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Play Alien Swarm

Free Game


About the 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


    • 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


    • 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
70 of 77 people (91%) found this review helpful
146 products in account
13 reviews
187.5 hrs on record
Alien Swarm is one of my personal favorite Co-op,Top-Bottom,Action games of all time. I used to play it everyday when i got home from school, i am now the last promotion/level... In the game you are basically a team of 4 Space Marines trying to defeat an Alien infestation, your team will come across many hardships while attempting this, on certain maps you have to kill parasite spawners to get to the next checkpoint or turn on reactors to reach the next. You can choose different classes that help your team in many ways, obviously the medic can heal the other team-mates and themself, their is also a Tech that can hack into panels to open doors for the team. And of course their is the Officer and Special Weapons that are unique in their own ways.
Posted: March 2nd, 2014
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49 of 54 people (91%) found this review helpful
95 products in account
4 reviews
50.9 hrs on record
I've played Alien Swarm quite a bit already and I gotta tell you it's awesome. The default campaign is already loads of fun to do with friends, and with the different difficulties you can really make yourself struggle. I think it's most fun to play with friends while communicating over TS/Ventrilo, but playing it with randoms is fun as well! There are a huge number of custom campaigns out there which are really nice. The controls are nice and there are no real downsides to this game.

This game is free anyway so why not give it a shot?
Posted: March 15th, 2014
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26 of 29 people (90%) found this review helpful
337 products in account
14 reviews
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!

Posted: July 7th, 2014
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11 of 12 people (92%) found this review helpful
101 products in account
6 reviews
1,594.7 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 8th, 2014
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12 of 18 people (67%) found this review helpful
24 products in account
7 reviews
72.3 hrs on record
this game is so fun. check out gameplay below:

Posted: July 11th, 2014
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273 of 296 people (92%) found this review helpful
954 products in account
10 reviews
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 penises on. The only downside was how short it was. Then again, it is a free game.
Posted: November 25th, 2013
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