PlaySudoku.us
Hard · Puzzle #298
5
4
6
1
9
1
9
2
4
5
1
5
3
1
6
8
9
4
8
9
7
8
3
2
9
8
6
1
"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.