PlaySudoku.us
Hard · Puzzle #728
1
9
5
5
9
1
2
7
8
5
7
3
6
2
5
7
8
5
6
8
2
6
2
5
2
4
8
6
3
7
"Chess demands total concentration." — Bobby Fischer
"Chess demands total concentration." — Bobby Fischer
Check columns before rows — columns are often harder to complete and contain more useful constraints.
Check columns before rows — columns are often harder to complete and contain more useful constraints.