Co-operative multiplayer game and complete code base available for free.
User reviews: Overwhelmingly Positive (7,514 reviews)
Release Date: Jul 19, 2010

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Play Alien Swarm

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Recommended By Curators

"You can't beat free, especially when it's this slick little co-op twin-stick shooter. Join up with friends and enjoy!"
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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
81 of 87 people (93%) found this review helpful
93.3 hrs on record
This is a very good and fun game to play with your friends!
- Very good gameplay
- A lot stuff to unlock
- Only one campaign but you can download maps made ​​by the community
- It's free!

8/10*
Posted: July 7
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58 of 64 people (91%) found this review helpful
2,131.2 hrs on record
Great and free. Better than the paid-for Alien games. The 4 player co-op can be intense. Good character leveling/tiny RPG elements and many, many weapons which are actually useful. Only bad thing is the story is pretty short and the actions stay the same during all reruns. But oh well, if you download custom maps you can enjoy it....... forever.
Posted: July 8
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20 of 28 people (71%) found this review helpful
7.5 hrs on record
This game is really fun. I enjoy playing it with friends. If you try to go at it alone, you're ♥♥♥♥ed. This is like Team Fortress 2 with aliens and ♥♥♥♥. You should download the game as soon as possible and come to me to hear me scream like a ♥♥♥♥♥ when I get swarmed. Even if you have 3 other teammates helping you out survive the swarm, it can get difficult at times with different types of aliens that drop down from the sky to lick your ♥♥♥♥♥♥♥. There's different classes too, though you will always need a medic on your team, since there's a type of alien that infects your character, and can only be healed by a medic. If you play aggresively, try Vindicator. They can drop ammo and use chainsaws and all that ♥♥♥♥. Engineers can drop sentries, big surprise there. You'll unlock more as you progress through the levels, the level cap being level 30. I think I'm at around level 15-20. Don't remember. Go out there and kick some alien ♥♥♥, ♥♥♥♥♥es!
Posted: July 26
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19 of 28 people (68%) found this review helpful
10.3 hrs on record
played this a fair bit with friends and was great fun
Posted: June 24
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12 of 16 people (75%) found this review helpful
22.2 hrs on record
This game contains a lots of Amiga games; characters like Chaos Engine, maps and aliens like Alien Breed . I love this gime and highly suggest.
Posted: July 26
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296 of 326 people (91%) found this review helpful
23.4 hrs on record
From what I can remember, playing this was really fun. A top down co-op alien shooter done correctly - complete with maps to draw ♥♥♥♥♥♥♥ on. The only downside was how short it was. Then again, it is a free game.
Posted: November 25, 2013
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