Co-operative multiplayer game and complete code base available for free.
User reviews: Overwhelmingly Positive (10,797 reviews)
Release Date: Jul 19, 2010

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"(Free) Co-operative multiplayer game and complete code base available for free."
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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.
  • 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

System Requirements

    Minimum:
    • OS: Windows® 7 / Vista / Vista64 / XP
    • Processor: Pentium 4 3.0GHz
    • Memory: 1 GB for XP / 2GB for Vista
    • Graphics: DirectX 9 compatible video card with 128 MB, Shader model 2.0. ATI X800, NVidia 6600 or better
    • Hard Drive: At least 2.5 GB of free space
    • Sound: DirectX 9.0c compatible sound card
    Recommended:
    • OS: Windows® 7 / Vista / Vista64 / XP
    • Processor: Intel core 2 duo 2.4GHz
    • Memory: 1 GB for XP / 2GB for Vista
    • Graphics: DirectX 9 compatible video card with Shader model 3.0. NVidia 7600, ATI X1600 or better
    • Hard Drive: At least 2.5 GB of free space
    • Sound: DirectX 9.0c compatible sound card
Helpful customer reviews
102 of 109 people (94%) found this review helpful
1 person found this review funny
179.1 hrs on record
Posted: February 4
A game that is better than many sad excuse of AAA titles. Just hope that someday, one day Valve will realise that this game had much more possibility and decide to release more content, more extra charge or not. Personally I can fork $25 for extra content for this game and I'm sure many players share the same sentiment as me.

Axios!
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59 of 61 people (97%) found this review helpful
1 person found this review funny
13.0 hrs on record
Posted: March 2
This is a really fun game !
The only negative aspect is that it's so short (1 Campaing).
This is really a gem !
In my wildest dream Valve would create a either "Alien Swarm 2; The forgotten lands" or come up with a few more campaing for this one.
It is really a great game !
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70 of 82 people (85%) found this review helpful
1 person found this review funny
20.1 hrs on record
Posted: June 10
This game has a lot of... "bugs"
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59 of 67 people (88%) found this review helpful
2 people found this review funny
2.4 hrs on record
Posted: July 7
That I was looking for! Excellent coop, aliens, many weapons, survival and of course free to play.
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34 of 36 people (94%) found this review helpful
1 person found this review funny
626.9 hrs on record
Posted: March 8
First of all, this game is great and free!
So at least give it a try yourself.

It's a great coop based game. To take the best out of the game you have to work together and play your part in the mission.
The official campain is great fun and you can play it over and over again, trying different ways to beat it.
Join ASB, Riflemod or chickenscoop servers to have even more variation in Alienswarm.

Sadly, this game does not have a workshop. That means you have to manually install map packs when you want to play other maps than the default 7.

To get most of the game with additional settings, pvp modes, 8 player coop, new weapons, challanges and pre installed maps get Reactive Drop. Though make sure to join the official RD-group for scheduled events.
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