Co-operative multiplayer game and complete code base available for free.
User reviews: Overwhelmingly Positive (7,662 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
16 of 17 people (94%) found this review helpful
5.6 hrs on record
Posted: October 13
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.

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8 of 9 people (89%) found this review helpful
1.5 hrs on record
Posted: October 17
Very good the more people you have the better
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7 of 8 people (88%) found this review helpful
1.4 hrs on record
Posted: October 24
Cant believe this game is free!! Awesome co-op top down alien shooter.
Overall. 7/10.
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8 of 10 people (80%) found this review helpful
9.4 hrs on record
Posted: October 13
Very fun to play, missions repeated many times, and further I wanted to continue playing.
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7 of 10 people (70%) found this review helpful
37.0 hrs on record
Posted: October 13
First Game i played on steam 10/10 would play again if i had no moneys
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4 of 5 people (80%) found this review helpful
8.3 hrs on record
Posted: October 26
This game is hardcore oldschool skill based shooter. There is no mercy for people without eye/hand coordination.
You must think about health,ammo,friendly fire,being infested and many more. Normal mode is good for start. Real fun start when you are aware of enemy types and know how to counter them as a TEAM. Yes you can solo in this game but... the real fun of squad based shooters begin when you cover your mates and act your role :)

Lots of weapons and additional equipment make this game fun as hell when you try diffrent configurations.

Have fun even if it not too long.

MapPack is avaiable to download :)
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5 of 7 people (71%) found this review helpful
11.8 hrs on record
Posted: October 2
I love this game, this game is awesome
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2 of 2 people (100%) found this review helpful
3.2 hrs on record
Posted: October 27
great game i love it good to play with friends still some ♥♥♥♥♥♥♥s but good overall i give this game 8/10 boxes
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1 of 1 people (100%) found this review helpful
10.2 hrs on record
Posted: October 31
I was looking for a game beside the most popular and came to this beauty. Challenging maps, huge amount of unlockable weapons (one more badass than the other) and lots and lots of community-made maps to keep up the fun for hours.
If you have one or two good friends and you are looking for something good to play whenever you are annoyed by the russians in dota 2 or just need to kill some alien motherf*****s, I highly recommend this game. :D

10/10 for exploding aliens
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1 of 1 people (100%) found this review helpful
27.5 hrs on record
Posted: October 28
great alien game ;p
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4 of 7 people (57%) found this review helpful
7.1 hrs on record
Posted: October 2
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.
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4 of 7 people (57%) found this review helpful
4.4 hrs on record
Posted: October 24
couldnt recommend enough

4:20 on my speedrun

60/12
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1 of 4 people (25%) found this review helpful
28.3 hrs on record
Posted: October 24
Old game that still prove to be better than current source engine based game too bad the official campaign is only 1 but still fun even played again and again
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1 of 5 people (20%) found this review helpful
12.2 hrs on record
Posted: October 8
It's kinda like dust II in third person top down with aliens.
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0 of 4 people (0%) found this review helpful
38.5 hrs on record
Posted: October 28
Boring and dead. Was fun back in the day when people played.
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2 of 10 people (20%) found this review helpful
186.5 hrs on record
Posted: October 12
worth
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2 of 16 people (13%) found this review helpful
0.4 hrs on record
Posted: October 24
Couldn't even find a game to play online. Played the Solo play, but it wasn't the worst, nor greatest. The graphics are kind of plain, seen too many games like this.
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0 of 12 people (0%) found this review helpful
2.4 hrs on record
Posted: October 14
♥♥♥♥ty
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0 of 12 people (0%) found this review helpful
0.5 hrs on record
Posted: October 17
wot
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0 of 13 people (0%) found this review helpful
0.2 hrs on record
Posted: October 11
ummm no wat i expetced but i dont reccomend
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