【實用解謎app】PuzzleDroid|最夯免費app-綠色工廠好玩App

The n-puzzle is known in various versions, including the 8 puzzle, the 15 puzzle, and with various names (Gem Puzzle, Boss Puzzle, Game of Fifteen, Mystic Square and many others). The object of the puzzle is to place the tiles in order by making sliding moves that use the empty space