Fly through space and shoot at the rocket ships to score points. Every rocket ship will get you 500 points. Get extra points by collecting the bonus point balls. Avoid the meteors otherwise you will loose a life.
Use the mouse to fly around, press the left mouse button to shoot.
A context menu should be shown when right-clicking or, on touch devices, long-pressing in the game. This menu especially allows to play in full screen and control the volume.