The SuDoKu-Cracker only creates puzzles with a "unique solution". The built-in Sudoku-generator has six different levels of difficulty and can generate many (millions) different puzzles. All puzzles can be printed, saved and opened again. With the SuDoKu-Cracker you can create your own puzzles. All puzzles can be solved with the SuDoKu-Cracker. The program is fast, efficient and returns accurate solutions for all this puzzles.