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Alien Swarm: Reactive Drop

Alien Swarm: Reactive Drop

Co-operative top-down shooter game available for free. An epic bug hunt featuring a unique blend of co-op play and squad-level tactics.

Released Apr 20, 2017 Developer Reactive Drop Team Platforms Windows Twin Stick ShooterPvETop-Down ShooterCo-opClass-Based
View on Steam ↗ Free (US · as of 2026-07-26)

What players say

Steam review score and the most-helpful voices, which may include critical ones. Data as of 2026-05-20.

94.9%positive22,649 reviews

What reviewers agree on

Praised
Criticised
Bar length = how many of the 102 reviews raise the point Select a point to see the exact counts and what reviewers wrote.

Counted across 102 English reviews, sampled to match this game's 94.9% positive rating · as of 2026-05-20

Recommended · 7 found this helpful

“Free multiplayer coop game for up to 8 players. That should be enough of an advertisement.”

— a player, Steam review · 4 hrs played
Recommended · 7 found this helpful

“A solid free game to enjoy with friends. Get a group together and enjoy blasting aliens away.”

— a player, Steam review · 1 hrs played
Recommended · 6 found this helpful

“There's like aliens in this game it's so easy to get swarmed. You have to be very reactive so you don't drop dead.”

— a player, Steam review · 8 hrs played
Read more reviews ↗

Player activity

Monthly average concurrent players. Live count fetched 2026-07-11 12:41 UTC · history via SteamCharts.

286playing at last check
28624-hour peak
9,335all-time peak
0 1k 2k 2017 2019 2021 2023 2025 1.8k avg · May 2017

Achievement stats

Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-07-25.

198achievements
1.3%median completion
0.2%rarest: Stowaway Speedrun
67.5% of players 47.9% of players 38.0% of players 27.5% of players 22.7% of players 18.9% of players 15.6% of players 13.4% of players 12.5% of players 11.1% of players 9.4% of players 7.7% of players 6.3% of players 5.2% of players 4.9% of players 4.2% of players 4.1% of players 3.7% of players 3.4% of players 3.2% of players 2.8% of players 2.7% of players 2.3% of players 2.2% of players 2.0% of players 1.9% of players 1.8% of players 1.6% of players 1.5% of players 1.5% of players 1.4% of players 1.4% of players 1.3% of players 1.3% of players 1.3% of players 1.2% of players 1.2% of players 1.2% of players 1.2% of players 1.2% of players 1.2% of players 1.1% of players 1.1% of players 1.1% of players 1.1% of players 1.1% of players 1.1% of players 1.1% of players 1.1% of players 1.1% of players 1.1% of players 1.0% of players 0.7% of players 0.6% of players 0.5% of players 0.4% of players 0.4% of players 0.4% of players 0.3% of players 0.3% of players 67.5% 0% most earned rarest
Almost everyone has
67.5%Technician Secured — Finish a mission without the tech getting killed.
54.2%Protect the Tech — Guard the squad's tech so that he takes no damage during the hack.
52.2%Quick Load — Successfully perform a fast reload.
Rarest badges of honor
0.2%Stowaway Speedrun — Complete Stowaway within 1:15 on Normal difficulty or harder without any marines dying.
0.2%Silent Station Speedrun — Complete Silent Station within 4:50 on Normal difficulty or harder without any marines dying.
0.2%Operation Sandstorm Speedrun — Complete Operation Sandstorm within 3:15 on Normal difficulty or harder without any marines dying.

Price tracking

US-region pricing (USD), sampled twice daily by our own tracker since 2026-07-11. Steam prices vary by region — always confirm your local price on Steam.

Freecurrent · sampled 2026-07-26 08:39 UTC
Freelowest since tracking began2026-07-11

Latest official news

Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.

Apr 20, 2026
AS:RD Update - April 20, 2026 "Going Up"

It's time once again for Alien Swarm: Reactive Drop's birthday. We're having a smaller one this year since a lot of our core contributors have been busy with other projects, but we've still got a lot

Feb 06, 2026
Coming Soon: Steam PvP Fest 2026

Every year, Valentines day is a time to be with friends and loved ones and reflect on your friendship and love. Well, not this year! In 2026, it's all about having simulated gun fights with friends an

Nov 01, 2025
AS:RD Update - November 1, 2025 "Cone of Fire"

Highlights Added a SynTek Residential themed main menu background. The camera feeds that display behind briefing have less static and are less distracting. Many guns are now more accurate while crouch

Sep 20, 2025
Alien Swarm: Reactive Drop Hotfix - September 20, 2025

A minor update has been released for Alien Swarm: Reactive Drop. Fixed a client crash in the Traitors game mode. Added a note in the Swarmopedia about the IAF Medical SMG's increased accuracy while cr

Sep 03, 2025
Alien Swarm: Reactive Drop Hotfix - September 3, 2025

Fixed black bars appearing on the sides of the screen for screen resolutions with an aspect ratio wider than 16:9.Fixed traitor players showing as having 99 player kills in the scoreboard.Fixed buzzer

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From our knowledge graph — ranked by shared traits, not a black box. Each card says why it's here.

Alien Swarm Alien Swarm 94.7% · 10,263 reviews shares Class Based, Moddable, Aliens, Third Person Shooter Alien Breed: Impact Alien Breed: Impact 70.7% · 944 reviews shares Twin Stick Shooter, Aliens, Third Person Shooter, Top Down Shooter Halo: Spartan Assault Halo: Spartan Assault 73.9% · 2,687 reviews shares Twin Stick Shooter, Aliens, Third Person Shooter, Top Down Shooter Halo: Spartan Strike Halo: Spartan Strike 76.2% · 875 reviews shares Twin Stick Shooter, Aliens, Third Person Shooter, Top Down Shooter Shadowgrounds Shadowgrounds 80.7% · 783 reviews shares Twin Stick Shooter, Aliens, Top Down Shooter, PvE STAR WARS™ Battlefront™ II STAR WARS™ Battlefront™ II 87.2% · 57,012 reviews shares Aliens, Third Person Shooter, PvP, Co Op STAR WARS™ Battlefront STAR WARS™ Battlefront 80.4% · 2,888 reviews shares Aliens, Third Person Shooter, PvP, Co Op SYNTHETIK 2 SYNTHETIK 2 80.2% · 2,634 reviews shares Class Based, Moddable, Twin Stick Shooter, Top Down Shooter

Screenshots

Official Steam store screenshots — click any shot to enlarge.

Facts & details

From the Steam store record, snapshot 2026-05-20.

GenresAction, Free To Play
Player tagsTwin Stick Shooter · PvE · Top-Down Shooter · Co-op · Class-Based · Third-Person Shooter · Aliens · Level Editor · Hacking · PvP · Moddable · Third Person (SteamSpy community voting)
FeaturesSingle-player · Multi-player · PvP · Online PvP · LAN PvP · Co-op · Online Co-op · LAN Co-op
LanguagesEnglish * , French, Italian, German, Spanish - Spain, Korean, Portuguese - Portugal, Russian, Simplified Chinese, Traditional Chinese, Ukrainian, Vietnamese, Japanese, Portuguese - Brazil *
ControllerFull support
Achievements198
Estimated owners200,000 – 500,000 (SteamSpy)
Official sitehttps://reactivedrop.com
Minimum system requirements (PC)

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