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Medium · Puzzle #42
7
1
5
4
2
7
9
1
5
7
1
4
9
6
7
9
5
6
4
2
9
6
7
2
1
9
3
8
7
7
5
6
4
9
3
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.