PlaySudoku.us
Easy · Puzzle #37
8
3
7
1
9
2
5
4
6
9
5
8
3
5
9
8
3
1
2
8
9
3
4
6
3
5
9
1
5
1
8
2
7
2
5
9
8
4
1
3
5
8
6
2
9
9
3
1
8
6
The hardest Sudoku puzzles require techniques equivalent to propositional logic — the same foundation used in computer proofs.
The hardest Sudoku puzzles require techniques equivalent to propositional logic — the same foundation used in computer proofs.
The hardest Sudoku puzzles require techniques equivalent to propositional logic — the same foundation used in computer proofs.
The hardest Sudoku puzzles require techniques equivalent to propositional logic — the same foundation used in computer proofs.