PlaySudoku.us
Easy · Puzzle #575
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"Without music, life would be a mistake." — Friedrich Nietzsche
"Without music, life would be a mistake." — Friedrich Nietzsche
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.