PlaySudoku.us
Easy · Puzzle #352
7
3
4
1
8
8
5
3
1
6
4
6
2
8
3
9
5
6
3
2
9
4
3
4
5
9
8
8
9
3
1
5
9
2
5
2
6
8
4
1
6
1
2
3
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.