![]() ![]() The game later received a fan-made update on April 20, 2017, titled Alien Swarm: Reactive Drop (or "Reactive Drop" for short). Developed as a side-project, it was released for free alongside both the source code and special SDK tools (including "TileGen", a special level creation system where builders can arrange prefabricated rooms similar to the MapMaker system from the Timesplitters series). A version for the Source engine was in development in 2005 before being discontinued, as the team behind the mod was later hired by Valve for work on several Source engine games. Similar to Killing Floor, the game was originally developed in May 2004 as a total conversion modification for Unreal Tournament 2004. As players gain experience points between missions, they unlock new weapons and items for use in their loadouts. Alien Swarm is a freeware sci-fi co-operative top-down shooter developed and released digitally by Valve for the PC (via Steam) on July 19, 2010.Īs a squad of four marines of the Interstellar Armed Forces, players must investigate a derelict colony on the planet Vereon XII that was overwhelmed by an alien infestation. ![]()
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