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.
Nest is a one mission campaign used in Alien Swarm: Reactive Drop mod(RD) for showcasing the power of the "Red drones". In RD these drones can't be ignited, frozen, electro stunned and have a significant health boost which makes map quite challenging. This map, however, can be used in Alien Swarm too, but scary Red drones will be usual drones, just red colored.
I play this map on ,,vanilla" Alien Swarm and it really good campaign!