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Hard · Puzzle #598
8
9
1
4
7
2
6
7
2
1
3
6
2
1
3
5
3
4
2
3
5
6
8
4
9
9
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.