PlaySudoku.us
Easy · Puzzle #316
3
4
9
5
7
9
4
2
1
2
9
1
8
6
5
7
3
4
7
5
8
4
3
9
4
2
6
7
7
5
8
9
2
6
2
3
1
5
8
5
3
7
1
2
9
4
5
8
7
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.