PlaySudoku.us
Medium · Puzzle #222
6
7
3
4
2
3
1
3
6
9
8
5
7
1
9
8
6
1
3
9
7
4
2
1
4
8
9
7
5
2
2
6
8
5
1
3
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.