Co-operative multiplayer game and complete code base available for free.
User reviews: Overwhelmingly Positive (7,992 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
23 of 26 people (88%) found this review helpful
48.7 hrs on record
Posted: November 1
Possibly the best product Valve has ever pushed out. Ditched with the saddest excuse saying the game was just to test their free to play system.

A game which could have had endless amounts of content, updates, and a huge playerbase.

Not to mention the use of .vpk files instead of .bsp which made them not download-able directly from the server and required installing them via third party like old school mods which made the modding community very weak.

Lack of updates and the game eventually died.. in the hands of its creator.

9/10
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15 of 15 people (100%) found this review helpful
35.5 hrs on record
Posted: November 7
WEEK OF HOLIDAYS ON ALIEN PLANET

Free action game with the mode of cooperation in the style of the classic Alien Breed. The players are soldiers of various specializations who must break through levels full of dangerous monsters. Production requires coordination between the participants of fun, because there is always a lot of enemies and the various stages are bringing more and more of tough challenges.
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20 of 26 people (77%) 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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11 of 11 people (100%) found this review helpful
64.2 hrs on record
Posted: November 9
A game that could really use the benefit of the steam workshop.
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12 of 15 people (80%) found this review helpful
8.5 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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7 of 8 people (88%) found this review helpful
1.5 hrs on record
Posted: November 8
Recommended
Was this review helpful? Yes No
7 of 9 people (78%) found this review helpful
12.8 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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4 of 4 people (100%) found this review helpful
0.6 hrs on record
Posted: November 17
Nice coop! Rly nice!
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4 of 4 people (100%) found this review helpful
18.2 hrs on record
Posted: October 29
Valve please give this game more love !!!
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4 of 5 people (80%) found this review helpful
26.8 hrs on record
Posted: November 2
this game is awesome, little bit of cool graphics, cool aliens, and cool weaapons, but strong language
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2 of 2 people (100%) found this review helpful
16.2 hrs on record
Posted: November 12
BEST 3D SHOOTER GAME EVERRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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10 of 18 people (56%) found this review helpful
7.9 hrs on record
Posted: October 24
couldnt recommend enough

4:20 on my speedrun

60/12
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1 of 1 people (100%) found this review helpful
10.1 hrs on record
Posted: November 14
Suprisingly funny and good for being a free game, need more and longer campains thoug since it get a bit boring with only one campain.
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1 of 1 people (100%) found this review helpful
136.8 hrs on record
Posted: November 20
centipedes in my ♥♥♥♥♥♥ what else
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1 of 1 people (100%) found this review helpful
5.3 hrs on record
Posted: November 17
GG
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1 of 1 people (100%) found this review helpful
14.7 hrs on record
Posted: November 2
I once met a sexy walrus.
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1 of 1 people (100%) found this review helpful
124.7 hrs on record
Posted: October 29
fanta♥♥♥♥ingtastic game
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1 of 1 people (100%) found this review helpful
5.0 hrs on record
Posted: November 3
Fun
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1 of 1 people (100%) found this review helpful
25.5 hrs on record
Posted: November 3
more maps please. missions get repetitive.
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1 of 1 people (100%) found this review helpful
6.0 hrs on record
Posted: November 6
F2p
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