PlaySudoku.us
Hard · Puzzle #991
7
3
7
9
2
5
3
8
6
7
3
8
1
1
3
7
4
2
2
3
5
6
8
6
1
9
7
8
5
2
9
Before using pencil marks, see how far you can get with pure logic and mental candidate tracking.
Before using pencil marks, see how far you can get with pure logic and mental candidate tracking.
Before using pencil marks, see how far you can get with pure logic and mental candidate tracking.
Before using pencil marks, see how far you can get with pure logic and mental candidate tracking.