Alien Swarm: Reactive Drop

Alien Swarm: Reactive Drop extends Alien Swarm, bringing more of everything: maps, aliens, game modes, guns... And most importantly Steam Workshop support.

                            * Tactical co-op for up to 8 players with a top-down perspective  

                            * Steam Workshop support for community maps and challenges  

                            * New co-operative campaigns  

                            * Challenges: Modifications of the game, just like Mutations in Left 4 Dead 2  

                            * PvP: Deathmatch, Gun Game, Instagib, and Team Deathmatch  

                            * Singleplayer: Play with improved bots on all our official maps  

                            * New Aliens: HL2 antlion guards and more  

                            * New Weapons: Bulldog, Devastator, and Combat Rifle, with more to come  

                            * Over 100 Steam achievements  

                            * Leaderboards: compete with your friends for the fastest mission completion  

                            * Improved spectating: see hacking minigames and mouse movements in real time