Move Tiles

Move Tiles is an implementation of the n-puzzle game with the aim of rearranging all of the numbered tiles into the right order, leaving the empty tile at the very last position. Pressing the "Start" button would scramble the board, and pressing any tile after that would initialize the timer.
It is interesting to note that finding the shortest solution of the general n-puzzle has been proved to be NP-complete (Ratner and Warmuth, 1990).