Alien Swarm
Released Jul 2010
Co-operative multiplayer game and complete code base available for free.
94% positive · 22K reviews
Done
All announced content has been released
High confidence
Done
All announced content has been released
High confidence
Where to get it
Free on Steam
Evaluation
Alien Swarm launched as a free-to-play game on July 19, 2010. Shortly after launch, Valve shipped one notable post-launch update on August 23, 2010, adding an AI Director, new difficulty modes, and additional promotion ranks. After that, developer activity effectively ceased — the only other recorded update is a minor security and localization maintenance patch from August 18, 2020, nearly a decade later, with no new content. There are no unreleased DLC listings, no announced future content, no roadmap, and no developer statements suggesting additional content is planned. The store description presents the game as a complete, feature-rich package with no mention of ongoing development. With a decade-plus of silence following the last content update, and only a routine maintenance patch in between, the game is best understood as a finished product that has been complete since August 2010.
Evidence
Post-launch update added AI Director (Onslaught mode), Brutal difficulty, Hardcore Friendly Fire toggle, and 3 new promotion ranks — the last substantive content update to the game.
Store description presents the game as a complete package — fixed set of missions, weapons, classes, and achievements — with no mention of planned future content or ongoing development.
Media
Details
Developer
Publisher
Valve
Achievements
66
Platform
Windows
Controller
—
Steam Deck
Playable
Players
Single-player · Multiplayer · Co-op
About this game
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.
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.
- Tactical, 4 player co-op action game with a top-down perspective
- Complete game code and mod tools
- Unlock persistent items by gaining levels
- Over 40 weapons and equipment with countless loadout configurations
- 4 unique classes and 8 unique characters
- Matchmaking, Steam Cloud, Steam Stats
- 64 achievements
- Tile-based map generation tool
- Powered by Source and Steam
Are these done yet?
Last evaluated Jun 28, 2026
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