Alien Swarm

Alien Swarm 1.0.0.1

Free
Alien Swarm is a game and Source SDK release from a group of talented designers
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2.3  (4 votes)
7.1.0.9 (See all)

Alien Swarm is a game and Source SDK release from a group of talented designers at Valve who were hired from the Mod community. Available free of charge, the game thrusts players into 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.

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