3
6
9
7
8
4
5
8
6
6
4
8
1
4
5
3
2
8
2
5
8
1
2
4
6
7
4
8
5
1
9
2
6
5
8
"Let the future tell the truth, and evaluate each one according to his work and accomplishments." — Nikola Tesla
"Let the future tell the truth, and evaluate each one according to his work and accomplishments." — Nikola Tesla
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.