一个拼图

We are going to create a pane; and then we are going to divide the pane into a 16 blocks, 1 block will be blank. The scrambled image fits in 15 remaining blocks. The users will be provided with a few pictures to begin with. They should also be able to upload any picture files if they get bored with the given pictures. There will be a change image button and a replay button which scrambles the image in a random order. There will be an interactive tutorial to help new players. The user should also be able to choose the difficulty of the game. This difficulty will be determined by the number of moves a player is allowed to solve the puzzle.