Alien Swarm

Co-operative multiplayer game and complete code base available for free.

Developer: Valve.

Tags: Solo · Co-op, Free to Play, Action, Aliens.

Steam reviews: Very Positive (95% of 21,274).

Price: Free to play on Steam.

Released 2010-07-19.

Last updated 2020-08-18.

Alien Swarm on Game Goose · Steam store page

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