As promised, Valve has released top-down co-op shooter Alien Swarm on Steam, free of charge. Have fun! https://kotaku.com/valve-unleashes-an-alien-swarm-on-steam ...
The teams must work together to build the Prismatic Core in the Space Anomaly by completing three categories of missions called Purge, Restoration, and Sabotage, with the eventual goal of taking down ...
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