Upon opening the game application, you will see the start menu. A swarm of enemies spaceships and asteroids will reign down from the top of your screen. When you show the tracker in front of the camera the shark will appear and start shooting at the enemies immediately. The shark moves with the tracker you can rotate the shark diagonally to shoot enemies on either side of the screen. Or you can move the tracker left or right to make the shark go to either side of the screen. The enemies will come down in waves of 90 and their are 20 waves total. The tracker will be included in the gallery. YOU MUST USE THE TRACKER FOR THIS APP.