You're a robot flying through the universe and you have to shoot down the other robots before they shoot you down! Be careful your health diminishes quickly. Destroy robots, and collect new weapons as you progress.

In Quake II, the brutal Strogg attacked Earth, looking for fresh ways to re-supply their cyber-organic army. A lone marine broke through their defenses and defeated their leader, the Makron. The Strogg built a new Makron, however, and in Quake 4, you must join the invasion of the Strogg homeworld, where humanity’s only hope lies in your ability to access the highly-fortified structure containing the Nexus Core. There, you can disrupt all Strogg communications and give the marines the upper hand.