The dinosaur has 13 teeth on its lower jaw. Push up its upper jaw, its mouth will stay open. Press down on one random tooth, the tooth will stay down and the mouth will stay open if the tooth is not the one that would switch on the biting down. Players could press the teeth one by one until the upper jaw bites down. Push up the upper jaw again, randomly ,one of the 13 teeth will be on the switch. It is ready to start a new game.