Select an image from your photo gallery and play the game. The image is cut to pieces (9, 25, 49 or 100 pieces, depending of the chosen complexity) and you have to drag and drop them into their right place. If you get the right spot for each piece it sticks to that spot.
The first play of the game has only 9 (3x3) pieces. When you finish the game you can either choose another image or you can increase the complexity (5x5, 7x7 or 10x10 pieces).
Caution: This game can become addictive if you have enough images to play with.