Shoot down all the enemies in a level and move towards the exit to proceed to the next level. You need to plan your way to enemy base.

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.
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