Game · FPS & shooters

Alien Swarm: Reactive Drop

A free-to-play top-down tactical co-op expansion on the Alien swarm game and Source SDK.

Free, with trade-offs
Windows
In-app purchases

Overview

Alien Swarm: Reactive Drop is a shooter, available on Windows.

Gameplay elements described in its FreeToGame listing: co-op play and leaderboards.

Minimum requirements stated in its FreeToGame listing: Windows XP, 2 GB of RAM and 10 GB of disk space.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information

“A free-to-play top-down tactical co-op expansion on the Alien swarm game and Source SDK.” — FreeToGame, 10 November 2026
“Shooter game.” — FreeToGame, 10 November 2026
“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.” — FreeToGame, 10 November 2026

At a glance

Alien Swarm: Reactive Drop is free, with trade-offs (account, ads, data or attribution) detailed below.

Its licence could not be established at the source: check the terms on the official website.

“Free-to-play” model: the base game is free; optional purchases may exist.

Weaknesses

Only available on Windows

Sources and checks

Facts collected from Official Steam page (limits, free status, platforms) — 6 November 2026
Last technical check: 6 November 2026
Description from freetogame.com — FreeToGame.com (attribution)

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