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Evil · Puzzle #579
3
8
2
5
4
4
6
1
5
2
7
9
6
5
8
7
7
3
4
1
7
5
9
8
"To know what you know and what you do not know — that is true knowledge." — Confucius
"To know what you know and what you do not know — that is true knowledge." — Confucius
After placing a digit, immediately check its row, column, and box for new naked singles.
After placing a digit, immediately check its row, column, and box for new naked singles.