Alien Swarm: Reactive Drop

Alien Swarm: Reactive Drop expands Alien Swarm with new maps, aliens, game modes and weapons. It is a top-down tactical co-op game for up to eight players, with co-operative campaigns, challenges, PvP modes and single-player play with improved bots.

Game modes

Challenges modify the game, much like Mutations in Left 4 Dead 2. PvP includes Deathmatch, Gun Game, Instagib and Team Deathmatch. In single-player, you can play all official maps with improved bots.

Maps and weapons

New aliens include Half-Life 2 antlion guards and others. New weapons include the Bulldog, Devastator and Combat Rifle. Steam Workshop support lets the community create maps and challenges.

Competition and spectating

The game has over 100 Steam achievements and leaderboards where you can compete with friends for the fastest mission completion. Improved spectating shows hacking minigames and mouse movements in real time.