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Alien Swarm

Valve · 19 Jul, 2010
Free to Play
Very Positive (21,635 reviews)
Estimated owners (SteamSpy): 2000000 - 5000000
👥 20 playing right now
Co-operative multiplayer game and complete code base available for free.
ActionFree To PlaySingle-playerMulti-playerCo-opSteam AchievementsCaptions availableCamera ComfortColor AlternativesCustom Volume Controls
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