PlaySudoku.us
Medium · Puzzle #845
5
4
7
6
2
4
4
3
6
7
2
6
6
9
3
7
8
2
1
4
3
2
5
9
8
2
7
2
5
9
1
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.
"Somewhere, something incredible is waiting to be known." — Carl Sagan
"Somewhere, something incredible is waiting to be known." — Carl Sagan