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Expert · Puzzle #686
9
6
7
8
6
3
1
7
5
9
4
3
6
1
2
4
6
9
8
7
2
8
4
3
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'.
"Remember to look up at the stars and not down at your feet." — Stephen Hawking
"Remember to look up at the stars and not down at your feet." — Stephen Hawking