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Alien Swarm is a free top-down shoot-em-up game by Valve. It is a remake of the Alien Swarm mod for Unreal Tournement 2004, and was developed by the same team who were hired by valve. The game can be downloaded for free on Steam.
- Developer: Valve
- Publisher: Valve
- Platforms: PC
- Release Date: July 19, 2010
- Genre: Top-down, 3D Shoot-em-up