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Hard · Puzzle #499
1
8
7
5
3
7
4
6
3
9
5
8
3
9
1
4
2
9
6
2
1
5
3
8
2
3
7
1
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.