Alien Swarm: Reactive Drop
|This mod is available on Steam.|
Enter steam://run/563560 in your address bar to play.
You can also enter steam://store/563560 or visit the store to download this game.
Alien Swarm: Reactive Drop is a standalone mod for Alien Swarm which extends the original game, bringing more maps, campaigns, aliens, game modes, guns, and more. It also has Steam Workshop support.