Alien Swarm: Reactive Drop

Free top-down alien shooter with classes and eight-player co-op

Reactive Drop Team · Released Apr 20, 2017

Reviews: Very Positive; 95% of 24K
Recent reviews: Very Positive; 88% of 79 in 30 days
Playing now: 108; right now
Steam Deck: Unsupported
Last update: 5 months ago; Apr 20, 2026

What is Alien Swarm: Reactive Drop?

This top-down, class-based shooter follows a team fighting aliens across campaign missions. You use weapons to clear mission objectives with other players, play solo with bots, or compete in PvP matches.

For you if...

+you want tactical co-op missions with a group
+you like replaying missions with different tactics and weapons
+you want community maps and custom challenges

Not for you if...

−you dislike mission-based shooting that can feel repetitive
−you prefer cooperative missions without required team roles

What players say

95% of 23,812 reviews are positive · 88% of 79 in the last 30 days

Players praise the free co-op, especially with friends, and the variety added by weapons and community maps. Some find the missions repetitive or dislike how certain objectives require specific classes; others report problems with AI teammates.

Screenshots and trailer

Alien Swarm: Reactive Drop system requirements

As published by the developer.

Minimum

OS: Windows® XP or above
Processor: Pentium 4 or newer
Graphics: DirectX 9 compatible video card with 128 MB, Shader model 2.0b. ATI X800, NVidia 6600 or better
Memory: 2 GB RAM
Storage: 7 GB available space
DirectX: Version 9.0b
Notes: Disk space requirement depends on installed Workshop addons.

PC version details

DRM, required accounts, controller support and Steam features.

DRM: None declared on Steam
Controller: Full controller support
Platforms: Windows
Achievements: 198
Steam features: Workshop, Cloud saves, Family Sharing

Steam Deck: Unsupported

Not supported on SteamOS

Multiplayer and co-op

Languages

Full audio: English. Text only: French, Italian, German, Spanish - Spain, Korean, Portuguese - Portugal, Russian, Simplified Chinese, Traditional Chinese, Ukrainian, Vietnamese, Japanese, Portuguese - Brazil.