Use the mouse to move the rockit to avoid the astaroids. You can press the space bar to shoot a blaster, and that will make all the asteroids disappear, but then they will appear again. But you have a certain amount of blasters and this is displayed in the top left of the screen. If you run out of blasters and you want to shoot a blaster, nothing will happen. If you touch a ball, your number of blasters goes up by 2.
