That One Thing
Why Alien Swarm sticks with us
The corridor where the swarm pours in from both ends and your medic is the only reason anyone makes the extraction.
Available editions
3 ways to play Alien Swarm. Each has its own install, community and verification status.
Alien Swarm: Reactive DropDefault
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.
GenreActionShooter
FeaturesControllerOnline MultiplayerModsCo-Op
CommunityUntestedvApr 20, 2017
Co-operative multiplayer game and complete code base available for free.
GenreActionShooter
FeaturesOnline MultiplayerCo-Op
OfficialOfficial
A free Source-engine RTS set in the Half-Life universe, playable on Steam.
GenreActionShooter
FeaturesOnline Multiplayer
CommunityUntested
About Alien Swarm
Alien Swarm is Valve's top-down co-op shooter: four marines drop into claustrophobic corridors, burn through ammo, and try not to get overrun by a hive that never stops coming. Classes matter — officer, special weapons, medic, tech — and so does not shooting your teammates when the hallway fills with parasites.
It shipped free on Steam in 2010 as a polished Source engine campaign with bots if friends are scarce. Missions are short, readable, and built around teamwork: cover the tech while they weld, keep the medic alive, and clear nests before the next wave spills out. The campaign is complete; there is no shop gate between you and the ending.
On PlayBound we list the original free Steam build. Controller support is partial on classic Swarm (console exec / Steam Input help); the community continuation Alien Swarm: Reactive Drop is the better pad-first option when you want official full controller support and a still-active multiplayer scene.
Why we picked it
We picked Alien Swarm because it is a finished Valve co-op campaign that costs nothing, plays cleanly in a short evening, and still teaches the same squad habits that later free shooters borrow. It is free gaming with a capital V.
Who it's for
Great if you want
- Players who want a short, finished free co-op campaign
- Friends who like top-down squad shooters over battle royale
- Anyone curious about Valve's free experiments on Source
Look elsewhere if
- Players who need modern native full controller support without Steam Input fiddling
- Anyone looking for a live service with seasonal content (see Reactive Drop)
- Solo players who dislike bots filling empty slots
Features
Singleplayer
Multiplayer
Co-op
Level Editor
Will this run on your PC?
Checking…
System Requirements
Minimum
Windows 7 / Vista / XP · Pentium 4 3.0 GHz · 1 GB RAM (XP) / 2 GB (Vista+) · DX9 GPU 128 MB SM 2.0 · 2.5 GB storage
Recommended
Windows 7+ · Core 2 Duo 2.4 GHz · 2 GB RAM · DX9 GPU SM 3.0 (GeForce 7600 / Radeon X1600 or better) · 2.5 GB storage
Frequently asked questions about Alien Swarm
Is Alien Swarm free?
Yes. Valve released it free on Steam. PlayBound hands off to Steam for download and updates — there is no separate PlayBound-hosted package.
How is this different from Alien Swarm: Reactive Drop?
Alien Swarm is Valve's original 2010 campaign. Reactive Drop is the free community continuation with more content, active multiplayer, and official full controller support. Both are listed separately on PlayBound.
Does it support controllers?
Partially. Classic Swarm often needs Steam Input or console commands. Reactive Drop ships official full controller support.
Can I play offline?
The campaign supports local play with bots. Online co-op needs Steam and a network connection.
Does Alien Swarm have multiplayer?
Yes. Alien Swarm supports up to 4 players. You can host a game on your own PC. PlayBound Connect handles the setup: start a party with your friends, pick how you want to play, and everyone launches into the same game from the PlayBound launcher. It also supports co-op play. There is no subscription and no paid multiplayer tier.
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