The "fifteen puzzle" or "slide puzzle" is a sort of Stock Puzzle where one has to arrange a set of scrambled numbers so that they are all shown in ascending order. One spot is always open, allowing pieces to be moved around, but it is designed in such a way that no piece can ever be removed from the board. More sadistic versions will be bigger than fifteen squares; these larger versions are called "n-puzzles", where n is the number of scrambled numbers (always a square number minus one). Examples of Fifteen Puzzle include:
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