PlaySudoku.us
Expert · Puzzle #506
2
9
4
8
3
3
7
8
4
7
2
5
3
7
6
9
5
3
9
6
2
5
4
6
1
Look for digits that already appear 7 or 8 times on the board — they're the easiest to place last.
Look for digits that already appear 7 or 8 times on the board — they're the easiest to place last.
"Candidates must be mentally prepared for every new game as if it were the last." — Mikhail Botvinnik
"Candidates must be mentally prepared for every new game as if it were the last." — Mikhail Botvinnik