PlaySudoku.us
Hard · Puzzle #314
2
8
9
4
9
8
2
7
9
1
3
8
7
9
8
2
3
4
6
1
8
4
3
6
8
4
2
3
7
"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'.