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This is an implementation of Donald Knuth's Algorithm X ("dancing links"). This is primarily a sudoku generator and solver, though it can be used to solve other exact cover problems.
Very fast and easy to use Java tool for solving and generating Sudoku puzzles. By using Donald Knuths exact cover algorithmus it can not only solve or create the usual 9x9 but also 4x4, 16x16 or even bigger Sudokus in a very efficient way.