TheGameofFifteen(alsocalled15-puzzle,GemPuzzle,BossPuzzle,MysticSquareandmanyothers)isaslidingpuzzlethatconsistsofaframeofnumberedsquaretilesinrandomorderwithonetilemissing.
Thepuzzlealsoexistsinothersizes,particularlythesmaller8-puzzle.
Theobjectofthepuzzleistoplacethetilesinorderfromfirsttolasttilebymovingthetilenexttotheemptyspaceintoit.
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