PlaySudoku.us
Hard · Puzzle #220
2
5
1
6
4
1
4
3
2
9
4
3
4
9
8
1
5
6
3
7
4
9
1
7
6
3
5
"An expert is someone who has made all the mistakes which can be made in a very narrow field." — Niels Bohr
"An expert is someone who has made all the mistakes which can be made in a very narrow field." — Niels Bohr
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.