The Fifteen puzzle / 15-puzzle (also called Gem Puzzle, BossPuzzle, Game of Fifteen, Mystic Square and many others) is asliding puzzle that consists of a frame of numbered square tiles inrandom order with one tile missing. your objective is arrange thenumber / image in correct order. in this game : - play normalclassic fifteen puzzle - play challenge mode - photo puzzle /picture puzzle Finish 8 challenge !