PlaySudoku.us
Hard · Puzzle #741
6
2
9
7
6
5
7
3
8
5
2
4
1
3
9
1
4
8
6
9
8
2
2
3
7
4
Before using pencil marks, see how far you can get on a hard puzzle with pure mental tracking.
Before using pencil marks, see how far you can get on a hard puzzle with pure mental tracking.
"A theory that is not refutable by any conceivable event is non-scientific." — Karl Popper
"A theory that is not refutable by any conceivable event is non-scientific." — Karl Popper