About This Game
Alien Swarm: Reactive Drop extends Alien Swarm, bringing more of everything: maps, aliens, game modes, guns... And most importantly Steam Workshop support.
Tactical, 4 player or 8 player co-op action game 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
Single-player: Play with improved bots on all our official maps
New Aliens: HL2 antlion guards and more
New Weapons: Desert Eagle, Devastator, Combat Rifle and more
Over 100 Steam achievements

Minimum:OS: Windows® XP or above
Processor: Pentium 4 3.0GHz
Memory: 2 GB RAM
Graphics: DirectX 9 compatible video card with 128 MB, Shader model 2.0. ATI X800, NVidia 6600 or better
DirectX: Version 9.0
Storage: 10 GB available space
Sound Card: DirectX 9.0c compatible sound card
Recommended:OS: Windows® XP or above
Processor: Intel core 2 duo 2.4GHz
Memory: 4 GB RAM
Graphics: DirectX 9 compatible video card with 128 MB, Shader model 2.0. ATI X800, NVidia 6600 or better
DirectX: Version 9.0c
Network: Broadband Internet connection
Storage: 10 GB available space
Sound Card: DirectX 9.0c compatible sound card