When you first open 15 the pieces will be in order from 1-15 and then it automatically shuffles the pieces so they are randomly placed. (No, the game is not broken and moving on it’s own…you just have to wait!! Unlike some people who are impatient and thought it was broken!! That would be me.) Once the pieces are in their random order you can tilt the iPhone to move the pieces where you would like them. The point of the game is to get them back in order from 1-15. You do have to be careful because the game is very sensitive and might move more pieces than you would like it to. Overall, a very well designed and challenging game. Here are some screenshots: