PlaySudoku.us
Medium · Puzzle #128
7
6
2
6
8
9
8
9
4
7
4
9
8
5
2
1
7
4
6
5
1
7
6
1
8
9
4
1
5
2
3
1
7
9
8
"What is a proof? It is a demonstration that a statement is necessarily true — a guarantee that no exception can exist." — Henri Poincaré
"What is a proof? It is a demonstration that a statement is necessarily true — a guarantee that no exception can exist." — Henri Poincaré
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'.