Space Trek is a vertical shoot-'em-up similar to many on the market at the time. Players control a space ship and can move anywhere on screen but can only fire upwards at enemies. There is also a button to temporarily give the ship a protective barrier. There are several rounds of gameplay all with slightly different aesthetics.
Space Trek is thought to have been a predecessor to SDI.
This article needs a list of production credits, either from the game itself, a manual, or other reliable source.