Alien Swarm Summary

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Alien Swarm free on Steam today

Alien Swarm free on Steam today

Once an Unreal Tournament 2004 mod, now Alien Swarm stands on its own legs thanks to Valve's Source engine and it's releasing for free, today.

It'll go live on Steam from the mod's developers, Black Cat Games, who are now Valve employees. It's a top-down co-op shooter with aliens!

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