PlaySudoku.us
Evil · Puzzle #806
5
2
8
3
6
5
6
3
1
7
3
2
7
6
8
5
8
9
7
4
2
1
2
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.
"You don't play against opponents. You play against the game of basketball." — Bobby Knight
"You don't play against opponents. You play against the game of basketball." — Bobby Knight