Co-operative multiplayer game and complete code base available for free.
User reviews: Overwhelmingly Positive (9,345 reviews)
Release Date: Jul 19, 2010

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"(Free) Co-operative multiplayer game and complete code base available for free."
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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
289 of 305 people (95%) found this review helpful
1 person found this review funny
65.0 hrs on record
Posted: November 9, 2014
A game that could really use the benefit of the steam workshop.
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163 of 173 people (94%) found this review helpful
5 people found this review funny
48.7 hrs on record
Posted: November 1, 2014
Pre-Release Review
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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103 of 109 people (94%) found this review helpful
3 people found this review funny
18.2 hrs on record
Posted: October 29, 2014
Valve please give this game more love !!!
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57 of 60 people (95%) found this review helpful
2 people found this review funny
8.2 hrs on record
Posted: September 26, 2014
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!
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51 of 54 people (94%) found this review helpful
1 person found this review funny
38.4 hrs on record
Posted: November 7, 2014
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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64 of 77 people (83%) found this review helpful
1 person found this review funny
5.6 hrs on record
Posted: October 13, 2014
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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56 of 71 people (79%) found this review helpful
1 person found this review funny
37.0 hrs on record
Posted: October 13, 2014
First Game i played on steam 10/10 would play again if i had no moneys
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25 of 29 people (86%) found this review helpful
8.5 hrs on record
Posted: October 26, 2014
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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17 of 18 people (94%) found this review helpful
12.1 hrs on record
Posted: December 28, 2014
I used to play it with my friends some time ago.
A great sci-fi action co-op game!
If you have some friends willing to get in action and you like all that "UFO-PEWPEW-LAZERS", then there's no possibility of not loving this game!
I really like how they dealt with character development, where you can level up and achieve better weapons or items, which are big help and fun of course.

And yeah, i think that this game is underrated as HELL! It brought me and my friends tons of fun.

Giving it 8,5/10!
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18 of 21 people (86%) found this review helpful
1 person found this review funny
12.8 hrs on record
Posted: October 31, 2014
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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31 of 45 people (69%) found this review helpful
1.4 hrs on record
Posted: October 24, 2014
Cant believe this game is free!! Awesome co-op top down alien shooter.
Overall. 7/10.
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14 of 17 people (82%) found this review helpful
70.1 hrs on record
Posted: December 1, 2014
8 characters with different stats. Many weapons. Many perks. Levling up. Lots of aliens various aliens to kill. Additional fan made campaings extend fun and 5 difficulties allow for more experience. The problem is it comes with just one campaign, but it's a quality one. Coop on this game is great. Good mod, and it's free :D
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12 of 15 people (80%) found this review helpful
7.0 hrs on record
Posted: November 27, 2014
If you are able to play in Co-op it's real fun!
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20 of 30 people (67%) found this review helpful
1 person found this review funny
6.8 hrs on record
Posted: September 27, 2014
I can punch red barrels
10/10
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13 of 18 people (72%) found this review helpful
1 person found this review funny
0.1 hrs on record
Posted: January 10
This game is pretty fun, eventhough I haven't played much, swear on me mum.
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15 of 22 people (68%) found this review helpful
9.4 hrs on record
Posted: October 13, 2014
Very fun to play, missions repeated many times, and further I wanted to continue playing.
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18 of 28 people (64%) found this review helpful
1.5 hrs on record
Posted: October 17, 2014
Very good the more people you have the better
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7 of 8 people (88%) found this review helpful
1 person found this review funny
13.0 hrs on record
Posted: December 1, 2014
Pre-Release Review
8 characters with different stats.
Many weapons. Many perks. Levling up.
Lots of aliens various aliens to kill.
Additional fan made campaings extend fun and 5 difficulties allow for more experience.
The problem is it comes with just one campaign, but it's a quality one.
Coop on this game is great.

Good mod, and it's free :D

Screw the other free 2 play bad games on Steam
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8 of 10 people (80%) found this review helpful
35.2 hrs on record
Posted: November 2, 2014
this game is awesome, little bit of cool graphics, cool aliens, and cool weaapons, but strong language
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6 of 7 people (86%) found this review helpful
1 person found this review funny
1.4 hrs on record
Posted: December 1, 2014
This game is good, simple and entertaining. I recommend this.
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