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Hard · Puzzle #697
6
3
9
7
4
6
8
1
9
6
5
1
4
5
8
4
5
2
8
4
7
7
4
7
3
1
5
9
Work the most constrained areas first — rows, columns, or boxes that already have the most filled digits.
Work the most constrained areas first — rows, columns, or boxes that already have the most filled digits.
Work the most constrained areas first — rows, columns, or boxes that already have the most filled digits.
Work the most constrained areas first — rows, columns, or boxes that already have the most filled digits.