Alien Swarm is a futuristic first-person top-down shoot-em-up shooter computer game and Source SDK release developed by Valve Corporation. The game is a remake of the Alien Swarm mod for Unreal Tournament 2004, developed by the original team after they were hired by Valve. And now Valve is releasing Alien Swarm as free full version game, increasing the number of free games on Steam. Alien … Continue reading Download Alien Swarm Free Full Version Game on Steam