PlaySudoku.us
Hard · Puzzle #679
6
1
8
2
7
8
7
9
2
3
4
9
8
3
1
9
4
7
6
9
7
1
6
2
7
1
8
6
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.