PlaySudoku.us
Medium · Puzzle #240
4
5
5
8
3
9
6
4
7
9
6
2
5
8
1
9
2
5
7
3
9
2
4
7
2
3
1
7
5
8
6
1
9
4
5
9
7
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.