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Expert · Puzzle #570
5
8
6
2
7
6
3
9
7
9
1
7
5
4
9
1
4
3
8
5
6
8
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