PlaySudoku.us
Medium · Puzzle #687
4
3
8
7
3
1
6
3
4
5
2
8
6
3
7
5
4
7
8
9
6
1
3
1
2
9
6
8
5
4
8
3
"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'.