NES: 15

NES15 is an implementation of the classic Fifteen Puzzle for the Nintendo Entertainment System. The fifteen puzzle consists of a frame of numbered square tiles in random order with one tile missing. The objective of the puzzle is to place the tiles in order by sliding them into the empty position. If you become frustrated trying to solve the puzzle, you can use an auto-solver that allows you to watch it being solved. While the auto-solver does not always make the least amount of moves needed to solve the puzzle, it should always at least solve it. After the puzzle has been completed by either you or the auto-solver, press either A or B button, and a new puzzle will be generated.