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Alien Swarm: Reactive Drop

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About Alien Swarm: Reactive Drop

Alien Swarm: Reactive Drop is a free-to-play top-down tactical co-op expansion on the Alien swarm game and Source SDK developed by a group of designers at Valve who were hired from the MOD community. Reactive drop no longer grants players access to the Source SDK, however it does offer expanded co-op, with up to 8 players, Steam Workshop support, four PvP modes, a single player mode, and new aliens, weapons, achievements and more.

The game sends players on a bug hunt and is a blend of co-op and squad level gameplay. Players team up with friends to form a squad made of IAF Marine classes and use a selection of unlockable weapons featuring a wide variety of loadout configurations to battle aliens in an offworld colony.

Reactive Drop is spectator friendly and features leaderboards as well as the ability for spectators to see hacking minigames and mouse movements in real time. It is available via Steam.

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Additional Information

Please note this free-to-play game may or may not offer optional in-game purchases.


Alien Swarm: Reactive Drop

Reactive Drop
Reactive Drop
Release Date
April 20, 2017
Windows (Client)

Alien Swarm: Reactive Drop Screenshots

Minimum System Requirements (Windows)


Windows XP or above


2 GB


10 GB


Pentium 4 3.0GHz


DirectX 9 compatible card with 128 MB, Shader model 2.0, ATI X800, NVidia 6600 or better

Additional Notes

Specifications may change during development

All material on this page is copyrighted by ©Reactive Drop and their respective licensors. All other trademarks are the property of their respective owners.

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