To pass each level you must collect points. To do this you can use one of three weapons, each with their own effect, on items as they pass by beneath your spaceship. However some items require a specific weapon to be used in order to gain its points. Along the way you'll also encounter hazards, such as enemies and stationary guns. Some can be destroyed, whilst others must be avoided. If you're hit to often you'll crash land and the game will end. Use the space bar to shoot and the arrow keys to move. To select a weapon, press 1-3 keys.