PlaySudoku.us
Easy · Puzzle #235
7
2
3
4
5
6
9
8
4
9
6
5
3
7
5
8
6
7
3
9
1
3
5
7
9
3
2
9
4
5
1
2
8
6
9
8
7
5
6
8
1
4
3
3
6
2
8
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.