PlaySudoku.us
Medium · Puzzle #321
2
7
1
8
4
9
6
2
9
2
5
4
7
6
2
8
5
9
9
2
3
5
4
7
8
1
6
2
6
4
1
2
2
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.