Alien Swarm is a shooter game released in 2010 designed and developed by Valve. Alien Swarm can be described as a open source game and can be played on the following operating systems: Windows. Alien Swarm is also a multiplayer game.
“Alien Swarm thrusts players into an epic bug hunt featuring a unique blend of co-op play and squad-level tactics.” - Valve
Alien Swarm video
Alien Swarm Details