Co-operative multiplayer game and complete code base available for free.
User reviews: Overwhelmingly Positive (7,552 reviews)
Release Date: Jul 19, 2010

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Recommended By Curators

"Well, well, well, noone of us expected that Alien Swarm is such an amazing title. Free, awesome, but still very short :(. We demand more campaigns!"

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
5 of 6 people (83%) found this review helpful
6.8 hrs on record
I can punch red barrels
10/10
Posted: September 27
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5 of 6 people (83%) found this review helpful
101.1 hrs on record
Ironic how a F2P game on Source engine has better matchmaking and less bugs than CS:GO and L4D2.
Posted: September 27
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3 of 3 people (100%) found this review helpful
7.6 hrs on record
Top down 4 player co-op shooter?

I think YES!

Pros
- Co-op strong
- Fun gameplay
- Great potential

Cons
- Player base is dead (in Australia, atleast, I'm not sure about U.S.A)
- Only 1 campaign (But you can download community made campaigns)

This game is a hidden gem. Recommend this game if you and your friends are bored and want something new!
Posted: September 26
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2 of 2 people (100%) found this review helpful
1.4 hrs on record
Cant believe this game is free!! Awesome co-op top down alien shooter.
Overall. 7/10.
Posted: October 24
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2 of 2 people (100%) found this review helpful
1.5 hrs on record
Very good the more people you have the better
Posted: October 17
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3 of 4 people (75%) found this review helpful
5.6 hrs on record
Alien Swarm is completely FREE, so why not?

My friends and I installed this game and finished it in one night (5 hours) of good co-op fun.

Posted: October 13
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3 of 4 people (75%) found this review helpful
9.4 hrs on record
Very fun to play, missions repeated many times, and further I wanted to continue playing.
Posted: October 13
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1 of 1 people (100%) found this review helpful
0.2 hrs on record
Fun passtime activity and can be used on most labtops :-)
Posted: September 28
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1 of 1 people (100%) found this review helpful
5.1 hrs on record
Great Co-op Game, Good when you have 3 other friends and nothing to do.
Posted: September 28
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1 of 1 people (100%) found this review helpful
11.8 hrs on record
I love this game, this game is awesome
Posted: October 2
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1 of 1 people (100%) found this review helpful
1.5 hrs on record
really good game it reminds me of halo
Posted: September 27
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1 of 1 people (100%) found this review helpful
2.1 hrs on record
I love this game. It's great for friends to get together and test the strength in teamwork between the four in the game. I suggest anyone who is good with planning and teamwork edge to play this game.
Posted: September 30
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2 of 3 people (67%) found this review helpful
37.0 hrs on record
First Game i played on steam 10/10 would play again if i had no moneys
Posted: October 13
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1 of 2 people (50%) found this review helpful
5.6 hrs on record
Rorschachs Journal: This game, while small, is a great game from Valve that's like a top down version of Left4Dead except with alien bugs. It runs on the Source engine and enables people to make their own maps which is a plus. I like how weapons are unlockable but the default weapons still can stand a good chance against enemies on higher difficulties. Overall, it's free and I can't think of a reason not to buy it! Valve sure knows how to cater it's fans with free little gems like this game
Posted: September 26
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1 of 2 people (50%) found this review helpful
12.2 hrs on record
It's kinda like dust II in third person top down with aliens.
Posted: October 8
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0 of 1 people (0%) found this review helpful
37.0 hrs on record
Great game
Posted: September 28
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0 of 1 people (0%) found this review helpful
7.1 hrs on record
Free and fun to play. Can't get much better than that.

Downside is that it doesn't have a lot of content, but it's still fun to play with friends. Well worth downloading.
Posted: October 2
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0 of 1 people (0%) found this review helpful
5.2 hrs on record
dead within a week
Posted: October 3
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0 of 1 people (0%) found this review helpful
7.7 hrs on record
Good Game
Posted: October 5
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0 of 1 people (0%) found this review helpful
0.5 hrs on record
wot
Posted: October 17
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