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Hard · Puzzle #859
8
6
1
4
2
7
8
4
5
4
2
5
3
9
4
9
1
8
4
2
9
8
6
3
3
5
2
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.