You are sitting on a stool and zombies are trying to kill you in the real world (you must allow the app access to the camera so it can show the zombies). You have to kill them before they get to you. When your health bar depletes completely, you die. This might not work on some tablets because it currently requires the use of the gyroscope and doesn't work with an accelerometer. I am planning on updating that in the future. This is still in beta so expect errors.