task_name
string
initial_board
string
solution
string
title
string
rules
string
visual_elements
string
rows
int64
cols
int64
initial_observation
string
description
string
task_type
string
data_source
string
difficulty
string
hint
string
solver_difficulty
string
sudoku_normal_extremely_hard_50
7...1.6...4.5...9...8..9..358....1..9...5...8..1....456..4..3...7...3.2...2.9...7
793218654146537892258649713587924136964351278321786945615472389479863521832195467
sudoku_normal_extremely_hard_50
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
7 . . . 1 . 6 . . . 4 . 5 . . . 9 . . . 8 . . 9 . . 3 5 8 . . . . 1 . . 9 . . . 5 . . . 8 . . 1 . . . . 4 5 6 . . 4 . . 3 . . . 7 . . . 3 . 2 . . . 2 . 9 . . . 7
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
793218654146537892258649713587924136964351278321786945615472389479863521832195467 #1 Medium (446) Locked Candidates Type 1 (Pointing): 4 in b4 => r8c3<>4 Locked Pair: 5,9 in r78c3 => r1c3,r79c2<>5, r1c3,r7c2<>9 Naked Single: r1c3=3 Naked Single: r7c2=1 Naked Single: r2c3=6 Naked Single: r7c9=9 Nake...
Medium
sudoku_normal_extremely_hard_51
...2..7.3.4..7....9.....5.25..8...3...1.2.9...8...4..63.9.....7....5..1.6.8..3...
165289743842375691973461582596817234431526978287934156359142867724658319618793425
sudoku_normal_extremely_hard_51
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . . 2 . . 7 . 3 . 4 . . 7 . . . . 9 . . . . . 5 . 2 5 . . 8 . . . 3 . . . 1 . 2 . 9 . . . 8 . . . 4 . . 6 3 . 9 . . . . . 7 . . . . 5 . . 1 . 6 . 8 . . 3 . . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
165289743842375691973461582596817234431526978287934156359142867724658319618793425 #1 Medium (414) Hidden Single: r4c2=9 Hidden Single: r8c7=3 Locked Triple: 2,4,7 in r8c123 => r8c49<>4, r8c46,r9c2<>7, r79c2,r8c6<>2 Hidden Single: r7c6=2 Hidden Single: r9c4=7 Hidden Single: r8c2=2 Locked Candidates ...
Medium
sudoku_normal_extremely_hard_52
.4...8...5..1..9....7.3..1..9......7..2.4.8..1......6..8..9.4....3..7..2...5...3.
941658723536172984827439615698215347372946851154783269285391476413867592769524138
sudoku_normal_extremely_hard_52
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. 4 . . . 8 . . . 5 . . 1 . . 9 . . . . 7 . 3 . . 1 . . 9 . . . . . . 7 . . 2 . 4 . 8 . . 1 . . . . . . 6 . . 8 . . 9 . 4 . . . . 3 . . 7 . . 2 . . . 5 . . . 3 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
941658723536172984827439615698215347372946851154783269285391476413867592769524138 #1 Easy (262) Hidden Single: r1c3=1 Hidden Single: r9c3=9 Hidden Single: r8c8=9 Naked Single: r5c8=5 Naked Single: r7c8=7 Naked Single: r1c8=2 Naked Single: r4c8=4 Full House: r2c8=8 Naked Single: r2c3=6 Nake...
Easy
sudoku_normal_extremely_hard_53
5..1....6.6....9....7..4.2...37....8.8..3..1.9....64...1.2..8....5....7.8....9..4
542193786368572941197684325623741598784935612951826437419257863235468179876319254
sudoku_normal_extremely_hard_53
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
5 . . 1 . . . . 6 . 6 . . . . 9 . . . . 7 . . 4 . 2 . . . 3 7 . . . . 8 . 8 . . 3 . . 1 . 9 . . . . 6 4 . . . 1 . 2 . . 8 . . . . 5 . . . . 7 . 8 . . . . 9 . . 4
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
542193786368572941197684325623741598784935612951826437419257863235468179876319254 #1 Medium (644) Locked Candidates Type 2 (Claiming): 8 in r3 => r1c56,r2c456<>8 Hidden Single: r8c6=8 Hidden Single: r4c6=1 Hidden Single: r6c3=1 Naked Triple: 2,5,8 in r5c6,r6c45 => r4c5<>2, r4c5,r5c4<>5 Naked Triple: 1...
Medium
sudoku_normal_extremely_hard_54
..5.3.6.....7...4..8...6..13..8...2...7...9...9...1..41..5...8..5...2.....9.4.7..
275134698961785342483296571346859127817423956592671834134567289758912463629348715
sudoku_normal_extremely_hard_54
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . 5 . 3 . 6 . . . . . 7 . . . 4 . . 8 . . . 6 . . 1 3 . . 8 . . . 2 . . . 7 . . . 9 . . . 9 . . . 1 . . 4 1 . . 5 . . . 8 . . 5 . . . 2 . . . . . 9 . 4 . 7 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
275134698961785342483296571346859127817423956592671834134567289758912463629348715 #1 Medium (388) Hidden Pair: 1,8 in r28c5 => r2c5<>2, r2c5<>5, r28c5<>9, r8c5<>6, r8c5<>7 Hidden Single: r8c1=7 Hidden Single: r3c8=7 Naked Single: r1c8=9 Hidden Single: r1c2=7 Hidden Single: r4c9=7 Hidden Single: r6c...
Medium
sudoku_normal_extremely_hard_55
..6.21..5...5..8..4......3..5...2..7..9.4.1..6..8...9..1......6..2..7...8..25.4..
386421975721539864495678231158392647239746158674815392513984726942167583867253419
sudoku_normal_extremely_hard_55
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . 6 . 2 1 . . 5 . . . 5 . . 8 . . 4 . . . . . . 3 . . 5 . . . 2 . . 7 . . 9 . 4 . 1 . . 6 . . 8 . . . 9 . . 1 . . . . . . 6 . . 2 . . 7 . . . 8 . . 2 5 . 4 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
386421975721539864495678231158392647239746158674815392513984726942167583867253419 #1 Easy (314) Hidden Single: r3c3=5 Hidden Single: r1c2=8 Hidden Single: r3c9=1 Hidden Single: r4c3=8 Hidden Single: r9c8=1 Hidden Single: r4c8=4 Naked Single: r1c8=7 Naked Single: r1c7=9 Naked Single: r1c1=3 ...
Easy
sudoku_normal_extremely_hard_56
...8.4..5.3..9..1......74..9.4...3....7.6.2....5...1.6..24......8..7..9.7..1.3...
271834965436592817598617423964721358817365249325948176652489731183276594749153682
sudoku_normal_extremely_hard_56
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . . 8 . 4 . . 5 . 3 . . 9 . . 1 . . . . . . 7 4 . . 9 . 4 . . . 3 . . . . 7 . 6 . 2 . . . . 5 . . . 1 . 6 . . 2 4 . . . . . . 8 . . 7 . . 9 . 7 . . 1 . 3 . . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
271834965436592817598617423964721358817365249325948176652489731183276594749153682 #1 Easy (294) Naked Single: r5c2=1 Naked Single: r6c2=2 Naked Single: r4c2=6 Hidden Single: r2c1=4 Hidden Single: r6c5=4 Hidden Single: r9c2=4 Hidden Single: r5c9=9 Hidden Single: r1c7=9 Naked Single: r1c2=7 ...
Easy
sudoku_normal_extremely_hard_57
...2......4...9..71.9.4.6...7.6....8..5.7.9..3....1.5...2.1.5.66..4...3......3...
783256149546189327129347685974635218215874963368921754432718596657492831891563472
sudoku_normal_extremely_hard_57
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . . 2 . . . . . . 4 . . . 9 . . 7 1 . 9 . 4 . 6 . . . 7 . 6 . . . . 8 . . 5 . 7 . 9 . . 3 . . . . 1 . 5 . . . 2 . 1 . 5 . 6 6 . . 4 . . . 3 . . . . . . 3 . . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
783256149546189327129347685974635218215874963368921754432718596657492831891563472 #1 Medium (384) Hidden Single: r6c7=7 Hidden Single: r2c4=1 Hidden Single: r5c8=6 Hidden Single: r7c2=3 Hidden Single: r9c5=6 Hidden Single: r1c6=6 Hidden Single: r2c3=6 Hidden Single: r6c2=6 Hidden Single: r1c3...
Medium
sudoku_normal_extremely_hard_58
..4....2..9...2..56...3.7..2..7...9...8.1.6...3...4..8..1.6...43..9...8..7....1..
754896321193472865682135749216758493548319672937624518821567934365941287479283156
sudoku_normal_extremely_hard_58
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . 4 . . . . 2 . . 9 . . . 2 . . 5 6 . . . 3 . 7 . . 2 . . 7 . . . 9 . . . 8 . 1 . 6 . . . 3 . . . 4 . . 8 . . 1 . 6 . . . 4 3 . . 9 . . . 8 . . 7 . . . . 1 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
754896321193472865682135749216758493548319672937624518821567934365941287479283156 #1 Easy (444) Hidden Single: r2c3=3 Hidden Single: r8c6=1 Hidden Single: r6c3=7 Hidden Single: r6c4=6 Hidden Single: r9c3=9 Hidden Single: r2c8=6 Hidden Single: r1c6=6 Hidden Single: r7c7=9 Hidden Single: r9c9=6...
Easy
sudoku_normal_extremely_hard_59
..5..8..1.2.1..3..78..3..9...46....9.3.....1.9....72...1..6..85..2..3.7.5..4..6..
345298761629174358781536492174625839236849517958317246413762985862953174597481623
sudoku_normal_extremely_hard_59
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . 5 . . 8 . . 1 . 2 . 1 . . 3 . . 7 8 . . 3 . . 9 . . . 4 6 . . . . 9 . 3 . . . . . 1 . 9 . . . . 7 2 . . . 1 . . 6 . . 8 5 . . 2 . . 3 . 7 . 5 . . 4 . . 6 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
345298761629174358781536492174625839236849517958317246413762985862953174597481623 #1 Easy (212) Naked Single: r8c9=4 Naked Single: r7c7=9 Naked Single: r7c6=2 Naked Single: r8c7=1 Naked Single: r7c4=7 Naked Single: r7c3=3 Full House: r7c1=4 Naked Single: r2c1=6 Naked Single: r1c1=3 Naked S...
Easy
sudoku_normal_extremely_hard_60
9..6....2..8..3....1..7.4....7....3.5..8.1..9.8....1....3.6..7....9..5..8....2..6
975684312428153697316279485147596238532841769689327154293465871764918523851732946
sudoku_normal_extremely_hard_60
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
9 . . 6 . . . . 2 . . 8 . . 3 . . . . 1 . . 7 . 4 . . . . 7 . . . . 3 . 5 . . 8 . 1 . . 9 . 8 . . . . 1 . . . . 3 . 6 . . 7 . . . . 9 . . 5 . . 8 . . . . 2 . . 6
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
975684312428153697316279485147596238532841769689327154293465871764918523851732946 #1 Easy (528) Hidden Single: r4c1=1 Hidden Single: r5c7=7 Hidden Single: r1c2=7 Hidden Single: r2c9=7 Hidden Single: r8c1=7 Hidden Single: r9c4=7 Hidden Single: r1c7=3 Naked Single: r9c7=9 Naked Single: r2c7=6 ...
Easy
sudoku_normal_extremely_hard_61
....1...29..7..3....1..8.4..5.8..2..7...9...5..2..6.8..4.3..7....6..1..98...6....
387614592964725318521938647659843271738192465412576983145389726276451839893267154
sudoku_normal_extremely_hard_61
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . . . 1 . . . 2 9 . . 7 . . 3 . . . . 1 . . 8 . 4 . . 5 . 8 . . 2 . . 7 . . . 9 . . . 5 . . 2 . . 6 . 8 . . 4 . 3 . . 7 . . . . 6 . . 1 . . 9 8 . . . 6 . . . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
387614592964725318521938647659843271738192465412576983145389726276451839893267154 #1 Medium (494) Hidden Pair: 7,9 in r14c8 => r1c8<>5, r14c8<>6, r4c8<>1, r4c8<>3 Hidden Pair: 1,6 in r4c19 => r4c19<>3, r4c19<>4, r4c9<>7 Naked Triple: 1,6,8 in r247c9 => r3c9<>6, r69c9<>1 Naked Single: r3c9=7 Naked Single:...
Medium
sudoku_normal_extremely_hard_62
8..2...6...3..5..1.4.3..7..9.1....8.....6.....3....2.5..6..4.7.2..1..9...8...9..4
819247563763985421542316798921453687475862319638791245196534872254178936387629154
sudoku_normal_extremely_hard_62
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
8 . . 2 . . . 6 . . . 3 . . 5 . . 1 . 4 . 3 . . 7 . . 9 . 1 . . . . 8 . . . . . 6 . . . . . 3 . . . . 2 . 5 . . 6 . . 4 . 7 . 2 . . 1 . . 9 . . . 8 . . . 9 . . 4
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
819247563763985421542316798921453687475862319638791245196534872254178936387629154 #1 Easy (314) Hidden Single: r6c1=6 Naked Single: r2c1=7 Hidden Single: r7c2=9 Hidden Single: r8c3=4 Hidden Single: r3c6=6 Hidden Single: r2c2=6 Hidden Single: r5c1=4 Hidden Single: r1c2=1 Naked Single: r1c6=7 ...
Easy
sudoku_normal_extremely_hard_63
...7....423...5.7...5.8....4..6..1...8.....2...2..9..6....1.7...5.4...619....3...
869721534231945678745386912493652187586174329172839456624518793358497261917263845
sudoku_normal_extremely_hard_63
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . . 7 . . . . 4 2 3 . . . 5 . 7 . . . 5 . 8 . . . . 4 . . 6 . . 1 . . . 8 . . . . . 2 . . . 2 . . 9 . . 6 . . . . 1 . 7 . . . 5 . 4 . . . 6 1 9 . . . . 3 . . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
869721534231945678745386912493652187586174329172839456624518793358497261917263845 #1 Medium (458) Hidden Triple: 1,6,7 in r9c235 => r9c25<>2, r9c23<>4, r9c3<>8, r9c5<>5 Hidden Single: r7c2=2 Hidden Single: r3c2=4 Hidden Single: r7c3=4 Hidden Single: r2c5=4 Hidden Single: r5c6=4 Hidden Single: r3c1=...
Medium
sudoku_normal_extremely_hard_64
...5....31....46....2....9.6..3.2.4...8...1...9.8.1..5.5....2....79....83....7...
769528413135794682842136597671352849528479136493861725954683271217945368386217954
sudoku_normal_extremely_hard_64
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . . 5 . . . . 3 1 . . . . 4 6 . . . . 2 . . . . 9 . 6 . . 3 . 2 . 4 . . . 8 . . . 1 . . . 9 . 8 . 1 . . 5 . 5 . . . . 2 . . . . 7 9 . . . . 8 3 . . . . 7 . . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
769528413135794682842136597671352849528479136493861725954683271217945368386217954 #1 Medium (508) Hidden Single: r4c7=8 Hidden Single: r9c7=9 Naked Pair: 2,7 in r2c49 => r2c258<>7, r2c58<>2 Hidden Pair: 1,2 in r1c58 => r1c5<>6, r1c58<>7, r1c58<>8, r1c5<>9 Hidden Single: r2c8=8 Naked Single: r2c2=3 ...
Medium
sudoku_normal_extremely_hard_65
6...9..2..5...4.73..1...5.....7...5.2...3...9.4...1.....6...1..47.3...9..8..5...6
634597821852164973791283564318749652267835419549621387926478135475316298183952746
sudoku_normal_extremely_hard_65
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
6 . . . 9 . . 2 . . 5 . . . 4 . 7 3 . . 1 . . . 5 . . . . . 7 . . . 5 . 2 . . . 3 . . . 9 . 4 . . . 1 . . . . . 6 . . . 1 . . 4 7 . 3 . . . 9 . . 8 . . 5 . . . 6
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
634597821852164973791283564318749652267835419549621387926478135475316298183952746 #1 Easy (254) Naked Single: r1c2=3 Hidden Single: r1c9=1 Hidden Single: r5c8=1 Naked Single: r5c2=6 Hidden Single: r1c3=4 Naked Single: r1c7=8 Naked Single: r1c4=5 Full House: r1c6=7 Naked Single: r3c9=4 Nake...
Easy
sudoku_normal_extremely_hard_66
..4.8...5.1.9..8..2......6..4.1..9..6.......4..5..7.3..2......8..7..2.1.3...6.5..
964783125513926847278514369742138956631259784895647231126375498457892613389461572
sudoku_normal_extremely_hard_66
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . 4 . 8 . . . 5 . 1 . 9 . . 8 . . 2 . . . . . . 6 . . 4 . 1 . . 9 . . 6 . . . . . . . 4 . . 5 . . 7 . 3 . . 2 . . . . . . 8 . . 7 . . 2 . 1 . 3 . . . 6 . 5 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
964783125513926847278514369742138956631259784895647231126375498457892613389461572 #1 Medium (338) Naked Pair: 8,9 in r69c2 => r1358c2<>9, r358c2<>8 Hidden Single: r3c3=8 Hidden Single: r3c9=9 Hidden Single: r1c1=9 Hidden Single: r6c9=1 Naked Single: r6c1=8 Naked Single: r4c1=7 Naked Single: r6c2...
Medium
sudoku_normal_extremely_hard_67
..69...73.5...4..64...628...732.8..5..1.4.2..6..3.518...418...23..5...1.21...63..
826951473157834926439762851973218645581647239642395187794183562368529714215476398
sudoku_normal_extremely_hard_67
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . 6 9 . . . 7 3 . 5 . . . 4 . . 6 4 . . . 6 2 8 . . . 7 3 2 . 8 . . 5 . . 1 . 4 . 2 . . 6 . . 3 . 5 1 8 . . . 4 1 8 . . . 2 3 . . 5 . . . 1 . 2 1 . . . 6 3 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
826951473157834926439762851973218645581647239642395187794183562368529714215476398 #1 Easy (184) Naked Single: r4c1=9 Naked Single: r1c6=1 Naked Single: r2c7=9 Naked Single: r3c4=7 Naked Single: r4c5=1 Naked Single: r5c2=8 Naked Single: r6c3=2 Naked Single: r1c1=8 Naked Single: r1c5=5 Naked...
Easy
sudoku_normal_extremely_hard_68
.2..9.6....4..1..97..2...5.2..8..1......3......3..5..4.5...6..71..3..8....6.8..9.
825493671634571289719268453267849135541732968983615724458926317192357846376184592
sudoku_normal_extremely_hard_68
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. 2 . . 9 . 6 . . . . 4 . . 1 . . 9 7 . . 2 . . . 5 . 2 . . 8 . . 1 . . . . . . 3 . . . . . . 3 . . 5 . . 4 . 5 . . . 6 . . 7 1 . . 3 . . 8 . . . . 6 . 8 . . 9 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
825493671634571289719268453267849135541732968983615724458926317192357846376184592 #1 Medium (444) Hidden Pair: 3,8 in r13c6 => r13c6<>4, r1c6<>7 Hidden Pair: 4,7 in r1c48 => r1c4<>5, r1c8<>1, r1c8<>3, r1c8<>8 Hidden Single: r7c8=1 Hidden Single: r6c5=1 Hidden Single: r9c4=1 Hidden Single: r5c6=2 Hi...
Medium
sudoku_normal_extremely_hard_69
..84...3..5..2..6.3...7..8...7.....4...5.6...1.....9...4..3...7.2..9..1..6...28..
278461539954823761316975482637289154492516378185347926541638297823794615769152843
sudoku_normal_extremely_hard_69
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . 8 4 . . . 3 . . 5 . . 2 . . 6 . 3 . . . 7 . . 8 . . . 7 . . . . . 4 . . . 5 . 6 . . . 1 . . . . . 9 . . . 4 . . 3 . . . 7 . 2 . . 9 . . 1 . . 6 . . . 2 8 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
278461539954823761316975482637289154492516378185347926541638297823794615769152843 #1 Easy (328) Hidden Single: r9c8=4 Hidden Single: r1c5=6 Hidden Single: r1c2=7 Hidden Single: r8c6=4 Hidden Single: r7c8=9 Hidden Single: r4c1=6 Hidden Single: r3c3=6 Hidden Single: r9c5=5 Naked Single: r9c9=3 ...
Easy
sudoku_normal_extremely_hard_70
..3.9.4...5.8...1.6....2..7..2....3.1...8...6.9....5..4..1....2.7...6.8...9.5.3..
823791465957864213614532897782645139145983726396217548438179652571326984269458371
sudoku_normal_extremely_hard_70
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . 3 . 9 . 4 . . . 5 . 8 . . . 1 . 6 . . . . 2 . . 7 . . 2 . . . . 3 . 1 . . . 8 . . . 6 . 9 . . . . 5 . . 4 . . 1 . . . . 2 . 7 . . . 6 . 8 . . . 9 . 5 . 3 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
823791465957864213614532897782645139145983726396217548438179652571326984269458371 #1 Easy (314) Hidden Single: r2c1=9 Naked Single: r2c9=3 Hidden Single: r2c7=2 Hidden Single: r2c5=6 Hidden Single: r7c7=6 Hidden Single: r1c8=6 Hidden Single: r6c3=6 Hidden Single: r9c2=6 Hidden Single: r4c4=6 ...
Easy
sudoku_normal_extremely_hard_71
...3.8.9.1.......2..5.1.4..8....7.3...2...7...1.9....4..1.5.8..4.......7.9.6.3...
247368195139745682685219473854127936962534718713986524371452869426891357598673241
sudoku_normal_extremely_hard_71
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . . 3 . 8 . 9 . 1 . . . . . . . 2 . . 5 . 1 . 4 . . 8 . . . . 7 . 3 . . . 2 . . . 7 . . . 1 . 9 . . . . 4 . . 1 . 5 . 8 . . 4 . . . . . . . 7 . 9 . 6 . 3 . . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
247368195139745682685219473854127936962534718713986524371452869426891357598673241 #1 Medium (718) Locked Candidates Type 1 (Pointing): 5 in b2 => r2c78<>5 Locked Candidates Type 1 (Pointing): 1 in b8 => r8c78<>1 Hidden Pair: 1,5 in r1c79 => r1c79<>6 Naked Pair: 1,5 in r19c9 => r45c9<>1, r45c9<>5 Hidden P...
Medium
sudoku_normal_extremely_hard_72
..1.9...59..8..1....2....3.7..9..2...4..2..7...5..1..4.2....3....8..4..76...5.8..
361492785954873162872516439736945218149628573285731694427189356518364927693257841
sudoku_normal_extremely_hard_72
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . 1 . 9 . . . 5 9 . . 8 . . 1 . . . . 2 . . . . 3 . 7 . . 9 . . 2 . . . 4 . . 2 . . 7 . . . 5 . . 1 . . 4 . 2 . . . . 3 . . . . 8 . . 4 . . 7 6 . . . 5 . 8 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
361492785954873162872516439736945218149628573285731694427189356518364927693257841 #1 Medium (494) Hidden Single: r6c1=2 Hidden Single: r4c5=4 Locked Candidates Type 1 (Pointing): 4 in b9 => r12c8<>4 Hidden Single: r2c3=4 Hidden Single: r7c1=4 Hidden Single: r9c8=4 Hidden Single: r7c8=5 Hidden Si...
Medium
sudoku_normal_extremely_hard_73
6...8.2....54.26.....1...5..9...8...8...4...3...3...7..4...9.....26.35....3.7...9
631985247785432691429167358396758412857241963214396875148529736972613584563874129
sudoku_normal_extremely_hard_73
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
6 . . . 8 . 2 . . . . 5 4 . 2 6 . . . . . 1 . . . 5 . . 9 . . . 8 . . . 8 . . . 4 . . . 3 . . . 3 . . . 7 . . 4 . . . 9 . . . . . 2 6 . 3 5 . . . . 3 . 7 . . . 9
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
631985247785432691429167358396758412857241963214396875148529736972613584563874129 #1 Medium (754) Naked Single: r8c5=1 Hidden Single: r9c6=4 Hidden Single: r4c1=3 Hidden Single: r8c1=9 Naked Triple: 1,5,7 in r279c1 => r3c1<>7, r6c1<>1, r6c1<>5 Locked Candidates Type 1 (Pointing): 5 in b4 => r9c2<>5 ...
Medium
sudoku_normal_extremely_hard_74
9..8...3......1..4..5.6.7...8......9..7.1.8..4......6...8.3.1..6..9......2...4..8
914827536762351984835469712186542379297613845453798261548236197671985423329174658
sudoku_normal_extremely_hard_74
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
9 . . 8 . . . 3 . . . . . . 1 . . 4 . . 5 . 6 . 7 . . . 8 . . . . . . 9 . . 7 . 1 . 8 . . 4 . . . . . . 6 . . . 8 . 3 . 1 . . 6 . . 9 . . . . . . 2 . . . 4 . . 8
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
914827536762351984835469712186542379297613845453798261548236197671985423329174658 #1 Easy (412) Hidden Single: r9c4=1 Hidden Single: r9c7=6 Hidden Single: r1c9=6 Hidden Single: r2c7=9 Hidden Single: r6c5=9 Hidden Single: r3c6=9 Hidden Single: r5c2=9 Hidden Single: r9c3=9 Hidden Single: r6c6=8...
Easy
sudoku_normal_extremely_hard_75
.5...2..84..1..9....7....3..2...8..1..3.4.8..5..6...7..1....5....5..3..66..7...9.
156932748432187965897456132924378651763541829581629374319264587275893416648715293
sudoku_normal_extremely_hard_75
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. 5 . . . 2 . . 8 4 . . 1 . . 9 . . . . 7 . . . . 3 . . 2 . . . 8 . . 1 . . 3 . 4 . 8 . . 5 . . 6 . . . 7 . . 1 . . . . 5 . . . . 5 . . 3 . . 6 6 . . 7 . . . 9 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
156932748432187965897456132924378651763541829581629374319264587275893416648715293 #1 Medium (624) Hidden Pair: 3,7 in r7c19 => r7c19<>2, r7c1<>8, r7c1<>9, r7c9<>4 Hidden Pair: 2,8 in r38c1 => r3c1<>1, r38c1<>9, r8c1<>7 Hidden Single: r3c7=1 Hidden Single: r8c8=1 Hidden Single: r7c8=8 Hidden Pair: 1,5 ...
Medium
sudoku_normal_extremely_hard_76
7.9..2......1..7..3.6.8..1..3.4.9..8..7...4..5..6.1.9..9..6.1.4..1..4......5..6.9
719342856258196743346785912132479568967853421584621397895267134671934285423518679
sudoku_normal_extremely_hard_76
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
7 . 9 . . 2 . . . . . . 1 . . 7 . . 3 . 6 . 8 . . 1 . . 3 . 4 . 9 . . 8 . . 7 . . . 4 . . 5 . . 6 . 1 . 9 . . 9 . . 6 . 1 . 4 . . 1 . . 4 . . . . . . 5 . . 6 . 9
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
719342856258196743346785912132479568967853421584621397895267134671934285423518679 #1 Easy (332) Naked Single: r4c3=2 Naked Single: r1c4=3 Naked Single: r4c7=5 Naked Single: r1c7=8 Naked Single: r4c5=7 Naked Single: r4c8=6 Full House: r4c1=1 Hidden Single: r1c2=1 Hidden Single: r5c1=9 Hidde...
Easy
sudoku_normal_extremely_hard_77
..3..4.5.2..6....8.9..5.6..7.4....6....9.2....1....5.3..1.7..8.4....1..2.7.4..9..
863294157245617398197358624784135269536942871912786543321579486459861732678423915
sudoku_normal_extremely_hard_77
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . 3 . . 4 . 5 . 2 . . 6 . . . . 8 . 9 . . 5 . 6 . . 7 . 4 . . . . 6 . . . . 9 . 2 . . . . 1 . . . . 5 . 3 . . 1 . 7 . . 8 . 4 . . . . 1 . . 2 . 7 . 4 . . 9 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
863294157245617398197358624784135269536942871912786543321579486459861732678423915 #1 Easy (410) Hidden Single: r2c2=4 Hidden Single: r4c9=9 Hidden Single: r2c3=5 Hidden Single: r1c5=9 Hidden Single: r2c8=9 Hidden Single: r3c3=7 Hidden Single: r7c6=9 Hidden Single: r8c3=9 Hidden Single: r9c5=2...
Easy
sudoku_normal_extremely_hard_78
.7.4....3..3.8.2..5....1.6..9.2.......4...8.......9.5..6.9....4..2.1.7..4....6.1.
679452183143687295528391467896275341254163879317849652761938524982514736435726918
sudoku_normal_extremely_hard_78
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. 7 . 4 . . . . 3 . . 3 . 8 . 2 . . 5 . . . . 1 . 6 . . 9 . 2 . . . . . . . 4 . . . 8 . . . . . . . 9 . 5 . . 6 . 9 . . . . 4 . . 2 . 1 . 7 . . 4 . . . . 6 . 1 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
679452183143687295528391467896275341254163879317849652761938524982514736435726918 #1 Hard (558) Hidden Single: r8c6=4 Hidden Single: r8c9=6 Hidden Pair: 1,5 in r1c7,r2c9 => r1c7,r2c9<>9, r2c9<>7 X-Wing: 9 r28 c18 => r1c18,r5c8<>9 Naked Single: r1c8=8 Hidden Single: r5c9=9 Naked Single: r3c9=7 Na...
Hard
sudoku_normal_extremely_hard_79
42......6..93....5....12.9...3....1...8.2.7...5....3...9.63....2....96..1......48
421795836879364125365812497743986512918523764652471389594638271287149653136257948
sudoku_normal_extremely_hard_79
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
4 2 . . . . . . 6 . . 9 3 . . . . 5 . . . . 1 2 . 9 . . . 3 . . . . 1 . . . 8 . 2 . 7 . . . 5 . . . . 3 . . . 9 . 6 3 . . . . 2 . . . . 9 6 . . 1 . . . . . . 4 8
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
421795836879364125365812497743986512918523764652471389594638271287149653136257948 #1 Easy (334) Hidden Single: r1c8=3 Hidden Single: r5c6=3 Hidden Single: r6c3=2 Hidden Single: r9c4=2 Hidden Single: r3c1=3 Hidden Single: r9c2=3 Hidden Single: r9c7=9 Hidden Single: r8c9=3 Hidden Single: r1c3=1...
Easy
sudoku_normal_extremely_hard_80
.1..6..7...5..28..2..1.....5..6..3...8..7..9...3..5..4.....4..9..78..2...9..3..1.
914368572765492831238157946579641328486273195123985764351724689647819253892536417
sudoku_normal_extremely_hard_80
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. 1 . . 6 . . 7 . . . 5 . . 2 8 . . 2 . . 1 . . . . . 5 . . 6 . . 3 . . . 8 . . 7 . . 9 . . . 3 . . 5 . . 4 . . . . . 4 . . 9 . . 7 8 . . 2 . . . 9 . . 3 . . 1 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
914368572765492831238157946579641328486273195123985764351724689647819253892536417 #1 Hard (664) Hidden Single: r1c9=2 Hidden Single: r2c9=1 Naked Triple: 3,5,6 in r358c9 => r9c9<>5, r9c9<>6 X-Wing: 2 r59 c34 => r47c3,r67c4<>2 Naked Single: r6c4=9 Hidden Single: r4c3=9 Locked Candidates Type 2 (Clai...
Hard
sudoku_normal_extremely_hard_81
.5..7...19..8..3...6...4....8....6..5..3.1..2..4....5....4...2...1..9..73...6..8.
458973261912856374763214598289745613576391842134628759895437126621589437347162985
sudoku_normal_extremely_hard_81
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. 5 . . 7 . . . 1 9 . . 8 . . 3 . . . 6 . . . 4 . . . . 8 . . . . 6 . . 5 . . 3 . 1 . . 2 . . 4 . . . . 5 . . . . 4 . . . 2 . . . 1 . . 9 . . 7 3 . . . 6 . . 8 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
458973261912856374763214598289745613576391842134628759895437126621589437347162985 #1 Easy (348) Hidden Single: r6c2=3 Hidden Single: r5c3=6 Hidden Single: r4c8=1 Hidden Single: r2c2=1 Hidden Single: r6c1=1 Hidden Single: r4c9=3 Hidden Single: r8c8=3 Hidden Single: r1c1=4 Hidden Single: r4c5=4...
Easy
sudoku_normal_extremely_hard_82
6....2.....1.5..83.5.7.....9....67...8..1..3...49....5.....4.1.34..8.2.....2....6
698132574721459683453768192935846721286517439174923865562374918349681257817295346
sudoku_normal_extremely_hard_82
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
6 . . . . 2 . . . . . 1 . 5 . . 8 3 . 5 . 7 . . . . . 9 . . . . 6 7 . . . 8 . . 1 . . 3 . . . 4 9 . . . . 5 . . . . . 4 . 1 . 3 4 . . 8 . 2 . . . . . 2 . . . . 6
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
698132574721459683453768192935846721286517439174923865562374918349681257817295346 #1 Medium (874) Naked Single: r2c6=9 Locked Candidates Type 1 (Pointing): 2 in b3 => r3c13<>2 Locked Candidates Type 1 (Pointing): 7 in b3 => r1c23<>7 Locked Candidates Type 1 (Pointing): 1 in b7 => r9c6<>1 Naked Pair: 4,6 ...
Medium
sudoku_normal_extremely_hard_83
2..3...6...9.1...2.17..89..8..4..7...3.....2...2..6..4..42..13.5...7.4...6...9..8
248397561359614872617528943896432715435781629172956384984265137521873496763149258
sudoku_normal_extremely_hard_83
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
2 . . 3 . . . 6 . . . 9 . 1 . . . 2 . 1 7 . . 8 9 . . 8 . . 4 . . 7 . . . 3 . . . . . 2 . . . 2 . . 6 . . 4 . . 4 2 . . 1 3 . 5 . . . 7 . 4 . . . 6 . . . 9 . . 8
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
248397561359614872617528943896432715435781629172956384984265137521873496763149258 #1 Easy (212) Naked Single: r7c6=5 Naked Single: r8c8=9 Naked Single: r9c4=1 Naked Single: r8c9=6 Naked Single: r8c6=3 Naked Single: r9c3=3 Naked Single: r7c9=7 Naked Single: r8c4=8 Naked Single: r9c5=4 Full ...
Easy
sudoku_normal_extremely_hard_84
..9.5.1.......9..28..6...3..7...4..6..5.9.3..2..3...1..4...8..76..2.......8.4.5..
429753168316489752857621439973514286165892374284367915542138697691275843738946521
sudoku_normal_extremely_hard_84
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . 9 . 5 . 1 . . . . . . . 9 . . 2 8 . . 6 . . . 3 . . 7 . . . 4 . . 6 . . 5 . 9 . 3 . . 2 . . 3 . . . 1 . . 4 . . . 8 . . 7 6 . . 2 . . . . . . . 8 . 4 . 5 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
429753168316489752857621439973514286165892374284367915542138697691275843738946521 #1 Medium (544) Naked Pair: 4,8 in r15c9 => r368c9<>4, r68c9<>8 Naked Pair: 5,9 in r36c9 => r89c9<>9 Naked Triple: 2,6,9 in r7c78,r9c8 => r8c78<>9 Hidden Single: r8c2=9 Hidden Single: r4c1=9 Hidden Single: r8c6=5 Hidd...
Medium
sudoku_normal_extremely_hard_85
4..7...2...8...3...6..59..7..43...9.5...8...3.3...14..6..19..7...5...6...7...2..1
451738926798216354362459187184367295526984713937521468643195872215873649879642531
sudoku_normal_extremely_hard_85
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
4 . . 7 . . . 2 . . . 8 . . . 3 . . . 6 . . 5 9 . . 7 . . 4 3 . . . 9 . 5 . . . 8 . . . 3 . 3 . . . 1 4 . . 6 . . 1 9 . . 7 . . . 5 . . . 6 . . . 7 . . . 2 . . 1
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
451738926798216354362459187184367295526984713937521468643195872215873649879642531 #1 Medium (566) Hidden Single: r2c1=7 Locked Candidates Type 1 (Pointing): 3 in b2 => r1c3<>3 Hidden Pair: 6,7 in r56c3 => r5c3<>1, r56c3<>2, r56c3<>9 Locked Candidates Type 2 (Claiming): 1 in c3 => r12c2,r3c1<>1 Hidden Tri...
Medium
sudoku_normal_extremely_hard_86
..6..2..1...5..3..9..4...2..3..28.76..8.9.5..16.73..9..2...9..4..5..6...4..8..1..
356982741742561389981473625539128476278694513164735298627319854815246937493857162
sudoku_normal_extremely_hard_86
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . 6 . . 2 . . 1 . . . 5 . . 3 . . 9 . . 4 . . . 2 . . 3 . . 2 8 . 7 6 . . 8 . 9 . 5 . . 1 6 . 7 3 . . 9 . . 2 . . . 9 . . 4 . . 5 . . 6 . . . 4 . . 8 . . 1 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
356982741742561389981473625539128476278694513164735298627319854815246937493857162 #1 Easy (208) Naked Single: r4c4=1 Naked Single: r4c1=5 Naked Single: r4c7=4 Full House: r4c3=9 Naked Single: r5c4=6 Naked Single: r5c6=4 Full House: r6c6=5 Naked Single: r7c4=3 Naked Single: r5c2=7 Naked Sin...
Easy
sudoku_normal_extremely_hard_87
.3.2..6..1....5.3...5.7...86..1...2...3...9...9...8..48...5.7...5.6....1..2..4.9.
438291657176485239925376148647139825583742916291568374814953762359627481762814593
sudoku_normal_extremely_hard_87
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. 3 . 2 . . 6 . . 1 . . . . 5 . 3 . . . 5 . 7 . . . 8 6 . . 1 . . . 2 . . . 3 . . . 9 . . . 9 . . . 8 . . 4 8 . . . 5 . 7 . . . 5 . 6 . . . . 1 . . 2 . . 4 . 9 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
438291657176485239925376148647139825583742916291568374814953762359627481762814593 #1 Medium (470) Locked Candidates Type 2 (Claiming): 5 in r4 => r5c89,r6c78<>5 Hidden Single: r1c8=5 Locked Candidates Type 1 (Pointing): 1 in b3 => r3c6<>1 Locked Candidates Type 1 (Pointing): 7 in b3 => r45c9<>7 Naked Sin...
Medium
sudoku_normal_extremely_hard_88
..9.6.5...1...5.7.5..4....3.8....9.....1.7.....4....6.1....8..5.7.9...8...3.2.4..
329761548418235679567489123781643952652197834934852761146378295275914386893526417
sudoku_normal_extremely_hard_88
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . 9 . 6 . 5 . . . 1 . . . 5 . 7 . 5 . . 4 . . . . 3 . 8 . . . . 9 . . . . . 1 . 7 . . . . . 4 . . . . 6 . 1 . . . . 8 . . 5 . 7 . 9 . . . 8 . . . 3 . 2 . 4 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
329761548418235679567489123781643952652197834934852761146378295275914386893526417 #1 Easy (368) Hidden Single: r4c3=1 Hidden Single: r9c1=8 Hidden Single: r3c3=7 Hidden Single: r1c4=7 Hidden Single: r7c5=7 Hidden Single: r2c3=8 Hidden Single: r9c9=7 Hidden Single: r1c9=8 Hidden Single: r6c7=7...
Easy
sudoku_normal_extremely_hard_89
.4.5..1..2.......3..8.3..2.9..1....6.8..5..7.6....4..1.9..8.3..4.......9..2..5.6.
347526198269841753518739624923178546184653972675294831796482315451367289832915467
sudoku_normal_extremely_hard_89
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. 4 . 5 . . 1 . . 2 . . . . . . . 3 . . 8 . 3 . . 2 . 9 . . 1 . . . . 6 . 8 . . 5 . . 7 . 6 . . . . 4 . . 1 . 9 . . 8 . 3 . . 4 . . . . . . . 9 . . 2 . . 5 . 6 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
347526198269841753518739624923178546184653972675294831796482315451367289832915467 #1 Medium (304) Hidden Single: r9c1=8 Hidden Single: r1c9=8 Naked Single: r1c8=9 Hidden Single: r2c3=9 Locked Pair: 4,7 in r9c79 => r7c9,r8c7,r9c245<>7, r7c89,r9c45<>4 Hidden Single: r2c5=4 Naked Single: r2c8=5 Nak...
Medium
sudoku_normal_extremely_hard_90
...62...9..7..5....1....4..5..4...8.3...8...2.9...1..6..5....9....7..1..2...63...
853624719467915238912378465526497381341586972798231546135842697684759123279163854
sudoku_normal_extremely_hard_90
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . . 6 2 . . . 9 . . 7 . . 5 . . . . 1 . . . . 4 . . 5 . . 4 . . . 8 . 3 . . . 8 . . . 2 . 9 . . . 1 . . 6 . . 5 . . . . 9 . . . . 7 . . 1 . . 2 . . . 6 3 . . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
853624719467915238912378465526497381341586972798231546135842697684759123279163854 #1 Easy (332) Hidden Single: r1c2=5 Hidden Single: r1c8=1 Hidden Single: r7c1=1 Naked Single: r7c5=4 Hidden Single: r4c9=1 Hidden Single: r5c3=1 Hidden Single: r2c5=1 Hidden Single: r9c4=1 Hidden Single: r6c1=7 ...
Easy
sudoku_normal_extremely_hard_91
.5...7..3..7.4.2..1..6...8...61......2.....5......86...7...4..9..3.2.4..8..9...1.
659287143387541296142639587496152738728463951531798624275314869913826475864975312
sudoku_normal_extremely_hard_91
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. 5 . . . 7 . . 3 . . 7 . 4 . 2 . . 1 . . 6 . . . 8 . . . 6 1 . . . . . . 2 . . . . . 5 . . . . . . 8 6 . . . 7 . . . 4 . . 9 . . 3 . 2 . 4 . . 8 . . 9 . . . 1 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
659287143387541296142639587496152738728463951531798624275314869913826475864975312 #1 Hard (438) Hidden Pair: 1,8 in r17c5 => r1c5<>9, r7c5<>3, r7c5<>5, r7c5<>6 X-Wing: 6 r17 c18 => r2c18,r8c18<>6 Naked Single: r2c8=9 Naked Single: r8c8=7 Naked Single: r1c7=1 Naked Single: r2c1=3 Naked Single: r1c5=...
Hard
sudoku_normal_extremely_hard_92
..8.5...4.1...4.7.7..2..1...3...6..2..5...9..6..3...8...4..9..1.9.8...4.2...6.7..
968157324512634879743298156437986512185742963629315487874529631396871245251463798
sudoku_normal_extremely_hard_92
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . 8 . 5 . . . 4 . 1 . . . 4 . 7 . 7 . . 2 . . 1 . . . 3 . . . 6 . . 2 . . 5 . . . 9 . . 6 . . 3 . . . 8 . . . 4 . . 9 . . 1 . 9 . 8 . . . 4 . 2 . . . 6 . 7 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
968157324512634879743298156437986512185742963629315487874529631396871245251463798 #1 Medium (340) Hidden Single: r3c2=4 Hidden Single: r9c4=4 Hidden Single: r2c1=5 Locked Pair: 4,5 in r46c7 => r4c8,r6c9,r78c7<>5 Naked Single: r4c8=1 Naked Single: r6c9=7 Naked Single: r6c2=2 Naked Single: r1c2=6 ...
Medium
sudoku_normal_extremely_hard_93
.2......55....14....7.4..6..8.9.6...1...5...2...1.2.9..9..3.8....47....36......1.
426897135538261479917345268382976541169453782745182396291634857854719623673528914
sudoku_normal_extremely_hard_93
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. 2 . . . . . . 5 5 . . . . 1 4 . . . . 7 . 4 . . 6 . . 8 . 9 . 6 . . . 1 . . . 5 . . . 2 . . . 1 . 2 . 9 . . 9 . . 3 . 8 . . . . 4 7 . . . . 3 6 . . . . . . 1 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
426897135538261479917345268382976541169453782745182396291634857854719623673528914 #1 Easy (284) Naked Single: r4c5=7 Naked Single: r6c5=8 Hidden Single: r5c3=9 Hidden Single: r1c1=4 Hidden Single: r7c3=1 Naked Single: r8c2=5 Naked Single: r8c8=2 Naked Single: r8c1=8 Naked Single: r8c6=9 Na...
Easy
sudoku_normal_extremely_hard_94
..1.8..2...2..1....7...9..4.2.5..1..8...6...9..6..2.4.3..4...6....2..4...9..3.7..
961784325482351697573629814729548136845163279136972548358417962617295483294836751
sudoku_normal_extremely_hard_94
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . 1 . 8 . . 2 . . . 2 . . 1 . . . . 7 . . . 9 . . 4 . 2 . 5 . . 1 . . 8 . . . 6 . . . 9 . . 6 . . 2 . 4 . 3 . . 4 . . . 6 . . . . 2 . . 4 . . . 9 . . 3 . 7 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
961784325482351697573629814729548136845163279136972548358417962617295483294836751 #1 Easy (364) Hidden Single: r3c8=1 Hidden Single: r5c7=2 Hidden Single: r4c9=6 Hidden Single: r3c5=2 Hidden Single: r9c1=2 Hidden Single: r4c3=9 Hidden Single: r6c4=9 Hidden Single: r7c9=2 Hidden Single: r9c3=4...
Easy
sudoku_normal_extremely_hard_95
3....8.7.....6.4.9.1.5.....4....91...7.....4...26....3.....1.6.6.8.5.....5.8....2
396428571527163489814597236465389127973215648182674953249731865638952714751846392
sudoku_normal_extremely_hard_95
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
3 . . . . 8 . 7 . . . . . 6 . 4 . 9 . 1 . 5 . . . . . 4 . . . . 9 1 . . . 7 . . . . . 4 . . . 2 6 . . . . 3 . . . . . 1 . 6 . 6 . 8 . 5 . . . . . 5 . 8 . . . . 2
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
396428571527163489814597236465389127973215648182674953249731865638952714751846392 #1 Medium (528) Hidden Single: r9c6=6 Locked Candidates Type 1 (Pointing): 1 in b7 => r9c8<>1 Naked Triple: 3,7,9 in r89c7,r9c8 => r7c7,r8c8<>3, r7c79,r8c9<>7, r7c7,r8c8<>9 Naked Single: r8c8=1 Naked Single: r8c9=4 Hidde...
Medium
sudoku_normal_extremely_hard_96
.2...6..1...7..3..1.9.3..8..4.8....9..3...5..7....5.2..5..2.4.6..1..9...6..5...3.
328956741564781392179432685245863179813297564796145823957328416431679258682514937
sudoku_normal_extremely_hard_96
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. 2 . . . 6 . . 1 . . . 7 . . 3 . . 1 . 9 . 3 . . 8 . . 4 . 8 . . . . 9 . . 3 . . . 5 . . 7 . . . . 5 . 2 . . 5 . . 2 . 4 . 6 . . 1 . . 9 . . . 6 . . 5 . . . 3 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
328956741564781392179432685245863179813297564796145823957328416431679258682514937 #1 Medium (330) Hidden Single: r1c1=3 Hidden Single: r3c9=5 Hidden Single: r4c6=3 Hidden Single: r6c9=3 Hidden Single: r8c2=3 Hidden Single: r8c8=5 Hidden Single: r7c4=3 Locked Pair: 2,4 in r3c46 => r2c6,r3c7<>2, r...
Medium
sudoku_normal_extremely_hard_97
9..4.2..3..2....9..7..1......6..7.1..3..5..6..1.6..8......7..8..6....4..7..3.4..9
958462173142783596673915248426837915839251764517649832294576381365198427781324659
sudoku_normal_extremely_hard_97
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
9 . . 4 . 2 . . 3 . . 2 . . . . 9 . . 7 . . 1 . . . . . . 6 . . 7 . 1 . . 3 . . 5 . . 6 . . 1 . 6 . . 8 . . . . . . 7 . . 8 . . 6 . . . . 4 . . 7 . . 3 . 4 . . 9
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
958462173142783596673915248426837915839251764517649832294576381365198427781324659 #1 Hard (534) Hidden Single: r2c4=7 X-Wing: 1 r19 c37 => r27c7,r78c3<>1 X-Wing: 6 r19 c57 => r2c57,r37c7<>6 Naked Single: r2c7=5 Naked Single: r1c8=7 Naked Single: r3c7=2 Naked Single: r3c8=4 Naked Single: r7c7=3 ...
Hard
sudoku_normal_extremely_hard_98
..2..48...6.....1.1..9....3..5..6..9.3..1..4.4..8..5..2....3..4.9.....6...82..7..
372154896569328417184967253815746329937512648426839571251673984793485162648291735
sudoku_normal_extremely_hard_98
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. . 2 . . 4 8 . . . 6 . . . . . 1 . 1 . . 9 . . . . 3 . . 5 . . 6 . . 9 . 3 . . 1 . . 4 . 4 . . 8 . . 5 . . 2 . . . . 3 . . 4 . 9 . . . . . 6 . . . 8 2 . . 7 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
372154896569328417184967253815746329937512648426839571251673984793485162648291735 #1 Easy (404) Hidden Single: r1c4=1 Hidden Single: r7c4=6 Hidden Single: r9c1=6 Hidden Single: r9c8=3 Hidden Single: r6c5=3 Hidden Single: r4c7=3 Hidden Single: r1c1=3 Hidden Single: r2c4=3 Hidden Single: r4c2=1...
Easy
sudoku_normal_extremely_hard_99
.3..7..2...4..6..85..8..9...6..1...3..9...1..1...2..7...5..4..62..1..8...7..9..4.
638971524914256738527843961762519483489367152153428679395784216246135897871692345
sudoku_normal_extremely_hard_99
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid. "
None
9
9
. 3 . . 7 . . 2 . . . 4 . . 6 . . 8 5 . . 8 . . 9 . . . 6 . . 1 . . . 3 . . 9 . . . 1 . . 1 . . . 2 . . 7 . . . 5 . . 4 . . 6 2 . . 1 . . 8 . . . 7 . . 9 . . 4 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
638971524914256738527843961762519483489367152153428679395784216246135897871692345 #1 Medium (640) Hidden Single: r8c2=4 Locked Candidates Type 1 (Pointing): 9 in b7 => r7c8<>9 Hidden Pair: 2,7 in r7c47 => r7c47<>3 Hidden Pair: 2,7 in r34c3 => r3c3<>1, r3c3<>6, r4c3<>8 Hidden Single: r3c8=6 Hidden Sing...
Medium
sudoku_normal_extremely_hard_100
....5..16.2...9...1.54..9..4.9.......5.14........7..355...9.7...8......12....1...
394857216628319547175426983439685172752143698861972435513298764987564321246731859
sudoku_normal_extremely_hard_100
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . . . 5 . . 1 6 . 2 . . . 9 . . . 1 . 5 4 . . 9 . . 4 . 9 . . . . . . . 5 . 1 4 . . . . . . . . 7 . . 3 5 5 . . . 9 . 7 . . . 8 . . . . . . 1 2 . . . . 1 . . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
394857216628319547175426983439685172752143698861972435513298764987564321246731859 #1 Extreme (31972) bf Hidden Single: r2c5=1 Hidden Single: r6c4=9 Hidden Single: r6c7=4 Hidden Single: r4c7=1 Locked Candidates Type 1 (Pointing): 4 in b3 => r2c3<>4 Hidden Rectangle: 1/6 in r6c23,r7c23 => r7c3<>6 Bru...
Extreme
sudoku_normal_extremely_hard_101
..1..7..2....1..5.9..3..1...956.3...6.........83.526...4......1..9..4.7.5..8..9..
851967432436218759972345168795683214624179385183452697348796521219534876567821943
sudoku_normal_extremely_hard_101
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . 1 . . 7 . . 2 . . . . 1 . . 5 . 9 . . 3 . . 1 . . . 9 5 6 . 3 . . . 6 . . . . . . . . . 8 3 . 5 2 6 . . . 4 . . . . . . 1 . . 9 . . 4 . 7 . 5 . . 8 . . 9 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
851967432436218759972345168795683214624179385183452697348796521219534876567821943 #1 Extreme (23442) bf Brute Force: r5c5=7 Hidden Single: r7c4=7 Locked Candidates Type 1 (Pointing): 7 in b4 => r2c1<>7 Forcing Net Contradiction in r3 => r4c8<>8 r4c8=8 r4c8<>1 r4c1=1 r5c2<>1 r5c2=2 r5c3<>2 r5c3=4 r3c3<>4 ...
Extreme
sudoku_normal_extremely_hard_102
7....8..3..5....6....65..1.3....4..8..7....2..2..1.3...48..97..9.........73.....9
716298543835471962492653817369524178187936425524817396248369751951782634673145289
sudoku_normal_extremely_hard_102
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
7 . . . . 8 . . 3 . . 5 . . . . 6 . . . . 6 5 . . 1 . 3 . . . . 4 . . 8 . . 7 . . . . 2 . . 2 . . 1 . 3 . . . 4 8 . . 9 7 . . 9 . . . . . . . . . 7 3 . . . . . 9
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
716298543835471962492653817369524178187936425524817396248369751951782634673145289 #1 Extreme (39912) bf Locked Candidates Type 1 (Pointing): 7 in b3 => r6c9<>7 Locked Candidates Type 1 (Pointing): 8 in b3 => r89c7<>8 Brute Force: r5c5=3 Locked Candidates Type 1 (Pointing): 8 in b5 => r89c4<>8 Brute Force...
Extreme
sudoku_normal_extremely_hard_103
.....4..2..81...3..7..6.9..5....92............6..3...4.3..7.5....18.....4....3.2.
153794862698125437274368951517649283349281675862537194936472518721856349485913726
sudoku_normal_extremely_hard_103
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . . . . 4 . . 2 . . 8 1 . . . 3 . . 7 . . 6 . 9 . . 5 . . . . 9 2 . . . . . . . . . . . . 6 . . 3 . . . 4 . 3 . . 7 . 5 . . . . 1 8 . . . . . 4 . . . . 3 . 2 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
153794862698125437274368951517649283349281675862537194936472518721856349485913726 #1 Extreme (24512) bf AIC: 3/4 4- r3c3 =4= r3c8 -4- r2c7 =4= r8c7 =3= r8c9 -3- r4c9 =3= r4c3 -3 => r3c3<>3, r4c3<>4 Brute Force: r5c5=8 Hidden Single: r3c6=8 Finned X-Wing: 8 c29 r49 fr7c9 => r9c7<>8 Forcing Net Contradicti...
Extreme
sudoku_normal_extremely_hard_104
7..4...9..5.7.82....2.5....5...8.7....36....1.1.......2...4.9.....5.3....45....6.
786432195159768234432159678564381729923674581817295346271846953698523417345917862
sudoku_normal_extremely_hard_104
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
7 . . 4 . . . 9 . . 5 . 7 . 8 2 . . . . 2 . 5 . . . . 5 . . . 8 . 7 . . . . 3 6 . . . . 1 . 1 . . . . . . . 2 . . . 4 . 9 . . . . . 5 . 3 . . . . 4 5 . . . . 6 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
786432195159768234432159678564381729923674581817295346271846953698523417345917862 #1 Extreme (39004) bf Brute Force: r5c7=5 Hidden Single: r1c9=5 Hidden Single: r6c6=5 Hidden Single: r7c8=5 Brute Force: r5c6=4 Locked Candidates Type 1 (Pointing): 7 in b5 => r89c5<>7 Discontinuous Nice Loop: 9 r4c2 ...
Extreme
sudoku_normal_extremely_hard_105
7....5..3..24...1..1....5....79...51....8...6.612...9.17...9.4...9......42.7.....
794615283532478619816392574287946351945183726361257498173569842659824137428731965
sudoku_normal_extremely_hard_105
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
7 . . . . 5 . . 3 . . 2 4 . . . 1 . . 1 . . . . 5 . . . . 7 9 . . . 5 1 . . . . 8 . . . 6 . 6 1 2 . . . 9 . 1 7 . . . 9 . 4 . . . 9 . . . . . . 4 2 . 7 . . . . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
794615283532478619816392574287946351945183726361257498173569842659824137428731965 #1 Extreme (20538) bf Finned X-Wing: 2 c69 r38 fr7c9 => r8c78<>2 Brute Force: r5c4=1 Hidden Single: r1c5=1 Hidden Single: r6c5=5 Locked Candidates Type 1 (Pointing): 2 in b2 => r3c89<>2 Locked Candidates Type 1 (Pointing...
Extreme
sudoku_normal_extremely_hard_106
7...816.........51.9.........9.47...2..6..4...4..28..39...74.3..1.....4.4....68..
753481692824963751691752384569347128238619475147528963982174536316895247475236819
sudoku_normal_extremely_hard_106
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
7 . . . 8 1 6 . . . . . . . . . 5 1 . 9 . . . . . . . . . 9 . 4 7 . . . 2 . . 6 . . 4 . . . 4 . . 2 8 . . 3 9 . . . 7 4 . 3 . . 1 . . . . . 4 . 4 . . . . 6 8 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
753481692824963751691752384569347128238619475147528963982174536316895247475236819 #1 Extreme (30012) bf Locked Candidates Type 1 (Pointing): 8 in b3 => r3c13<>8 Locked Candidates Type 1 (Pointing): 6 in b9 => r4c9<>6 Brute Force: r5c3=8 Brute Force: r5c5=1 Grouped Discontinuous Nice Loop: 5 r3c3 -5- r1c2...
Extreme
sudoku_normal_extremely_hard_107
.....2.6..1..5.4..2..7......6..2.8.4.......39.5..896..4.1.6..8..8.......6.5...1..
574192368819653427236748915967321854148576239352489671421965783783214596695837142
sudoku_normal_extremely_hard_107
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . . . . 2 . 6 . . 1 . . 5 . 4 . . 2 . . 7 . . . . . . 6 . . 2 . 8 . 4 . . . . . . . 3 9 . 5 . . 8 9 6 . . 4 . 1 . 6 . . 8 . . 8 . . . . . . . 6 . 5 . . . 1 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
574192368819653427236748915967321854148576239352489671421965783783214596695837142 #1 Extreme (21512) bf Hidden Single: r8c9=6 Hidden Single: r1c1=5 Brute Force: r5c4=5 Hidden Single: r4c8=5 Hidden Single: r5c6=6 Hidden Single: r2c4=6 Hidden Single: r3c3=6 Locked Candidates Type 1 (Pointing): 1 i...
Extreme
sudoku_normal_extremely_hard_108
...6...7...4...9...3..8...2....7..5...8.4...1.....6.9..423......13..5...8...1...3
289634175674251938135987462421879356968543721357126894542398617713465289896712543
sudoku_normal_extremely_hard_108
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . . 6 . . . 7 . . . 4 . . . 9 . . . 3 . . 8 . . . 2 . . . . 7 . . 5 . . . 8 . 4 . . . 1 . . . . . 6 . 9 . . 4 2 3 . . . . . . 1 3 . . 5 . . . 8 . . . 1 . . . 3
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
289634175674251938135987462421879356968543721357126894542398617713465289896712543 #1 Extreme (26340) bf Forcing Net Contradiction in r3 => r7c9<>6 r7c9=6 (r7c1<>6) (r7c5<>6 r7c5=9 r7c1<>9) (r7c5<>6 r8c5=6 r8c1<>6) r7c9<>9 r8c9=9 r8c1<>9 r8c1=7 r7c1<>7 r7c1=5 r3c1<>5 r7c9=6 (r7c9<>7) r7c9<>9 r8c9=9 (r8c1<>9 r8c1=...
Extreme
sudoku_normal_extremely_hard_109
..8.5..1.4..1....2.1...63...4.......2...4..7...79....8.....36....4.9..2.5..7....9
368254917475139862912876354843567291291348576657921438729413685184695723536782149
sudoku_normal_extremely_hard_109
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . 8 . 5 . . 1 . 4 . . 1 . . . . 2 . 1 . . . 6 3 . . . 4 . . . . . . . 2 . . . 4 . . 7 . . . 7 9 . . . . 8 . . . . . 3 6 . . . . 4 . 9 . . 2 . 5 . . 7 . . . . 9
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
368254917475139862912876354843567291291348576657921438729413685184695723536782149 #1 Extreme (20530) bf Brute Force: r5c4=3 Hidden Single: r2c5=3 Skyscraper: 3 in r8c9,r9c3 (connected by r4c39) => r8c12,r9c8<>3 Hidden Single: r8c9=3 Grouped AIC: 8/9 9- r2c6 =9= r1c6 =4= r9c6 -4- r9c8 -8- r89c7 =8= r2c7 -...
Extreme
sudoku_normal_extremely_hard_110
71.9..6......1...22.46...9..2.4....5....72..3..7...4..6..2........7.1.464.1..9..7
718925634963814572254637198129483765546172983837596421675248319392751846481369257
sudoku_normal_extremely_hard_110
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
7 1 . 9 . . 6 . . . . . . 1 . . . 2 2 . 4 6 . . . 9 . . 2 . 4 . . . . 5 . . . . 7 2 . . 3 . . 7 . . . 4 . . 6 . . 2 . . . . . . . . 7 . 1 . 4 6 4 . 1 . . 9 . . 7
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
718925634963814572254637198129483765546172983837596421675248319392751846481369257 #1 Extreme (21124) bf Hidden Single: r1c5=2 Hidden Single: r6c8=2 Hidden Single: r2c6=4 Hidden Single: r1c9=4 Hidden Single: r5c2=4 Hidden Single: r8c3=2 Hidden Single: r9c5=6 Hidden Single: r7c2=7 Hidden Single...
Extreme
sudoku_normal_extremely_hard_111
7....9..69.5..2..4.1..3.....5.........78...2.2....5..7.2...476...49....26.....4..
783549216965182374412637598856723941347891625291465837128354769534976182679218453
sudoku_normal_extremely_hard_111
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
7 . . . . 9 . . 6 9 . 5 . . 2 . . 4 . 1 . . 3 . . . . . 5 . . . . . . . . . 7 8 . . . 2 . 2 . . . . 5 . . 7 . 2 . . . 4 7 6 . . . 4 9 . . . . 2 6 . . . . . 4 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
783549216965182374412637598856723941347891625291465837128354769534976182679218453 #1 Extreme (45378) bf Brute Force: r5c5=9 Locked Candidates Type 2 (Claiming): 4 in r5 => r4c1,r6c2<>4 Brute Force: r5c2=4 Hidden Single: r3c1=4 Forcing Net Contradiction in r3c6 => r2c5<>6 r2c5=6 r3c6<>6 r2c5=6 (r2c4<>...
Extreme
sudoku_normal_extremely_hard_112
.2......8..4....9.5..1..2.....5......52.816..1...62....9..73.6.6.....9..2..6..8.7
721936458364825791589147236876594312952381674143762589498273165617458923235619847
sudoku_normal_extremely_hard_112
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. 2 . . . . . . 8 . . 4 . . . . 9 . 5 . . 1 . . 2 . . . . . 5 . . . . . . 5 2 . 8 1 6 . . 1 . . . 6 2 . . . . 9 . . 7 3 . 6 . 6 . . . . . 9 . . 2 . . 6 . . 8 . 7
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
721936458364825791589147236876594312952381674143762589498273165617458923235619847 #1 Extreme (33984) bf Brute Force: r4c9=2 Hidden Single: r8c8=2 Hidden Single: r7c4=2 Hidden Single: r2c5=2 Locked Candidates Type 1 (Pointing): 8 in b8 => r8c23<>8 Finned Swordfish: 1 r147 c378 fr7c9 => r9c8<>1 Finne...
Extreme
sudoku_normal_extremely_hard_113
.4...63....89....4...41..5..3.6..9..8....3.7...2......2.........9..6.1..7....9.35
149756382658932714327418659531627948864593271972184563285371496493865127716249835
sudoku_normal_extremely_hard_113
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. 4 . . . 6 3 . . . . 8 9 . . . . 4 . . . 4 1 . . 5 . . 3 . 6 . . 9 . . 8 . . . . 3 . 7 . . . 2 . . . . . . 2 . . . . . . . . . 9 . . 6 . 1 . . 7 . . . . 9 . 3 5
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
149756382658932714327418659531627948864593271972184563285371496493865127716249835 #1 Extreme (24726) bf Hidden Single: r2c5=3 Hidden Single: r6c9=3 Brute Force: r5c7=2 Hidden Single: r6c7=5 Locked Candidates Type 1 (Pointing): 4 in b6 => r78c8<>4 Locked Candidates Type 1 (Pointing): 2 in b9 => r8c46<>...
Extreme
sudoku_normal_extremely_hard_114
..8...7..3..1...6..9......54...3..2....2........6.43.7..53..8....9.1....6....2.4.
168495732354127968792863415476938521583271694921654387215349876849716253637582149
sudoku_normal_extremely_hard_114
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . 8 . . . 7 . . 3 . . 1 . . . 6 . . 9 . . . . . . 5 4 . . . 3 . . 2 . . . . 2 . . . . . . . . 6 . 4 3 . 7 . . 5 3 . . 8 . . . . 9 . 1 . . . . 6 . . . . 2 . 4 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
168495732354127968792863415476938521583271694921654387215349876849716253637582149 #1 Extreme (19284) bf Locked Candidates Type 1 (Pointing): 4 in b7 => r12c2<>4 Brute Force: r5c5=7 Finned Swordfish: 7 r249 c234 fr2c6 => r3c4<>7 Locked Candidates Type 1 (Pointing): 7 in b2 => r78c6<>7 Discontinuous Nice L...
Extreme
sudoku_normal_extremely_hard_115
.....2.6.26.95..1.9...1.2...........41...96...2.....84..42...3..3..7....69...51..
541782963263954817978613245386427591415839672729561384154298736832176459697345128
sudoku_normal_extremely_hard_115
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . . . . 2 . 6 . 2 6 . 9 5 . . 1 . 9 . . . 1 . 2 . . . . . . . . . . . 4 1 . . . 9 6 . . . 2 . . . . . 8 4 . . 4 2 . . . 3 . . 3 . . 7 . . . . 6 9 . . . 5 1 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
541782963263954817978613245386427591415839672729561384154298736832176459697345128 #1 Extreme (23992) bf Hidden Single: r7c5=9 Hidden Single: r4c9=1 Locked Candidates Type 2 (Claiming): 6 in c5 => r4c46,r6c46<>6 Hidden Pair: 6,9 in r46c3 => r46c3<>3, r46c3<>5, r46c3<>7, r4c3<>8 Brute Force: r5c4=8 Forc...
Extreme
sudoku_normal_extremely_hard_116
.2..5....4....9..6..98..7.......183...89....71......6.6...2...4.5...4.....43...7.
826157943417239586539846721965471832348962157172583469681725394753694218294318675
sudoku_normal_extremely_hard_116
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. 2 . . 5 . . . . 4 . . . . 9 . . 6 . . 9 8 . . 7 . . . . . . . 1 8 3 . . . 8 9 . . . . 7 1 . . . . . . 6 . 6 . . . 2 . . . 4 . 5 . . . 4 . . . . . 4 3 . . . 7 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
826157943417239586539846721965471832348962157172583469681725394753694218294318675 #1 Extreme (19906) bf Brute Force: r5c6=2 Hidden Single: r2c4=2 Naked Pair: 3,5 in r35c1 => r18c1<>3, r4c1<>5 Grouped Discontinuous Nice Loop: 4 r5c5 -4- r3c5 =4= r3c8 =2= r3c9 -2- r46c9 =2= r6c7 =4= r5c78 -4- r5c5 => r5c5<>4 ...
Extreme
sudoku_normal_extremely_hard_117
3...7.52.........7..75..31...143.9.2.....9.4..9.....5...2.1...5.4.6.....6....8...
386971524915243867427586319561437982238159746794862153872314695143695278659728431
sudoku_normal_extremely_hard_117
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
3 . . . 7 . 5 2 . . . . . . . . . 7 . . 7 5 . . 3 1 . . . 1 4 3 . 9 . 2 . . . . . 9 . 4 . . 9 . . . . . 5 . . . 2 . 1 . . . 5 . 4 . 6 . . . . . 6 . . . . 8 . . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
386971524915243867427586319561437982238159746794862153872314695143695278659728431 #1 Extreme (15290) bf Locked Candidates Type 1 (Pointing): 3 in b6 => r89c9<>3 Brute Force: r5c9=6 Hidden Single: r6c9=3 Locked Candidates Type 1 (Pointing): 6 in b3 => r2c2356<>6 Locked Candidates Type 1 (Pointing): 1 in b...
Extreme
sudoku_normal_extremely_hard_118
..582.....2.1..6....9..5......9.1....8..562..9.628...5..86.....6.2...3.4.1......6
165827943824139657739465182253941768481756239976283415348672591692518374517394826
sudoku_normal_extremely_hard_118
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . 5 8 2 . . . . . 2 . 1 . . 6 . . . . 9 . . 5 . . . . . . 9 . 1 . . . . 8 . . 5 6 2 . . 9 . 6 2 8 . . . 5 . . 8 6 . . . . . 6 . 2 . . . 3 . 4 . 1 . . . . . . 6
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
165827943824139657739465182253941768481756239976283415348672591692518374517394826 #1 Extreme (27050) bf Hidden Single: r2c8=5 Hidden Single: r3c5=6 Hidden Single: r1c2=6 Hidden Single: r4c1=2 Hidden Single: r5c3=1 Hidden Single: r4c8=6 Hidden Single: r4c2=5 Hidden Single: r8c4=5 Brute Force: ...
Extreme
sudoku_normal_extremely_hard_119
.5..4..7...7..9...8.....2....61......4..7..3..7..526......2.3.4.2.4........5.7.2.
652843179317269485894715263236184597145976832978352641789621354523498716461537928
sudoku_normal_extremely_hard_119
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. 5 . . 4 . . 7 . . . 7 . . 9 . . . 8 . . . . . 2 . . . . 6 1 . . . . . . 4 . . 7 . . 3 . . 7 . . 5 2 6 . . . . . . 2 . 3 . 4 . 2 . 4 . . . . . . . . 5 . 7 . 2 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
652843179317269485894715263236184597145976832978352641789621354523498716461537928 #1 Extreme (20230) bf Hidden Single: r6c8=4 Hidden Single: r4c6=4 Hidden Single: r3c6=5 Hidden Single: r3c4=7 Hidden Single: r7c1=7 Hidden Single: r3c3=4 Hidden Single: r2c7=4 Hidden Single: r9c1=4 Almost Locked...
Extreme
sudoku_normal_extremely_hard_120
.....2..95...3.....1.7..3...6.41..7...4..8......6..4..9......5...8.....2.7..6.1..
743182569586934217219756384362419875154378926897625431921847653638591742475263198
sudoku_normal_extremely_hard_120
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . . . . 2 . . 9 5 . . . 3 . . . . . 1 . 7 . . 3 . . . 6 . 4 1 . . 7 . . . 4 . . 8 . . . . . . 6 . . 4 . . 9 . . . . . . 5 . . . 8 . . . . . 2 . 7 . . 6 . 1 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
743182569586934217219756384362419875154378926897625431921847653638591742475263198 #1 Extreme (29284) bf Hidden Pair: 1,6 in r7c3,r8c1 => r7c3<>2, r7c3,r8c1<>3, r8c1<>4 Forcing Net Contradiction in r8 => r6c8<>1 r6c8=1 (r5c8<>1) r5c9<>1 r5c1=1 r5c1<>7 r5c5=7 r8c5<>7 r6c8=1 (r1c8<>1 r1c4=1 r8c4<>1) (r5c8<>1) r5...
Extreme
sudoku_normal_extremely_hard_121
.5....67...9.....28....1.4.7....8...4..3...1...2.9........5...6.....7.3....8.34..
253489671149736852867521943731268594496375218582194367314952786928647135675813429
sudoku_normal_extremely_hard_121
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. 5 . . . . 6 7 . . . 9 . . . . . 2 8 . . . . 1 . 4 . 7 . . . . 8 . . . 4 . . 3 . . . 1 . . . 2 . 9 . . . . . . . . 5 . . . 6 . . . . . 7 . 3 . . . . 8 . 3 4 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
253489671149736852867521943731268594496375218582194367314952786928647135675813429 #1 Extreme (39944) bf Locked Candidates Type 1 (Pointing): 9 in b4 => r789c2<>9 Almost Locked Set XY-Wing: A=r1c13469 {123489}, B=r34589c5 {123467}, C=r2c8,r3c79 {3589}, X,Y=3,8, Z=2,4 => r1c5<>2, r1c5<>4 Brute Force: r5c6=5 N...
Extreme
sudoku_normal_extremely_hard_122
.....54....98....3.4..3..6....5..79...26......7..9...61....8.3..3..1.6..2.43....1
783265419629841573541739862416523798392687145875194326167958234938412657254376981
sudoku_normal_extremely_hard_122
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . . . . 5 4 . . . . 9 8 . . . . 3 . 4 . . 3 . . 6 . . . . 5 . . 7 9 . . . 2 6 . . . . . . 7 . . 9 . . . 6 1 . . . . 8 . 3 . . 3 . . 1 . 6 . . 2 . 4 3 . . . . 1
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
783265419629841573541739862416523798392687145875194326167958234938412657254376981 #1 Extreme (25748) bf Brute Force: r5c5=8 Hidden Single: r5c6=7 Forcing Net Contradiction in c8 => r4c9<>4 r4c9=4 (r6c8<>4 r8c8=4 r8c8<>5) (r5c8<>4) r5c9<>4 (r5c9=5 r5c2<>5) (r5c9=5 r8c9<>5) r5c1=4 r5c1<>9 r8c1=9 r8c1<>5 r8c3=5...
Extreme
sudoku_normal_extremely_hard_123
..1.3.8..9....2.6..2......42...5..3...4.....8...2..7...1..69.....7..56..6..3...5.
561734829948512367723986514279458136154673298836291745315869472497125683682347951
sudoku_normal_extremely_hard_123
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . 1 . 3 . 8 . . 9 . . . . 2 . 6 . . 2 . . . . . . 4 2 . . . 5 . . 3 . . . 4 . . . . . 8 . . . 2 . . 7 . . . 1 . . 6 9 . . . . . 7 . . 5 6 . . 6 . . 3 . . . 5 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
561734829948512367723986514279458136154673298836291745315869472497125683682347951 #1 Extreme (16140) bf Discontinuous Nice Loop: 5 r1c9 -5- r6c9 =5= r5c7 =2= r5c8 -2- r1c8 =2= r1c9 => r1c9<>5 Brute Force: r5c5=7 Hidden Single: r4c2=7 Skyscraper: 7 in r2c4,r9c6 (connected by r29c9) => r13c6,r7c4<>7 Hidden...
Extreme
sudoku_normal_extremely_hard_124
5.6.....7.9.5..3..3....2.......2..7......1..8..96..4...4.2...1.6..9.45......8.7.4
516349827298517346374862195183425679465791238729638451847256913631974582952183764
sudoku_normal_extremely_hard_124
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
5 . 6 . . . . . 7 . 9 . 5 . . 3 . . 3 . . . . 2 . . . . . . . 2 . . 7 . . . . . . 1 . . 8 . . 9 6 . . 4 . . . 4 . 2 . . . 1 . 6 . . 9 . 4 5 . . . . . . 8 . 7 . 4
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
516349827298517346374862195183425679465791238729638451847256913631974582952183764 #1 Extreme (26842) bf Brute Force: r5c3=5 Hidden Single: r9c2=5 Forcing Net Contradiction in r5c1 => r5c5<>7 r5c5=7 (r5c5<>9 r4c6=9 r4c6<>5 r4c9=5 r6c8<>5) (r6c5<>7) (r6c6<>7) r5c4<>7 r3c4=7 r2c6<>7 r7c6=7 r7c6<>5 r7c5=5 r6c5<>...
Extreme
sudoku_normal_extremely_hard_125
8...23....3...6.9...25..3....7.6.5..1....5..6...7...4..8......94......1...3..76..
816923457534876192972541368397468521148235976625719843781654239469382715253197684
sudoku_normal_extremely_hard_125
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
8 . . . 2 3 . . . . 3 . . . 6 . 9 . . . 2 5 . . 3 . . . . 7 . 6 . 5 . . 1 . . . . 5 . . 6 . . . 7 . . . 4 . . 8 . . . . . . 9 4 . . . . . . 1 . . . 3 . . 7 6 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
816923457534876192972541368397468521148235976625719843781654239469382715253197684 #1 Extreme (42092) bf Brute Force: r5c7=9 Hidden Single: r5c8=7 Locked Candidates Type 2 (Claiming): 3 in r5 => r4c4,r6c5<>3 Forcing Net Contradiction in c4 => r9c9<>2 r9c9=2 (r9c1<>2) (r9c8<>2 r4c8=2 r4c2<>2) (r9c2<>2) (r9c...
Extreme
sudoku_normal_extremely_hard_126
..6..9.2..4.36.5..1..........8..5..23...4.....6.1..7..6......89..5..72......8....
586479123249361578173852946718935462352746891964128735627514389835697214491283657
sudoku_normal_extremely_hard_126
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . 6 . . 9 . 2 . . 4 . 3 6 . 5 . . 1 . . . . . . . . . . 8 . . 5 . . 2 3 . . . 4 . . . . . 6 . 1 . . 7 . . 6 . . . . . . 8 9 . . 5 . . 7 2 . . . . . . 8 . . . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
586479123249361578173852946718935462352746891964128735627514389835697214491283657 #1 Extreme (31346) bf Locked Candidates Type 1 (Pointing): 5 in b9 => r9c4<>5 Locked Candidates Type 1 (Pointing): 7 in b9 => r9c123<>7 Hidden Pair: 5,7 in r9c89 => r9c89<>1, r9c89<>3, r9c89<>4, r9c89<>6 Brute Force: r5c7=8 ...
Extreme
sudoku_normal_extremely_hard_127
9.......7.7.42.8....8..7....4..69..2..6.7.3.....1...6.....3.51.5.........2...8..4
912586437675423891438917625847369152156872349293145768789234516564791283321658974
sudoku_normal_extremely_hard_127
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
9 . . . . . . . 7 . 7 . 4 2 . 8 . . . . 8 . . 7 . . . . 4 . . 6 9 . . 2 . . 6 . 7 . 3 . . . . . 1 . . . 6 . . . . . 3 . 5 1 . 5 . . . . . . . . . 2 . . . 8 . . 4
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
912586437675423891438917625847369152156872349293145768789234516564791283321658974 #1 Extreme (28602) bf Locked Candidates Type 1 (Pointing): 9 in b2 => r3c789<>9 Locked Candidates Type 1 (Pointing): 2 in b9 => r8c46<>2 Hidden Pair: 2,4 in r1c3,r3c1 => r1c3,r3c1<>1, r1c3,r3c1<>3, r1c3<>5, r3c1<>6 Brute Force...
Extreme
sudoku_normal_extremely_hard_128
.7.9..6.2..3..5.....6.2..8...7.9..1.6..7......9....5.7....7.2.9.....9.6.4..6.....
874913652213865794956427381347592816685741923192386547568174239731259468429638175
sudoku_normal_extremely_hard_128
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. 7 . 9 . . 6 . 2 . . 3 . . 5 . . . . . 6 . 2 . . 8 . . . 7 . 9 . . 1 . 6 . . 7 . . . . . . 9 . . . . 5 . 7 . . . . 7 . 2 . 9 . . . . . 9 . 6 . 4 . . 6 . . . . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
874913652213865794956427381347592816685741923192386547568174239731259468429638175 #1 Extreme (36012) bf Hidden Single: r3c6=7 Hidden Single: r9c3=9 Hidden Single: r4c9=6 Hidden Single: r8c1=7 Hidden Single: r2c5=6 Hidden Single: r7c2=6 Hidden Single: r6c6=6 Finned Swordfish: 2 r249 c126 fr4c4 =>...
Extreme
sudoku_normal_extremely_hard_129
.....23..21..7...59..5.........1..8.16......2..9.26.7.52...7..6..7....4..9.......
745192368216873495938564721372415689164789532859326174523947816687251943491638257
sudoku_normal_extremely_hard_129
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . . . . 2 3 . . 2 1 . . 7 . . . 5 9 . . 5 . . . . . . . . . 1 . . 8 . 1 6 . . . . . . 2 . . 9 . 2 6 . 7 . 5 2 . . . 7 . . 6 . . 7 . . . . 4 . . 9 . . . . . . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
745192368216873495938564721372415689164789532859326174523947816687251943491638257 #1 Extreme (23968) bf Hidden Single: r4c3=2 Hidden Single: r4c7=6 Hidden Single: r5c4=7 Empty Rectangle: 5 in b5 (r59c8) => r9c6<>5 Brute Force: r5c7=5 Hidden Single: r1c3=5 Hidden Single: r4c6=5 Hidden Single: r9c...
Extreme
sudoku_normal_extremely_hard_130
.896.2.17......9.6.....182....1...7.6....8..9.12.79.8..23........4...2..8..9.....
389652417251487936746391825938146572675238149412579683123865794594713268867924351
sudoku_normal_extremely_hard_130
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. 8 9 6 . 2 . 1 7 . . . . . . 9 . 6 . . . . . 1 8 2 . . . . 1 . . . 7 . 6 . . . . 8 . . 9 . 1 2 . 7 9 . 8 . . 2 3 . . . . . . . . 4 . . . 2 . . 8 . . 9 . . . . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
389652417251487936746391825938146572675238149412579683123865794594713268867924351 #1 Extreme (13472) bf Hidden Single: r5c7=1 Hidden Single: r6c7=6 Hidden Single: r2c1=2 Hidden Single: r4c9=2 Hidden Single: r4c3=8 Hidden Single: r3c5=9 Hidden Single: r9c5=2 Hidden Single: r5c4=2 Hidden Single...
Extreme
sudoku_normal_extremely_hard_131
...6..3..6...9..4..2...4..8..6.3...2.4....7..3....9.5...8.1...4...9...1.17...5...
814672395635198247729354168596731482241586739387429651968213574452967813173845926
sudoku_normal_extremely_hard_131
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . . 6 . . 3 . . 6 . . . 9 . . 4 . . 2 . . . 4 . . 8 . . 6 . 3 . . . 2 . 4 . . . . 7 . . 3 . . . . 9 . 5 . . . 8 . 1 . . . 4 . . . 9 . . . 1 . 1 7 . . . 5 . . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
814672395635198247729354168596731482241586739387429651968213574452967813173845926 #1 Extreme (16972) bf Brute Force: r5c5=8 Locked Candidates Type 1 (Pointing): 5 in b5 => r23c4<>5 Finned Swordfish: 8 r168 c267 fr1c1 => r2c2<>8 Locked Candidates Type 1 (Pointing): 8 in b1 => r1c6<>8 Discontinuous Nice Lo...
Extreme
sudoku_normal_extremely_hard_132
6.....8.2.728...6..1.6..57...17...2.2...8....76...4....9..3....1..9...8.....6...5
645379812972815463813642579451793628239186754768524931596238147124957386387461295
sudoku_normal_extremely_hard_132
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
6 . . . . . 8 . 2 . 7 2 8 . . . 6 . . 1 . 6 . . 5 7 . . . 1 7 . . . 2 . 2 . . . 8 . . . . 7 6 . . . 4 . . . . 9 . . 3 . . . . 1 . . 9 . . . 8 . . . . . 6 . . . 5
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
645379812972815463813642579451793628239186754768524931596238147124957386387461295 #1 Extreme (22132) bf Brute Force: r5c8=5 Forcing Net Contradiction in c9 => r1c5<>5 r1c5=5 (r1c5<>9) (r1c5<>7 r1c6=7 r1c6<>9) (r4c5<>5 r4c5=9 r4c1<>9) (r2c5<>5) r2c6<>5 r2c1=5 r2c1<>9 r3c1=9 r1c3<>9 r1c8=9 r2c9<>9 r1c5=5 (r4c5<...
Extreme
sudoku_normal_extremely_hard_133
......6...25...4..69.4...58..9...5...86.5.2...4.....89........6..2.31..58....4.2.
438517692125896437697423158279148563386759214541362789914285376762931845853674921
sudoku_normal_extremely_hard_133
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . . . . . 6 . . . 2 5 . . . 4 . . 6 9 . 4 . . . 5 8 . . 9 . . . 5 . . . 8 6 . 5 . 2 . . . 4 . . . . . 8 9 . . . . . . . . 6 . . 2 . 3 1 . . 5 8 . . . . 4 . 2 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
438517692125896437697423158279148563386759214541362789914285376762931845853674921 #1 Extreme (14022) bf Hidden Single: r6c1=5 Hidden Single: r4c8=6 Hidden Single: r1c3=8 Hidden Single: r4c5=4 Hidden Single: r1c9=2 Hidden Single: r4c1=2 Hidden Single: r1c1=4 Hidden Single: r7c3=4 Hidden Single...
Extreme
sudoku_normal_extremely_hard_134
5....7......31.5..91.4.67..6.8...9.1...9..3....21....5.67...........3....8.7...39
526897413874312596913456728638275941451968372792134865367529184149683257285741639
sudoku_normal_extremely_hard_134
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
5 . . . . 7 . . . . . . 3 1 . 5 . . 9 1 . 4 . 6 7 . . 6 . 8 . . . 9 . 1 . . . 9 . . 3 . . . . 2 1 . . . . 5 . 6 7 . . . . . . . . . . . 3 . . . . 8 . 7 . . . 3 9
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
526897413874312596913456728638275941451968372792134865367529184149683257285741639 #1 Easy (420) Naked Single: r3c3=3 Hidden Single: r3c5=5 Hidden Single: r6c2=9 Hidden Single: r2c1=8 Hidden Single: r8c4=6 Hidden Single: r7c1=3 Hidden Single: r8c3=9 Hidden Single: r1c9=3 Hidden Single: r4c2=3 ...
Easy
sudoku_normal_extremely_hard_135
1.9..75........79.7.8..9..39...1..2..4..9.......8.3.5.......3.....63....8.2....71
129387564364521798758469213983715426541296837276843159695178342417632985832954671
sudoku_normal_extremely_hard_135
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
1 . 9 . . 7 5 . . . . . . . . 7 9 . 7 . 8 . . 9 . . 3 9 . . . 1 . . 2 . . 4 . . 9 . . . . . . . 8 . 3 . 5 . . . . . . . 3 . . . . . 6 3 . . . . 8 . 2 . . . . 7 1
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
129387564364521798758469213983715426541296837276843159695178342417632985832954671 #1 Easy (354) Hidden Single: r5c8=3 Hidden Single: r4c2=8 Hidden Single: r9c2=3 Hidden Single: r2c1=3 Hidden Single: r3c8=1 Hidden Single: r4c3=3 Hidden Single: r1c4=3 Hidden Single: r9c7=6 Naked Single: r4c7=4 ...
Easy
sudoku_normal_extremely_hard_136
..65..1...2......9....9.24.65.1....8..1......78..6.5......43....6......2..86..73.
936524187524718369817396245659137428341285976782469513275843691463971852198652734
sudoku_normal_extremely_hard_136
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . 6 5 . . 1 . . . 2 . . . . . . 9 . . . . 9 . 2 4 . 6 5 . 1 . . . . 8 . . 1 . . . . . . 7 8 . . 6 . 5 . . . . . . 4 3 . . . . 6 . . . . . . 2 . . 8 6 . . 7 3 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
936524187524718369817396245659137428341285976782469513275843691463971852198652734 #1 Extreme (36400) bf Brute Force: r5c6=5 Brute Force: r5c5=8 Brute Force: r5c7=9 Locked Candidates Type 1 (Pointing): 9 in b4 => r78c3<>9 Empty Rectangle: 3 in b5 (r24c7) => r2c4<>3 Forcing Chain Contradiction in r4 => ...
Extreme
sudoku_normal_extremely_hard_137
.3.4...2.1...9.5....7..2.......8..1.8......59..69..8....13...7.7...6.1...4...7..5
935418726162793584487652391293586417874231659516974832651349278729865143348127965
sudoku_normal_extremely_hard_137
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. 3 . 4 . . . 2 . 1 . . . 9 . 5 . . . . 7 . . 2 . . . . . . . 8 . . 1 . 8 . . . . . . 5 9 . . 6 9 . . 8 . . . . 1 3 . . . 7 . 7 . . . 6 . 1 . . . 4 . . . 7 . . 5
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
935418726162793584487652391293586417874231659516974832651349278729865143348127965 #1 Extreme (26792) bf Brute Force: r5c4=2 Finned Swordfish: 2 r268 c239 fr6c1 => r4c23<>2 Forcing Chain Contradiction in r1 => r7c7<>6 r7c7=6 r7c2<>6 r79c1=6 r1c1<>6 r7c7=6 r5c7<>6 r5c6=6 r1c6<>6 r7c7=6 r1c7<>6 r7c7=6 r9c...
Extreme
sudoku_normal_extremely_hard_138
9....471..719....3.5.........32..4..7....92...2.....5.6..79.....8.46.9.......8...
968354712271986543354172896893215467715649238426837159642791385587463921139528674
sudoku_normal_extremely_hard_138
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
9 . . . . 4 7 1 . . 7 1 9 . . . . 3 . 5 . . . . . . . . . 3 2 . . 4 . . 7 . . . . 9 2 . . . 2 . . . . . 5 . 6 . . 7 9 . . . . . 8 . 4 6 . 9 . . . . . . . 8 . . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
968354712271986543354172896893215467715649238426837159642791385587463921139528674 #1 Extreme (34122) bf Brute Force: r5c8=3 Brute Force: r5c5=4 Locked Candidates Type 2 (Claiming): 4 in c2 => r79c3,r9c1<>4 XYZ-Wing: 2/5/7 in r78c3,r8c8 => r8c1<>2 Discontinuous Nice Loop: 2 r2c8 -2- r8c8 -7- r8c3 =7= r9c3...
Extreme
sudoku_normal_extremely_hard_139
.2..4..6.5..73.4.......8..7...9...8.4...7.3.9.19........5.6....6..4.7..5.7.3..6..
728549163596731428143628957367914582452876319819253746935162874681497235274385691
sudoku_normal_extremely_hard_139
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. 2 . . 4 . . 6 . 5 . . 7 3 . 4 . . . . . . . 8 . . 7 . . . 9 . . . 8 . 4 . . . 7 . 3 . 9 . 1 9 . . . . . . . . 5 . 6 . . . . 6 . . 4 . 7 . . 5 . 7 . 3 . . 6 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
728549163596731428143628957367914582452876319819253746935162874681497235274385691 #1 Extreme (22024) bf Hidden Pair: 3,4 in r46c6 => r4c6<>1, r46c6<>2, r46c6<>5, r46c6<>6 Brute Force: r5c4=8 Hidden Single: r6c1=8 Hidden Single: r6c6=3 Naked Single: r4c6=4 Locked Candidates Type 1 (Pointing): 7 in b4 =...
Extreme
sudoku_normal_extremely_hard_140
..8....6.9..38...7.....58..2...3...6.1.4...2.3..12...96.........23.9.6...97.....2
158972463946381257732645891274539186819467325365128749681253974523794618497816532
sudoku_normal_extremely_hard_140
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . 8 . . . . 6 . 9 . . 3 8 . . . 7 . . . . . 5 8 . . 2 . . . 3 . . . 6 . 1 . 4 . . . 2 . 3 . . 1 2 . . . 9 6 . . . . . . . . . 2 3 . 9 . 6 . . . 9 7 . . . . . 2
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
158972463946381257732645891274539186819467325365128749681253974523794618497816532 #1 Extreme (33160) bf Brute Force: r5c5=6 Hidden Single: r4c4=5 Locked Candidates Type 1 (Pointing): 7 in b5 => r178c6<>7 Locked Candidates Type 1 (Pointing): 8 in b5 => r789c6<>8 Locked Candidates Type 1 (Pointing): 9 in b...
Extreme
sudoku_normal_extremely_hard_141
7..2..6....8.36.......7..5..7...2.45..9.....12...4.7..31.4....9.8.......6....34..
745281693928536174163974258876312945439765821251849736317428569584697312692153487
sudoku_normal_extremely_hard_141
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
7 . . 2 . . 6 . . . . 8 . 3 6 . . . . . . . 7 . . 5 . . 7 . . . 2 . 4 5 . . 9 . . . . . 1 2 . . . 4 . 7 . . 3 1 . 4 . . . . 9 . 8 . . . . . . . 6 . . . . 3 4 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
745281693928536174163974258876312945439765821251849736317428569584697312692153487 #1 Extreme (22156) bf Brute Force: r5c6=5 Hidden Single: r5c4=7 Turbot Fish: 5 r1c5 =5= r2c4 -5- r2c1 =5= r8c1 => r8c5<>5 Finned Swordfish: 5 r169 c235 fr9c4 => r7c5<>5 Forcing Chain Contradiction in r4 => r4c4<>8 r4c4=8 ...
Extreme
sudoku_normal_extremely_hard_142
.2.1...6.7.4.6..2....2..7...6..1.4..37..4.6....5.........4...3......8..9.4..2.1..
928174365714563928653289714862917453371845692495632871287491536136758249549326187
sudoku_normal_extremely_hard_142
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. 2 . 1 . . . 6 . 7 . 4 . 6 . . 2 . . . . 2 . . 7 . . . 6 . . 1 . 4 . . 3 7 . . 4 . 6 . . . . 5 . . . . . . . . . 4 . . . 3 . . . . . . 8 . . 9 . 4 . . 2 . 1 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
928174365714563928653289714862917453371845692495632871287491536136758249549326187 #1 Extreme (25816) bf Hidden Single: r6c1=4 Hidden Single: r8c8=4 Hidden Single: r7c6=1 Turbot Fish: 1 r2c9 =1= r2c2 -1- r6c2 =1= r5c3 => r5c9<>1 Brute Force: r5c8=9 Hidden Single: r5c3=1 Locked Candidates Type 1 (Poi...
Extreme
sudoku_normal_extremely_hard_143
1...8......9..76...5.2.....8..1......2..5......4..6..37......19.....43.8..3...7..
147689532239547681658231974875193246326458197914726853782365419561974328493812765
sudoku_normal_extremely_hard_143
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
1 . . . 8 . . . . . . 9 . . 7 6 . . . 5 . 2 . . . . . 8 . . 1 . . . . . . 2 . . 5 . . . . . . 4 . . 6 . . 3 7 . . . . . . 1 9 . . . . . 4 3 . 8 . . 3 . . . 7 . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
147689532239547681658231974875193246326458197914726853782365419561974328493812765 #1 Extreme (31762) bf Brute Force: r5c4=4 Finned X-Wing: 4 r17 c27 fr1c8 fr1c9 => r3c7<>4 Forcing Chain Contradiction in c1 => r8c4<>6 r8c4=6 r1c4<>6 r3c5=6 r3c1<>6 r8c4=6 r8c4<>7 r6c4=7 r6c4<>8 r5c6=8 r5c6<>3 r5c1=3 r5c1<>6 ...
Extreme
sudoku_normal_extremely_hard_144
2...6...419.8.4..........8.78.2..5.6....5.....4.7.6.2.....2...7..7.8.24....6.7..5
278963154195874632436512789783241596962358471541796328319425867657189243824637915
sudoku_normal_extremely_hard_144
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
2 . . . 6 . . . 4 1 9 . 8 . 4 . . . . . . . . . . 8 . 7 8 . 2 . . 5 . 6 . . . . 5 . . . . . 4 . 7 . 6 . 2 . . . . . 2 . . . 7 . . 7 . 8 . 2 4 . . . . 6 . 7 . . 5
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
278963154195874632436512789783241596962358471541796328319425867657189243824637915 #1 Extreme (15614) bf Hidden Single: r1c3=8 Hidden Single: r3c6=2 Hidden Single: r5c6=8 Hidden Single: r2c9=2 Hidden Single: r4c5=4 Hidden Single: r5c7=4 Hidden Single: r6c9=8 Hidden Single: r7c4=4 Hidden Single...
Extreme
sudoku_normal_extremely_hard_145
..8..6..32..3.......5.4..1....2..7...6.4..8..5.1.7..4.1...9...7..9...1.4.5.....9.
948126573216357489375948612894265731763419825521873946182594367639782154457631298
sudoku_normal_extremely_hard_145
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . 8 . . 6 . . 3 2 . . 3 . . . . . . . 5 . 4 . . 1 . . . . 2 . . 7 . . . 6 . 4 . . 8 . . 5 . 1 . 7 . . 4 . 1 . . . 9 . . . 7 . . 9 . . . 1 . 4 . 5 . . . . . 9 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
948126573216357489375948612894265731763419825521873946182594367639782154457631298 #1 Extreme (38294) bf Brute Force: r5c5=1 Hidden Single: r4c9=1 Forcing Net Contradiction in c8 => r7c6<>5 r7c6=5 (r8c6<>5 r8c8=5 r1c8<>5) (r4c6<>5) r5c6<>5 r4c5=5 r1c5<>5 r1c5=2 r1c8<>2 r1c8=7 r7c6=5 (r8c6<>5 r8c8=5 r2c8<>5)...
Extreme
sudoku_normal_extremely_hard_146
4..2..8.7..8.......3..8..6......6.......5....9..7..4.6..4.7.1.9.7.1....21...29...
496235817518697243732481965387946521641352798925718436264573189879164352153829674
sudoku_normal_extremely_hard_146
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
4 . . 2 . . 8 . 7 . . 8 . . . . . . . 3 . . 8 . . 6 . . . . . . 6 . . . . . . . 5 . . . . 9 . . 7 . . 4 . 6 . . 4 . 7 . 1 . 9 . 7 . 1 . . . . 2 1 . . . 2 9 . . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
496235817518697243732481965387946521641352798925718436264573189879164352153829674 #1 Extreme (42218) bf Hidden Single: r8c3=9 Empty Rectangle: 9 in b5 (r3c47) => r4c7<>9 Brute Force: r5c2=4 Brute Force: r5c1=6 Brute Force: r5c3=1 Locked Candidates Type 1 (Pointing): 7 in b4 => r4c78<>7 Naked Triple...
Extreme
sudoku_normal_extremely_hard_147
....4..1....9.27.....6.......6..3.....27..9..8......5..1..5...3..3..92..4......8.
978345612651982734324671598146593827532768941897124356219856473783419265465237189
sudoku_normal_extremely_hard_147
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . . . 4 . . 1 . . . . 9 . 2 7 . . . . . 6 . . . . . . . 6 . . 3 . . . . . 2 7 . . 9 . . 8 . . . . . . 5 . . 1 . . 5 . . . 3 . . 3 . . 9 2 . . 4 . . . . . . 8 .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
978345612651982734324671598146593827532768941897124356219856473783419265465237189 #1 Extreme (34946) bf Grouped Discontinuous Nice Loop: 5 r1c1 -5- r2c123 =5= r2c9 -5- r8c9 =5= r8c12 -5- r9c3 =5= r123c3 -5- r1c1 => r1c1<>5 Grouped Discontinuous Nice Loop: 5 r1c2 -5- r2c123 =5= r2c9 -5- r8c9 =5= r8c12 -5- r9c3 =5=...
Extreme
sudoku_normal_extremely_hard_148
6..72......5..6...7...9..46...6......529.4.......7295..6.5..4...49...13...7.4....
694725813315486279728391546971658324852934761436172958263519487549867132187243695
sudoku_normal_extremely_hard_148
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
6 . . 7 2 . . . . . . 5 . . 6 . . . 7 . . . 9 . . 4 6 . . . 6 . . . . . . 5 2 9 . 4 . . . . . . . 7 2 9 5 . . 6 . 5 . . 4 . . . 4 9 . . . 1 3 . . . 7 . 4 . . . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
694725813315486279728391546971658324852934761436172958263519487549867132187243695 #1 Extreme (27098) bf Hidden Single: r6c3=6 Hidden Single: r4c5=5 Hidden Single: r1c3=4 Hidden Single: r8c5=6 Hidden Single: r4c2=7 Hidden Single: r2c4=4 Hidden Single: r4c1=9 Hidden Single: r4c9=4 Hidden Single...
Extreme
sudoku_normal_extremely_hard_149
...7..19.....182...7.2.9.485........3.7...8...2...4..99.4.....1.......7..8.9.1...
832745196495618237671239548549863712367192854128574369954327681213486975786951423
sudoku_normal_extremely_hard_149
Each row, column, and 3×3 subgrid must contain all digits from 1 to 9 exactly once. Digits cannot be repeated within any row, column, or 3×3 subgrid.
None
9
9
. . . 7 . . 1 9 . . . . . 1 8 2 . . . 7 . 2 . 9 . 4 8 5 . . . . . . . . 3 . 7 . . . 8 . . . 2 . . . 4 . . 9 9 . 4 . . . . . 1 . . . . . . . 7 . . 8 . 9 . 1 . . .
Complete the sudoku board based on the rules and visual elements.
sudoku
sudoku_benchmark
extremely_hard
832745196495618237671239548549863712367192854128574369954327681213486975786951423 #1 Extreme (42008) bf Hidden Single: r2c9=7 Hidden Single: r9c1=7 Hidden Single: r7c8=8 Hidden Single: r8c7=9 Locked Candidates Type 1 (Pointing): 4 in b4 => r12c2<>4 Locked Candidates Type 2 (Claiming): 2 in r7 => r8c56...
Extreme