The object of the game is to blast a path through an asteroid field that your spaceship has stumbled into by using your unlimited supply of Photon Torpedoes (mouse to aim, X key or left-click to fire) and Neutron Bombs (Z key or Spacebar to launch) that destroy all asteroids in a single hit should you get swamped. You start with only 5 Neutron Bombs but get an extra one for each 50,000 points earned. You may only launch one at a times. For each Asteroid hit that you take you lose 5% shield strength. For each 5,000 points you earn you gain 1% back. Level 1 is dead easy. Only about 2 asteroids come at you per second and most will not hit your ship. Level 6 is pretty hard. You get 10 or more asteroids per second and many more of them are on a collision course. You'll need your Neutron Bombs and some rapid fire to avoid destruction! Level-ups occur every 100,000 points earned.