Co-operative multiplayer game and complete code base available for free.
User reviews: Overwhelmingly Positive (10,059 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
34 of 36 people (94%) found this review helpful
1 person found this review funny
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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21 of 27 people (78%) found this review helpful
1 person found this review funny
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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21 of 30 people (70%) found this review helpful
1 person found this review funny
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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16 of 21 people (76%) 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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13 of 16 people (81%) found this review helpful
1 person found this review funny
164.5 hrs on record
Posted: February 4
A game that is better than many sad excuse of AAA titles. Just hope that someday, one day Valve will realise that this game had much more possibility and decide to release more content, more extra charge or not. Personally I can fork $25 for extra content for this game and I'm sure many players share the same sentiment as me.

Axios!
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9 of 9 people (100%) found this review helpful
1 person found this review funny
5.8 hrs on record
Posted: March 2
This is a really fun game !
The only negative aspect is that it's so short (1 Campaing).
This is really a gem !
In my wildest dream Valve would create a either "Alien Swarm 2; The forgotten lands" or come up with a few more campaing for this one.
It is really a great game !
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8 of 9 people (89%) found this review helpful
1 person found this review funny
626.4 hrs on record
Posted: March 8
First of all, this game is great and free!
So at least give it a try yourself.

It's a great coop based game. To take the best out of the game you have to work together and play your part in the mission.
The official campain is great fun and you can play it over and over again, trying different ways to beat it.
Join ASB, Riflemod or chickenscoop servers to have even more variation in Alienswarm.

Sadly, this game does not have a workshop. That means you have to manually install map packs when you want to play other maps than the default 7.

To get most of the game with additional settings, pvp modes, 8 player coop, new weapons, challanges and pre installed maps get Reactive Drop. Though make sure to join the official RD-group for scheduled events.
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5 of 5 people (100%) found this review helpful
2.2 hrs on record
Posted: January 25
Good multiplayer game and it's for free. Singleplayer is also available, but this game was designed for coop mode. Since the community is almost dead, you'll only have a chance to play multiplayer if you invite your friends.
http://steamcommunity.com/sharedfiles/filedetails/?id=439163976 http://steamcommunity.com/sharedfiles/filedetails/?id=441079207
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5 of 5 people (100%) found this review helpful
2.8 hrs on record
Posted: March 14
Amazing free game! Its a good excuse to just play because you are bored. Its free. Made by valve. Includes facehuggers (I want xenomorphs, too)!
The graphics are 9/10. If it was in first person itd be one of the top 5 games on steam. Love it
all in all, bacuse of the graphics and 3rd person issue, 9/10!
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5 of 5 people (100%) found this review helpful
1 person found this review funny
15.8 hrs on record
Posted: April 20
This is a really Good game I hope people who already played this game come back to bring it alive again , LOVE <3
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9 of 13 people (69%) 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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4 of 4 people (100%) found this review helpful
1 person found this review funny
0.7 hrs on record
Posted: December 10, 2014
-Free
-Boost Cooperativity
-Third Person Shooter
-Alien

But most of all... a free hat :)


7/10
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4 of 4 people (100%) found this review helpful
13.3 hrs on record
Posted: December 10, 2014
There is a lot of fun to be had here once you get the hang of things and start to understand the few maps the game has. You do need the right team-mates however when playing online because team-play only enhances and prolongs the fun while running off by yourself will only make things harder.

There is enough variation in the gameplay with different classes who each have their own strengths, abilities and (unlockable) weapons. As well as the levels that you go through that all have their own objectives that you need to accomplish before you can move on. It keeps things fresh and interesting for a little while, though that replay value could have been longer if the campaign wasn't as short as it is.
Luckily there is always the modding community you can trust on to provide you with tons of new maps you only need to do a bit of work for it because there is no Workshop support as of yet.

Best thing of all though.... it's completely free!
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4 of 4 people (100%) found this review helpful
156.3 hrs on record
Posted: April 24
One of the greatest Games on Steam, really a shame Valve left it with only 1 campaign and no Updates.
An Update including the Map Pack 1.2 would be great for example
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4 of 4 people (100%) found this review helpful
25.6 hrs on record
Posted: January 13
This game is intense, and rather fun! Leveling is addictive, and it's one of those games that kinda suck if you are playing it on your own, so you should gather some friends to play this

Only one problem, though....It's pretty damn short! But definitely worth the time, plus, it's free, do I need to say more?

Second game I ever played on steam!
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3 of 3 people (100%) found this review helpful
22.4 hrs on record
Posted: March 21
it is like left 4 dead 2, but this is an alien multiplayer Co-Op where you can play with random users or your friends againts the different kinds of aliens and saving the humanity!

Good reasons why this game should be recommended

- you can level up by finishing the mission and UNLOCK NEW WEAPONS!
- Best TPS (Third Person Shooter) Gameplay
AND
- A lot of rates
GG WP, you guys can add me and play with me :)
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3 of 3 people (100%) found this review helpful
11.3 hrs on record
Posted: December 30, 2014
Amazing game, the only flaw is that it's too short.
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3 of 3 people (100%) found this review helpful
0.8 hrs on record
Posted: February 1
This is an awesome game.

However, make sure you have a group of friends to play it with you, as the servers are a largely barren and desolate wasteland.
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3 of 3 people (100%) found this review helpful
108.0 hrs on record
Posted: April 16
If you are poor then this is the bomb.
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4 of 5 people (80%) found this review helpful
29.4 hrs on record
Posted: February 25
its fun
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