PlaySudoku.us
Medium · Puzzle #420
3
1
2
9
6
2
3
1
7
2
5
3
9
4
5
3
9
8
7
3
6
2
7
4
3
3
4
5
2
4
5
6
3
7
9
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.