PlaySudoku.us
Hard · Puzzle #182
8
4
1
6
7
5
3
7
7
2
1
2
8
3
8
1
6
9
7
4
8
9
3
9
4
7
"The measure of who we are is what we do with what we have." — Vince Lombardi
"The measure of who we are is what we do with what we have." — Vince Lombardi
Donald Knuth's "Algorithm X" with dancing links solves exact cover problems — of which Sudoku is a special case.
Donald Knuth's "Algorithm X" with dancing links solves exact cover problems — of which Sudoku is a special case.