6 .
. . 8 . 7 . . 3 5
. . 5 3 . . 1 . .
. . 2 5 . . . 1 .
. 9 . . 3 . 2 . .
4 . . . 6 2 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 823645971541729386769813542934251768218976435675384129382597614196438257457162893 #1 Extreme (13882) bf
Forcing Net Contradiction in r1 => r3c6<>5
r3c6=5 (r2c6<>5 r2c1=5 r1c1<>5) r3c6<>3 r3c2=3 (r1c1<>3) r1c3<>3 r1c3=8 r1c1<>8 r1c1=2
r3c6=5 (r2c6<>5 r2c1=5 r1c2<>5) r3c6<>3 r3c2=3 (r1c2<>3) r1c3<>3 r1c3=8 r1c2<>8... |
normal_sudoku_4882 | 61......2..82...4.2....79.85..3724......86.....24....3....5..3...39..8..1..7..... | 619548372758239641234617958591372486347186529862495713926854137473921865185763294 | Basic 9x9 Sudoku 4882 | 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 . . . . . . 2
. . 8 2 . . . 4 .
2 . . . . 7 9 . 8
5 . . 3 7 2 4 . .
. . . . 8 6 . . .
. . 2 4 . . . . 3
. . . . 5 . . 3 .
. . 3 9 . . 8 . .
1 . . 7 . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 619548372758239641234617958591372486347186529862495713926854137473921865185763294 #1 Extreme (22790) bf
Hidden Single: r4c6=2
Locked Candidates Type 1 (Pointing): 9 in b5 => r6c128<>9
Grouped Discontinuous Nice Loop: 4 r9c2 -4- r78c1 =4= r5c1 =3= r5c2 -3- r3c2 =3= r3c5 -3- r9c5 =3= r9c6 =8= r9c2 => r9c2<>4
... |
normal_sudoku_688 | 8..6..4...2...4.7...4.....5....1...7.7.4.23..6..8...2..3.7...9...1.9....9....3..6 | 893675412526184973714329685352916847178452369649837521435761298261598734987243156 | Basic 9x9 Sudoku 688 | 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 . . 4 . .
. 2 . . . 4 . 7 .
. . 4 . . . . . 5
. . . . 1 . . . 7
. 7 . 4 . 2 3 . .
6 . . 8 . . . 2 .
. 3 . 7 . . . 9 .
. . 1 . 9 . . . .
9 . . . . 3 . . 6 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 893675412526184973714329685352916847178452369649837521435761298261598734987243156 #1 Extreme (20850) bf
Brute Force: r5c4=4
Brute Force: r5c5=5
Naked Single: r5c1=1
Hidden Single: r5c8=6
Hidden Single: r7c5=6
Hidden Single: r4c6=6
Hidden Single: r2c3=6
Hidden Single: r8c2=6
Hidden Single: r9c... |
normal_sudoku_2433 | ..1.5.........76..4561..378...74......4..85379.5......6.....8.2.9.......2..3..79. | 731856429829437651456192378382745916164928537975613284613579842597284163248361795 | Basic 9x9 Sudoku 2433 | 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 . . . .
. . . . . 7 6 . .
4 5 6 1 . . 3 7 8
. . . 7 4 . . . .
. . 4 . . 8 5 3 7
9 . 5 . . . . . .
6 . . . . . 8 . 2
. 9 . . . . . . .
2 . . 3 . . 7 9 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 731856429829437651456192378382745916164928537975613284613579842597284163248361795 #1 Easy (336)
Naked Single: r3c1=4
Naked Single: r5c1=1
Naked Single: r9c3=8
Hidden Single: r4c6=5
Hidden Single: r6c2=7
Hidden Single: r2c3=9
Hidden Single: r8c1=5
Hidden Single: r8c9=3
Naked Single: r8c3=7
... |
normal_sudoku_2900 | .........1..9.648...37.592..9...25.......3...36......17....8..3..5......9...6..4. | 659824317127936485483715926891672534574183269362459871746298153215347698938561742 | Basic 9x9 Sudoku 2900 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . . . . . . .
1 . . 9 . 6 4 8 .
. . 3 7 . 5 9 2 .
. 9 . . . 2 5 . .
. . . . . 3 . . .
3 6 . . . . . . 1
7 . . . . 8 . . 3
. . 5 . . . . . .
9 . . . 6 . . 4 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 659824317127936485483715926891672534574183269362459871746298153215347698938561742 #1 Easy (442)
Naked Single: r2c6=6
Naked Single: r3c9=6
Hidden Single: r3c5=1
Naked Single: r1c6=4
Hidden Single: r2c5=3
Hidden Single: r4c8=3
Hidden Single: r1c7=3
Hidden Single: r1c3=9
Hidden Single: r4c4=6
... |
normal_sudoku_1206 | .785....15.1..26...6..1..5..4..3.5.....67...4..7....3..14.9...57.....9..2..85..4. | 978563421531482679462917358149238567823675194657149832314796285785324916296851743 | Basic 9x9 Sudoku 1206 | 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 5 . . . . 1
5 . 1 . . 2 6 . .
. 6 . . 1 . . 5 .
. 4 . . 3 . 5 . .
. . . 6 7 . . . 4
. . 7 . . . . 3 .
. 1 4 . 9 . . . 5
7 . . . . . 9 . .
2 . . 8 5 . . 4 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 978563421531482679462917358149238567823675194657149832314796285785324916296851743 #1 Unfair (932)
Hidden Single: r2c3=1
Hidden Single: r3c3=2
Locked Candidates Type 2 (Claiming): 4 in r2 => r1c56,r3c46<>4
Naked Single: r1c5=6
Naked Pair: 3,9 in r29c2 => r58c2<>3, r56c2<>9
Finned X-Wing: 2 c59 r68 fr4c... |
normal_sudoku_5132 | 7.2.3..6......6..8....9..5.9..6..13.....18..9..5..3..6...36..1.3..5..89..5....... | 712835964594176328836294751948657132623418579175923486487369215361542897259781643 | Basic 9x9 Sudoku 5132 | 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 . 2 . 3 . . 6 .
. . . . . 6 . . 8
. . . . 9 . . 5 .
9 . . 6 . . 1 3 .
. . . . 1 8 . . 9
. . 5 . . 3 . . 6
. . . 3 6 . . 1 .
3 . . 5 . . 8 9 .
. 5 . . . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 712835964594176328836294751948657132623418579175923486487369215361542897259781643 #1 Extreme (15370) bf
Hidden Single: r6c6=3
Hidden Single: r5c7=5
Hidden Single: r6c8=8
Hidden Single: r9c5=8
Hidden Single: r9c7=6
Hidden Single: r1c6=5
Hidden Single: r2c1=5
Hidden Single: r6c4=9
Hidden Single... |
normal_sudoku_839 | .6......1..3..25..8..7...3..3..1..8.4..5.8.....73....6.5..9......82..4..3....5.9. | 762953841193482567845761932539617284416528379287349156651894723978236415324175698 | Basic 9x9 Sudoku 839 | 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
. . 3 . . 2 5 . .
8 . . 7 . . . 3 .
. 3 . . 1 . . 8 .
4 . . 5 . 8 . . .
. . 7 3 . . . . 6
. 5 . . 9 . . . .
. . 8 2 . . 4 . .
3 . . . . 5 . 9 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 762953841193482567845761932539617284416528379287349156651894723978236415324175698 #1 Extreme (20550) bf
Hidden Pair: 4,5 in r4c9,r6c8 => r4c9,r6c8<>2, r4c9<>7, r4c9<>9, r6c8<>1
Brute Force: r5c6=8
Hidden Single: r6c2=8
Brute Force: r5c5=2
Naked Single: r6c5=4
Naked Single: r6c6=9
Naked Single: r6c8... |
normal_sudoku_1592 | ..56.8..7...7.5.193....2..415.....8...8.71......8..6...........54.3.......6.5794. | 915648327462735819387912564153496782628571493794823651879264135541389276236157948 | Basic 9x9 Sudoku 1592 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . 5 6 . 8 . . 7
. . . 7 . 5 . 1 9
3 . . . . 2 . . 4
1 5 . . . . . 8 .
. . 8 . 7 1 . . .
. . . 8 . . 6 . .
. . . . . . . . .
5 4 . 3 . . . . .
. . 6 . 5 7 9 4 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 915648327462735819387912564153496782628571493794823651879264135541389276236157948 #1 Easy (380)
Naked Single: r9c6=7
Hidden Single: r3c8=6
Hidden Single: r6c9=1
Hidden Single: r5c4=5
Hidden Single: r3c7=5
Hidden Single: r6c8=5
Hidden Single: r7c9=5
Hidden Single: r3c2=8
Hidden Single: r2c7=8
... |
normal_sudoku_5057 | 9...8..1...83..4...5...7..8..28567...8.4....5....3.......2..6..1......9..7...3.84 | 927684513618325479453197268392856741786412935541739826839241657164578392275963184 | Basic 9x9 Sudoku 5057 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 9 . . . 8 . . 1 .
. . 8 3 . . 4 . .
. 5 . . . 7 . . 8
. . 2 8 5 6 7 . .
. 8 . 4 . . . . 5
. . . . 3 . . . .
. . . 2 . . 6 . .
1 . . . . . . 9 .
. 7 . . . 3 . 8 4 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 927684513618325479453197268392856741786412935541739826839241657164578392275963184 #1 Extreme (11212)
Hidden Single: r4c4=8
Hidden Single: r6c7=8
Hidden Single: r7c1=8
Hidden Single: r8c6=8
Naked Pair: 3,4 in r4c18 => r4c29<>3, r4c2<>4
Hidden Pair: 5,7 in r27c8 => r2c8<>2, r2c8<>6, r7c8<>3
Forcing C... |
normal_sudoku_931 | 4...3.....6..5....725......9..1....581....3.2.56...4...9.3815.....4...3....52...1 | 489632157163759824725814693942163785817945362356278419294381576571496238638527941 | Basic 9x9 Sudoku 931 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 4 . . . 3 . . . .
. 6 . . 5 . . . .
7 2 5 . . . . . .
9 . . 1 . . . . 5
8 1 . . . . 3 . 2
. 5 6 . . . 4 . .
. 9 . 3 8 1 5 . .
. . . 4 . . . 3 .
. . . 5 2 . . . 1 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 489632157163759824725814693942163785817945362356278419294381576571496238638527941 #1 Unfair (1740)
Naked Single: r5c1=8
Naked Single: r1c2=8
Naked Single: r8c2=7
Hidden Single: r3c5=1
Hidden Single: r1c8=5
Hidden Single: r3c9=3
Hidden Single: r5c6=5
Hidden Single: r8c1=5
Hidden Single: r6c8=1... |
normal_sudoku_611 | 6.235...4..5.1..6..43..7..5.....1..6.6....95...7...1...7..26.8....58....4.6...... | 612358794795412368843697215254971836168243957937865142579126483321584679486739521 | Basic 9x9 Sudoku 611 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 6 . 2 3 5 . . . 4
. . 5 . 1 . . 6 .
. 4 3 . . 7 . . 5
. . . . . 1 . . 6
. 6 . . . . 9 5 .
. . 7 . . . 1 . .
. 7 . . 2 6 . 8 .
. . . 5 8 . . . .
4 . 6 . . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 612358794795412368843697215254971836168243957937865142579126483321584679486739521 #1 Unfair (1590)
Hidden Single: r1c1=6
Hidden Single: r6c6=5
Hidden Single: r8c7=6
Hidden Single: r9c2=8
Naked Single: r2c2=9
Naked Single: r1c2=1
Naked Single: r3c1=8
Full House: r2c1=7
Naked Single: r3c7=2
... |
normal_sudoku_1868 | .4..7.1....52...7.1..9....851..8.....3...528.6.....5.....8.643...4.2..17......8.5 | 942378156385261974176954328519482763437615289628739541751896432894523617263147895 | Basic 9x9 Sudoku 1868 | 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 . . 7 . 1 . .
. . 5 2 . . . 7 .
1 . . 9 . . . . 8
5 1 . . 8 . . . .
. 3 . . . 5 2 8 .
6 . . . . . 5 . .
. . . 8 . 6 4 3 .
. . 4 . 2 . . 1 7
. . . . . . 8 . 5 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 942378156385261974176954328519482763437615289628739541751896432894523617263147895 #1 Extreme (4302)
Hidden Single: r4c1=5
Hidden Single: r4c7=7
Hidden Single: r5c1=4
Locked Candidates Type 1 (Pointing): 3 in b6 => r12c9<>3
Locked Candidates Type 1 (Pointing): 7 in b8 => r9c123<>7
Hidden Single: r7c1=7... |
normal_sudoku_5717 | 82.43.7...94.....3.....98.49......7..372...4.24...83.9...91....4..86............2 | 825436791694187523713529864981643275537291648246758319372915486459862137168374952 | Basic 9x9 Sudoku 5717 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 8 2 . 4 3 . 7 . .
. 9 4 . . . . . 3
. . . . . 9 8 . 4
9 . . . . . . 7 .
. 3 7 2 . . . 4 .
2 4 . . . 8 3 . 9
. . . 9 1 . . . .
4 . . 8 6 . . . .
. . . . . . . . 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 825436791694187523713529864981643275537291648246758319372915486459862137168374952 #1 Extreme (12462) bf
Hidden Single: r3c9=4
Hidden Single: r5c9=8
Hidden Single: r1c8=9
Hidden Single: r5c5=9
Hidden Single: r2c5=8
Hidden Single: r4c7=2
Hidden Single: r3c5=2
Hidden Single: r2c8=2
Brute Force: ... |
normal_sudoku_1009 | ..49.25.1..3....8..6...34....7..42...4.2..1..2...5......8.1...9..68..35.3....67.. | 784962531523741986169583472897134265645278193231659847478315629916827354352496718 | Basic 9x9 Sudoku 1009 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . 4 9 . 2 5 . 1
. . 3 . . . . 8 .
. 6 . . . 3 4 . .
. . 7 . . 4 2 . .
. 4 . 2 . . 1 . .
2 . . . 5 . . . .
. . 8 . 1 . . . 9
. . 6 8 . . 3 5 .
3 . . . . 6 7 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 784962531523741986169583472897134265645278193231659847478315629916827354352496718 #1 Easy (366)
Naked Single: r8c7=3
Naked Single: r7c7=6
Naked Single: r2c7=9
Full House: r6c7=8
Hidden Single: r1c8=3
Hidden Single: r9c8=1
Hidden Single: r9c9=8
Hidden Single: r7c4=3
Hidden Single: r5c6=8
Hi... |
normal_sudoku_2010 | ..49...7.5...3....6...1.9...5..482.6.6.....1..921...87..54..7...4..8..2..3..7..54 | 314962578529837641678514932153748296867293415492156387985421763746385129231679854 | Basic 9x9 Sudoku 2010 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . 4 9 . . . 7 .
5 . . . 3 . . . .
6 . . . 1 . 9 . .
. 5 . . 4 8 2 . 6
. 6 . . . . . 1 .
. 9 2 1 . . . 8 7
. . 5 4 . . 7 . .
. 4 . . 8 . . 2 .
. 3 . . 7 . . 5 4 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 314962578529837641678514932153748296867293415492156387985421763746385129231679854 #1 Hard (1028)
Naked Single: r6c2=9
Hidden Single: r2c3=9
Hidden Single: r4c8=9
Locked Candidates Type 1 (Pointing): 4 in b6 => r2c7<>4
Locked Candidates Type 2 (Claiming): 7 in c2 => r3c3<>7
Hidden Rectangle: 3/4 in r5c... |
normal_sudoku_1440 | .5..9.7....7....8.2..6..4.......3..46..12.....9.5........4...13..1..854.5...1...8 | 354891726167245389289637451815973264673124895492586137728459613931768542546312978 | Basic 9x9 Sudoku 1440 | 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 . .
. . 7 . . . . 8 .
2 . . 6 . . 4 . .
. . . . . 3 . . 4
6 . . 1 2 . . . .
. 9 . 5 . . . . .
. . . 4 . . . 1 3
. . 1 . . 8 5 4 .
5 . . . 1 . . . 8 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 354891726167245389289637451815973264673124895492586137728459613931768542546312978 #1 Extreme (24822) bf
Finned X-Wing: 4 c15 r26 fr1c1 => r2c2<>4
Brute Force: r5c4=1
Brute Force: r5c6=4
Hidden Single: r2c5=4
Hidden Single: r9c2=4
Hidden Single: r4c4=9
Hidden Single: r1c4=8
Locked Candidates Type... |
normal_sudoku_6488 | 96.....275....6....3..4....14.6....93..1.9..5..9.3.....9.4.1.......659..6..3...5. | 964583127587216394231947568148652739326179845759834216895421673413765982672398451 | Basic 9x9 Sudoku 6488 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 9 6 . . . . . 2 7
5 . . . . 6 . . .
. 3 . . 4 . . . .
1 4 . 6 . . . . 9
3 . . 1 . 9 . . 5
. . 9 . 3 . . . .
. 9 . 4 . 1 . . .
. . . . 6 5 9 . .
6 . . 3 . . . 5 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 964583127587216394231947568148652739326179845759834216895421673413765982672398451 #1 Extreme (13852) bf
Hidden Single: r6c3=9
Hidden Single: r6c6=4
Hidden Single: r8c1=4
Hidden Single: r1c6=3
Hidden Single: r9c5=9
Hidden Single: r7c3=5
Hidden Single: r6c2=5
Hidden Single: r5c3=6
Hidden Single... |
normal_sudoku_945 | ..6.5..4......18....4936.5.7........9....4.....5.6..3....6.5.2.....2.3.4..2..3... | 196258743253471896874936251768392415931584672425167938389645127517829364642713589 | Basic 9x9 Sudoku 945 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . 6 . 5 . . 4 .
. . . . . 1 8 . .
. . 4 9 3 6 . 5 .
7 . . . . . . . .
9 . . . . 4 . . .
. . 5 . 6 . . 3 .
. . . 6 . 5 . 2 .
. . . . 2 . 3 . 4
. . 2 . . 3 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 196258743253471896874936251768392415931584672425167938389645127517829364642713589 #1 Extreme (37456) bf
Hidden Single: r3c6=6
Locked Candidates Type 1 (Pointing): 8 in b2 => r1c12<>8
Locked Candidates Type 1 (Pointing): 6 in b4 => r89c2<>6
Locked Candidates Type 1 (Pointing): 5 in b9 => r9c12<>5
Hidden P... |
normal_sudoku_2479 | ...2...9.....4.62.6249.7.........7...3.75...27..19....8...6..7.9....1..6.....8..4 | 587216493391845627624937158452683719139754862768192345845369271973421586216578934 | Basic 9x9 Sudoku 2479 | 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.
| . . . 2 . . . 9 .
. . . . 4 . 6 2 .
6 2 4 9 . 7 . . .
. . . . . . 7 . .
. 3 . 7 5 . . . 2
7 . . 1 9 . . . .
8 . . . 6 . . 7 .
9 . . . . 1 . . 6
. . . . . 8 . . 4 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 587216493391845627624937158452683719139754862768192345845369271973421586216578934 #1 Easy (384)
Hidden Single: r2c8=2
Hidden Single: r1c6=6
Naked Single: r5c6=4
Naked Single: r5c1=1
Hidden Single: r4c4=6
Hidden Single: r7c6=9
Hidden Single: r1c7=4
Hidden Single: r9c7=9
Naked Single: r5c7=8
... |
normal_sudoku_3234 | ..6.385..43..1...8.8.9...3...3...6..1...5.....2.8...7..9.3..8..3....4.....7....23 | 716438592439512768582967134943721685178653249625849371294375816361284957857196423 | Basic 9x9 Sudoku 3234 | 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 8 5 . .
4 3 . . 1 . . . 8
. 8 . 9 . . . 3 .
. . 3 . . . 6 . .
1 . . . 5 . . . .
. 2 . 8 . . . 7 .
. 9 . 3 . . 8 . .
3 . . . . 4 . . .
. . 7 . . . . 2 3 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 716438592439512768582967134943721685178653249625849371294375816361284957857196423 #1 Extreme (16836) bf
Hidden Single: r2c2=3
Forcing Net Contradiction in r8c7 => r8c9<>5
r8c9=5 (r8c2<>5) (r7c8<>5) r8c8<>5 r4c8=5 (r4c2<>5 r9c2=5 r9c1<>5) r4c8<>8 r4c1=8 r9c1<>8 r9c1=6 r8c2<>6 r8c2=1 r1c2<>1 r1c2=7 (r1c1<>7) r3c1... |
normal_sudoku_4757 | 3.67...2.5.7...4...42.3.6..63...1...25..7.9.......8..3...5.3.727..86254.........6 | 386749125517286439942135687638921754251374968479658213164593872793862541825417396 | Basic 9x9 Sudoku 4757 | 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 . 6 7 . . . 2 .
5 . 7 . . . 4 . .
. 4 2 . 3 . 6 . .
6 3 . . . 1 . . .
2 5 . . 7 . 9 . .
. . . . . 8 . . 3
. . . 5 . 3 . 7 2
7 . . 8 6 2 5 4 .
. . . . . . . . 6 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 386749125517286439942135687638921754251374968479658213164593872793862541825417396 #1 Medium (494)
Hidden Single: r1c1=3
Hidden Single: r2c8=3
Hidden Single: r5c4=3
Hidden Single: r3c9=7
Hidden Single: r6c2=7
Hidden Single: r9c6=7
Hidden Single: r7c2=6
Hidden Single: r9c2=2
Hidden Single: r9c3... |
normal_sudoku_2051 | 8...56..9.3............36.8.72...8.69467.85..31......2...9...2.1...4.7.....1..... | 827456319635891247491273658572314896946728531318569472763985124159642783284137965 | Basic 9x9 Sudoku 2051 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 8 . . . 5 6 . . 9
. 3 . . . . . . .
. . . . . 3 6 . 8
. 7 2 . . . 8 . 6
9 4 6 7 . 8 5 . .
3 1 . . . . . . 2
. . . 9 . . . 2 .
1 . . . 4 . 7 . .
. . . 1 . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 827456319635891247491273658572314896946728531318569472763985124159642783284137965 #1 Easy (370)
Naked Single: r5c2=4
Naked Single: r1c2=2
Naked Single: r4c1=5
Full House: r6c3=8
Naked Single: r1c4=4
Naked Single: r3c4=2
Naked Single: r4c4=3
Naked Single: r2c4=8
Hidden Single: r2c1=6
Hidden... |
normal_sudoku_641 | ..3...7.2...326...4.2....6.....7..23.2.8.4...5.4.9.18..4.7.......7..9..56.5...9.. | 163548792978326541452917368896175423721834659534692187249751836387469215615283974 | Basic 9x9 Sudoku 641 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . 3 . . . 7 . 2
. . . 3 2 6 . . .
4 . 2 . . . . 6 .
. . . . 7 . . 2 3
. 2 . 8 . 4 . . .
5 . 4 . 9 . 1 8 .
. 4 . 7 . . . . .
. . 7 . . 9 . . 5
6 . 5 . . . 9 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 163548792978326541452917368896175423721834659534692187249751836387469215615283974 #1 Extreme (5712)
Hidden Single: r1c9=2
Hidden Single: r3c7=3
Hidden Single: r4c7=4
Hidden Single: r3c6=7
Hidden Single: r1c2=6
Locked Candidates Type 1 (Pointing): 4 in b2 => r1c8<>4
Locked Candidates Type 1 (Pointin... |
normal_sudoku_2655 | 43...2.5.26.1.9.78..9.5.....5.9.....1.....8343.......9.......8.....7.4.3..13..7.5 | 438762951265149378719853642654938217197625834382417569573294186826571493941386725 | Basic 9x9 Sudoku 2655 | 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 . . . 2 . 5 .
2 6 . 1 . 9 . 7 8
. . 9 . 5 . . . .
. 5 . 9 . . . . .
1 . . . . . 8 3 4
3 . . . . . . . 9
. . . . . . . 8 .
. . . . 7 . 4 . 3
. . 1 3 . . 7 . 5 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 438762951265149378719853642654938217197625834382417569573294186826571493941386725 #1 Extreme (3256)
Naked Single: r2c2=6
Naked Single: r2c3=5
Naked Single: r2c7=3
Full House: r2c5=4
Hidden Single: r5c2=9
Hidden Single: r1c7=9
Hidden Single: r6c7=5
Hidden Single: r3c8=4
Hidden Single: r3c2=1
... |
normal_sudoku_5561 | 1.96..53...45..2...7..3...4....8....41....3....62..9.....7...52..7..5..9....6.7.. | 189624537634571298572839164923186475418957326756243981341798652267315849895462713 | Basic 9x9 Sudoku 5561 | puzzles4_forum_hardest_1905 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 1 . 9 6 . . 5 3 .
. . 4 5 . . 2 . .
. 7 . . 3 . . . 4
. . . . 8 . . . .
4 1 . . . . 3 . .
. . 6 2 . . 9 . .
. . . 7 . . . 5 2
. . 7 . . 5 . . 9
. . . . 6 . 7 . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 189624537634571298572839164923186475418957326756243981341798652267315849895462713 #1 Extreme (10790) bf
Locked Candidates Type 1 (Pointing): 9 in b4 => r4c46<>9
Brute Force: r5c7=3
Naked Single: r5c4=9
Hidden Single: r9c9=3
Skyscraper: 3 in r7c3,r8c4 (connected by r4c34) => r7c6,r8c12<>3
Hidden Single... |
normal_sudoku_6930 | .4.5..9.........63..9.6...7..82......5.6.8.2.9...4.7....5.....17...5.3...1.9.6... | 643572918572189463189463257468217539357698124921345786835724691796851342214936875 | Basic 9x9 Sudoku 6930 | 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 . . 9 . .
. . . . . . . 6 3
. . 9 . 6 . . . 7
. . 8 2 . . . . .
. 5 . 6 . 8 . 2 .
9 . . . 4 . 7 . .
. . 5 . . . . . 1
7 . . . 5 . 3 . .
. 1 . 9 . 6 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 643572918572189463189463257468217539357698124921345786835724691796851342214936875 #1 Extreme (22292) bf
Brute Force: r5c4=6
2-String Kite: 7 in r2c2,r5c5 (connected by r4c2,r5c3) => r2c5<>7
Multi Colors 1: 7 (r2c2,r5c3) / (r4c2,r5c5), (r2c4) / (r7c4) => r79c5<>7
Hidden Single: r9c8=7
Forcing Chain Contra... |
normal_sudoku_1557 | 5.91.246..83647..1...9.........7.......2..6..7.2...893.1.....8...431.......8...19 | 579132468283647951461985732396478125158293647742561893915726384824319576637854219 | Basic 9x9 Sudoku 1557 | 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 . 2 4 6 .
. 8 3 6 4 7 . . 1
. . . 9 . . . . .
. . . . 7 . . . .
. . . 2 . . 6 . .
7 . 2 . . . 8 9 3
. 1 . . . . . 8 .
. . 4 3 1 . . . .
. . . 8 . . . 1 9 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 579132468283647951461985732396478125158293647742561893915726384824319576637854219 #1 Hard (812)
Naked Single: r1c1=5
Naked Single: r1c2=7
Naked Single: r2c1=2
Naked Single: r1c9=8
Full House: r1c5=3
Naked Single: r2c8=5
Full House: r2c7=9
Hidden Single: r6c6=1
Hidden Single: r8c1=8
Hidden ... |
normal_sudoku_3274 | ..715..26.4..3...5......3...5.4..1..1....3...9...715...3..17.....594...77.9...... | 387154926641239785592786341856492173174563892923871564438617259215948637769325418 | Basic 9x9 Sudoku 3274 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . 7 1 5 . . 2 6
. 4 . . 3 . . . 5
. . . . . . 3 . .
. 5 . 4 . . 1 . .
1 . . . . 3 . . .
9 . . . 7 1 5 . .
. 3 . . 1 7 . . .
. . 5 9 4 . . . 7
7 . 9 . . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 387154926641239785592786341856492173174563892923871564438617259215948637769325418 #1 Extreme (12402) bf
Hidden Single: r6c6=1
Hidden Single: r5c4=5
Hidden Single: r1c1=3
Hidden Single: r3c1=5
Hidden Single: r9c6=5
Hidden Single: r9c4=3
Hidden Single: r8c8=3
Hidden Single: r4c8=7
Hidden Single... |
normal_sudoku_423 | ....8435...823.7.63....6.......5.....1..2......78..2.5.8.9....7..9.72....6...89.2 | 926784351458231796371596824842159673513627489697843215284965137139472568765318942 | Basic 9x9 Sudoku 423 | 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 4 3 5 .
. . 8 2 3 . 7 . 6
3 . . . . 6 . . .
. . . . 5 . . . .
. 1 . . 2 . . . .
. . 7 8 . . 2 . 5
. 8 . 9 . . . . 7
. . 9 . 7 2 . . .
. 6 . . . 8 9 . 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 926784351458231796371596824842159673513627489697843215284965137139472568765318942 #1 Extreme (31576) bf
Hidden Single: r5c5=2
Hidden Single: r9c1=7
Hidden Single: r3c8=2
Locked Candidates Type 1 (Pointing): 7 in b2 => r45c4<>7
Finned Swordfish: 5 r359 c134 fr3c2 => r2c1<>5
Discontinuous Nice Loop: 9 r... |
normal_sudoku_2071 | ...125..38.1...57.3.9......936..4................1..67..2.73.9.64.............62. | 467125983821936574359847216936784152175362849284519367512673498648291735793458621 | Basic 9x9 Sudoku 2071 | puzzles1_unbiased | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . 1 2 5 . . 3
8 . 1 . . . 5 7 .
3 . 9 . . . . . .
9 3 6 . . 4 . . .
. . . . . . . . .
. . . . 1 . . 6 7
. . 2 . 7 3 . 9 .
6 4 . . . . . . .
. . . . . . 6 2 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 467125983821936574359847216936784152175362849284519367512673498648291735793458621 #1 Easy (318)
Hidden Single: r3c1=3
Hidden Single: r4c4=7
Hidden Single: r1c7=9
Hidden Single: r9c2=9
Hidden Single: r1c2=6
Naked Single: r2c2=2
Hidden Single: r7c4=6
Hidden Single: r8c7=7
Hidden Single: r9c3=3
... |
normal_sudoku_2718 | ...3.68...3.4.75...8.5.16..6....829.8..9...7.3......6..972..............5...1...2 | 715396824236487519984521637641738295852964173379152468197245386428673951563819742 | Basic 9x9 Sudoku 2718 | 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 8 . .
. 3 . 4 . 7 5 . .
. 8 . 5 . 1 6 . .
6 . . . . 8 2 9 .
8 . . 9 . . . 7 .
3 . . . . . . 6 .
. 9 7 2 . . . . .
. . . . . . . . .
5 . . . 1 . . . 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 715396824236487519984521637641738295852964173379152468197245386428673951563819742 #1 Hard (1074)
Naked Single: r1c4=3
Hidden Single: r2c5=8
Hidden Single: r2c3=6
Hidden Single: r5c5=6
Hidden Single: r6c9=8
Hidden Single: r6c3=9
Hidden Single: r7c9=6
Hidden Single: r7c8=8
Hidden Single: r8c8=5... |
normal_sudoku_2285 | ...8..276...7.2..1.2.......28..9.........5.4.4.5..78.985.9.....9.4....2..725.4... | 341859276598762431627341985286493157719685342435217869853926714964178523172534698 | Basic 9x9 Sudoku 2285 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . . . 8 . . 2 7 6
. . . 7 . 2 . . 1
. 2 . . . . . . .
2 8 . . 9 . . . .
. . . . . 5 . 4 .
4 . 5 . . 7 8 . 9
8 5 . 9 . . . . .
9 . 4 . . . . 2 .
. 7 2 5 . 4 . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 341859276598762431627341985286493157719685342435217869853926714964178523172534698 #1 Extreme (21768) bf
Hidden Single: r1c7=2
Hidden Single: r5c5=8
Hidden Single: r5c9=2
Hidden Single: r7c5=2
Hidden Single: r4c4=4
Hidden Single: r8c6=8
Hidden Single: r6c4=2
Hidden Single: r8c5=7
Naked Triple:... |
normal_sudoku_5033 | 1.39...6..9..6.8...86.53.1.3..8....685....19..6..95......5.1..........7...56..92. | 143987562597162843286453719379814256852736194461295387924571638618329475735648921 | Basic 9x9 Sudoku 5033 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| 1 . 3 9 . . . 6 .
. 9 . . 6 . 8 . .
. 8 6 . 5 3 . 1 .
3 . . 8 . . . . 6
8 5 . . . . 1 9 .
. 6 . . 9 5 . . .
. . . 5 . 1 . . .
. . . . . . . 7 .
. . 5 6 . . 9 2 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 143987562597162843286453719379814256852736194461295387924571638618329475735648921 #1 Extreme (13998) bf
Hidden Single: r3c2=8
Hidden Single: r4c3=9
Hidden Single: r2c4=1
Hidden Single: r4c5=1
Hidden Single: r2c1=5
Hidden Single: r5c6=6
Hidden Single: r3c9=9
Hidden Single: r8c6=9
Hidden Single... |
normal_sudoku_3832 | 4.69....1....4..........2....451.92..7.692...5.9..4..6.3.4.......5....8.9.1.6...2 | 456923871217845369398176245684517923173692458529384716832451697765239184941768532 | Basic 9x9 Sudoku 3832 | 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.
| 4 . 6 9 . . . . 1
. . . . 4 . . . .
. . . . . . 2 . .
. . 4 5 1 . 9 2 .
. 7 . 6 9 2 . . .
5 . 9 . . 4 . . 6
. 3 . 4 . . . . .
. . 5 . . . . 8 .
9 . 1 . 6 . . . 2 | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 456923871217845369398176245684517923173692458529384716832451697765239184941768532 #1 Extreme (11656) bf
Brute Force: r5c6=2
Hidden Single: r6c2=2
Hidden Single: r1c5=2
Hidden Single: r5c1=1
Hidden Single: r8c4=2
Locked Candidates Type 1 (Pointing): 1 in b8 => r23c6<>1
Naked Triple: 4,6,8 in r489c2 ... |
normal_sudoku_4298 | ...........82..9.......5.78.6..1..933198..4....29..8......4.6....6.2...99..6...8. | 295487136178263945643195278864512793319876452752934861581349627436728519927651384 | Basic 9x9 Sudoku 4298 | 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 . . 9 . .
. . . . . 5 . 7 8
. 6 . . 1 . . 9 3
3 1 9 8 . . 4 . .
. . 2 9 . . 8 . .
. . . . 4 . 6 . .
. . 6 . 2 . . . 9
9 . . 6 . . . 8 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 295487136178263945643195278864512793319876452752934861581349627436728519927651384 #1 Extreme (32442) bf
Hidden Single: r5c3=9
Hidden Single: r4c1=8
Hidden Single: r7c6=9
Hidden Single: r1c5=8
Hidden Single: r7c2=8
Hidden Single: r8c6=8
Hidden Single: r1c2=9
Hidden Single: r3c5=9
Hidden Single... |
normal_sudoku_3766 | ....9......78..6.58....6.2.9...6.48.......7.9.1.9..........2..4.3..49...4..6..29. | 563297148297814635841356927925761483386425719714938562679182354132549876458673291 | Basic 9x9 Sudoku 3766 | 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 8 . . 6 . 5
8 . . . . 6 . 2 .
9 . . . 6 . 4 8 .
. . . . . . 7 . 9
. 1 . 9 . . . . .
. . . . . 2 . . 4
. 3 . . 4 9 . . .
4 . . 6 . . 2 9 . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 563297148297814635841356927925761483386425719714938562679182354132549876458673291 #1 Extreme (14154) bf
Hidden Single: r6c4=9
Hidden Single: r2c2=9
Hidden Single: r3c7=9
Hidden Single: r7c3=9
Brute Force: r5c5=2
Hidden Single: r2c1=2
Hidden Single: r1c4=2
Hidden Single: r4c2=2
Hidden Single: ... |
normal_sudoku_200 | .8..29...4.58..92...2.5....52..84...8....6.4....2..813.479..18.9.1.4...7....3.... | 786429351435817926192653478523184769819376542674295813347962185961548237258731694 | Basic 9x9 Sudoku 200 | 01_file1 | Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
| . 8 . . 2 9 . . .
4 . 5 8 . . 9 2 .
. . 2 . 5 . . . .
5 2 . . 8 4 . . .
8 . . . . 6 . 4 .
. . . 2 . . 8 1 3
. 4 7 9 . . 1 8 .
9 . 1 . 4 . . . 7
. . . . 3 . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 786429351435817926192653478523184769819376542674295813347962185961548237258731694 #1 Easy (264)
Hidden Single: r1c5=2
Naked Single: r7c5=6
Naked Single: r8c4=5
Naked Single: r7c6=2
Naked Single: r7c1=3
Full House: r7c9=5
Naked Single: r8c6=8
Naked Single: r8c2=6
Naked Single: r8c8=3
Full H... |
normal_sudoku_2611 | ..1.7..62.9.4.23................47..9.25.7.3..7.23..45.2.9.358.5...2....8.9...... | 481375962795462318263891457358614729942587136176239845627943581514728693839156274 | Basic 9x9 Sudoku 2611 | 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 . . 6 2
. 9 . 4 . 2 3 . .
. . . . . . . . .
. . . . . 4 7 . .
9 . 2 5 . 7 . 3 .
. 7 . 2 3 . . 4 5
. 2 . 9 . 3 5 8 .
5 . . . 2 . . . .
8 . 9 . . . . . . | 9 | 9 | None | Complete the sudoku board based on the rules and visual elements. | sudoku | sudoku_annotation | hard | 481375962795462318263891457358614729942587136176239845627943581514728693839156274 #1 Extreme (18084) bf
X-Wing: 9 r16 c67 => r3c67,r8c7<>9
Grouped Discontinuous Nice Loop: 4 r1c2 -4- r13c1 =4= r7c1 -4- r7c5 =4= r9c5 =5= r9c6 -5- r1c6 =5= r1c2 => r1c2<>4
Forcing Net Contradiction in b3 => r1c1=4
r1c1<>4 (r1c1... |
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