PlaySudoku.us
Expert · Puzzle #408
3
5
1
8
8
9
3
6
5
1
7
8
3
2
6
6
1
8
2
5
6
7
5
9
2
3
"What one man calls God, another calls the laws of physics." — Nikola Tesla
"What one man calls God, another calls the laws of physics." — Nikola Tesla
Set theory provides the formal foundation for Sudoku's rules: each digit must appear exactly once per set.
Set theory provides the formal foundation for Sudoku's rules: each digit must appear exactly once per set.