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Sudoku Maker is a generator for Sudoku number puzzles. It uses a geneticalgorithm internally, so it can serve as an introduction to genetic algorithms. The generated Sudokus are usually very hard to solve -- good for getting rid of a Sudoku addiction.
Popular Game 15 implemented in Java. The most intersting part of the project is the geneticalgorithm which solving the puzzle. Play the game here: http://www.geocities.com/todordimitrovbalabanov/the15/