Players fight online in team based combat in a war of aliens against humans.

While the humans are equipped with weapons that they use to exterminate the alien presence, the aliens have only their pincers and a few special attacks, such as poison gas, and ranged electrical and projectile attacks. Players do not spawn at random points in the map; instead, each map has default spawn points and both teams are capable of moving them wherever they please. Both teams have other buildings that round out their base, such as machinegun turrets for the humans and barricades for the aliens. Either team wins by destroying the opposing team's spawn points and killing any remaining members of that team before they are able to build any more spawn points or the game timer ends.

This package contains extra maps.