PlaySudoku.us
Easy · Puzzle #118
8
7
1
2
3
2
3
9
7
6
1
6
8
7
9
4
3
1
5
9
7
2
5
7
1
9
7
3
2
1
4
5
5
9
4
2
7
3
2
7
9
4
5
8
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.