Use the keyboard controls described below to maneuver your ship, destroying
as many asteroids as you can while avoiding collision with them. Also watch
for the flying saucers armed with guided missles.
If you warp into hyperspace, your ship will momentarily disappear then
reappear on another part of the screen, gradually fading in. During this
time the ship is invunerable. Likewise, when your ship is destroyed, a new
one will appear in the center of the screen. You can still maneuver and fire
during this time so if you are in imminent danger, you have a couple of
seconds to get out of it.