An epic bug hunt featuring a unique blend of co-op play and squad-level tactics. With your friends, form a squad of four distinct IAF Marine classes. Plan your attack using an unlockable arsenal of weapons with countless loadout configurations against a wide variety of aliens. Blaze your way through an overrun, off-world colony, eradicating the alien infestation in environments ranging from the icy planet's surface, to a subterranean lava-flooded mining facility.
Replace Vegas with Flynn from the Alien Swarm mod for Unreal Tournament 2004.
To install extract the .zip file to /Steam/steamapps/common/Alien Swarm/addons and play!
(Keep in mind this manual install works for RD as well)