PlaySudoku.us
Hard · Puzzle #873
2
4
5
7
3
5
7
6
9
6
3
1
2
8
4
9
2
7
9
1
6
5
2
5
9
8
8
2
3
6
"Mathematics is the door and key to the sciences." — Roger Bacon
"Mathematics is the door and key to the sciences." — Roger Bacon
Scan by digit rather than by cell: find everywhere '7' must go before switching to '8'.
Scan by digit rather than by cell: find everywhere '7' must go before switching to '8'.