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Sudoku Maker is a generator for Sudoku number puzzles. It uses a genetic algorithm 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.
Guessing Game 6.0. This game operates in GUI. There are now four difficulty levels: Easy, Medium, Hard, and Suicide. To give you an idea of perspective, I can beat Easy in about three minutes, and I've never beat the first level of Suicide.