PlaySudoku.us
Easy · Puzzle #110
6
2
5
9
4
1
8
1
2
8
4
9
5
7
1
3
9
8
6
7
3
2
8
1
5
9
1
5
6
7
9
3
4
2
3
9
7
8
6
5
9
2
4
3
4
7
8
5
2
1
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.
"As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality." — Albert Einstein
"As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality." — Albert Einstein