PlaySudoku.us
Medium · Puzzle #501
3
4
7
8
5
4
9
2
4
7
3
5
8
8
6
5
2
2
3
1
6
1
3
4
5
9
2
2
1
7
2
6
8
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.