Alien Swarm is one of the first Free-To-Play Source games in Steam. Play as several solider classes in a co-op campaign and obliterate the alien swarms by completing objectives and using brutal weapons.
Reactive Drop adds new campaigns, aliens, weapons, game modes and improved single player. Now you can slay aliens with 8 players in online or offline co-op. Oh, and did I mention that its still FREE?
Follow my step-by-step guide on installing, configuring and optimizing Alien Swarm: Reactive Drop in Linux with PlayOnLinux.
Note: This guide applies to the Steam version of Alien Swarm: Reactive Drop.
Tips & Specs:
Try SteamPlay before using this guide as Valve now uses a fork of Wine called Proton and should run most Windows games.
To learn more about PlayOnLinux and Wine configuration, see the online manual...