Alien Swarm is a Free to Play, Co-op, Action PC game, developed by , available on Steam and published by .
Co-operative multiplayer game and complete code base available for free.
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Free to Play Co-op Action Multiplayer Online Co-Op Aliens Shooter Sci-fi Top-Down Top-Down Shooter Survival Third Person Class-Based PvE Team-Based Third-Person Shooter Moddable Singleplayer Strategy Adventure