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.
I've worked on a custom map with a few friends and we really like how it looks and the things you have to do. So we decided to upload the map.
Exctract to steam/steamapps/common/alien swarm/swarm/addons