Fifteen Puzzles are known by many names. Boss Puzzles, Gem Puzzles, Game of Fifteen Puzzles, or Mystic Squares. A 15 puzzle is a square puzzle consisting of 15 peices and one emply square. You have to use the empty square to move around all of the pieces until you sort out the picture on the puzzle. Do you think you can solve such a puzzle? Give it a try in one of our online Game of Fifteen games!