Alien Swarm cover
SeriesAlien Swarm

Alien Swarm

Critic score1 critic
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First release
Jul 10, 2010
Publisher
Valve
Engine
Source
Genres
Shooter · Warfare, Action, Science fiction
Platforms
PC (Microsoft Windows)

Alien Swarm is a game and Source SDK release from a group of talented designers at Valve who were hired from the Mod community. Available free of charge, the game thrusts players into an epic bug hunt featuring a unique blend of co-op play and squad-level tactics. With your friends, form a squad of four distinct IAF Marine classes. Plan your attack using an unlockable arsenal of weapons with countless loadout configurations against a wide variety of aliens. Blaze your way through an overrun, off-world colony, eradicating the alien infestation in environments ranging from the icy planet's surface, to a subterranean lava-flooded mining facility. Along with the game get the complete code base for Alien Swarm that features updates to the Source engine as well as the SDK. Alien Swarm adds 3rd person camera, depth of field, improved dynamic shadows and a wide variety of gameplay additions to the Source engine.

Also known as AS

Attributes

No Attributes added.

Details

Storyline, release dates, time to beat, age ratings, modes, links, keywords

Release dates
PC (Microsoft Windows)
Jul 10, 2010
Time to beatIGDB · recorded
Main Story
2h
Main + Extras
4h
Completionist
4h
Age ratings
ESRB MPEGI 16
Game modes
Co-operative, Multiplayer, Single player
Perspective
Bird view / Isometric
Keywords
aliens, futuristic warfare, bloody, shoot 'em up, 3d
… All 48, invasion, future, insects, military, futuristic, mission based, spaceship, online co-op, extra terrestrial, steam, leveling, achievements, bullet time, online, freeware, hacking, teleportation, slow-motion, free-to-play, alien invasion, darkness, explosion, steam achievements, steam cloud, platform exclusive, 4 player co-op, downloadable content, auto-aim, melee, in-game map editor, friendly fire, nuclear bomb, healer, mod origin, valve anti-cheat, mod support, multiplayer lan, active reload, dedicated servers, swarming enemies, motion tracker, novint falcon support, gunship

At a Glance

Critic Score
60
Main Story (IGDB)
2h
Main + Extras (IGDB)
4h
Completionist (IGDB)
4h
OverviewHow it playsMediaCommunityBehind the gameRelated

Overview

Steam review summary

Steam users rate this Very Positive, 21,650 reviews in all languages, recorded 24 October 2026

Valve's summary of Steam user reviews. Valve counts only reviews from purchases on Steam, not key activations, and leaves out review periods it has marked as off-topic. It isn't part of the CritScore score.

Review summary: SteamSteam data provided via the Steam Web API (opens in a new tab)Not affiliated with Valve →

About storefront and compatibility information

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