Use the "start" button to jumble the picture, then rearrange the pieces on the board by clicking on the tile you want to move, using the blank square to slide the new piece along, up or down.
The aim is to end up with the puzzle back to where it started, as shown on the left. This game is not as easy as it seems! Maybe it is not always possible to solve? If you find this version is too easy, you can
