Co-operative multiplayer game and complete code base available for free.
User reviews:
Recent:
Very Positive (407 reviews) - 93% of the 407 user reviews in the last 30 days are positive.
Overall:
Overwhelmingly Positive (13,402 reviews) - 95% of the 13,402 user reviews for this game are positive.
Release Date: Jul 19, 2010

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"(Free) Co-operative multiplayer game and complete code base available for free. Made by Valve."

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
Customer reviews
Customer Review system updated! Learn more
Recent:
Very Positive (407 reviews)
Overall:
Overwhelmingly Positive (13,402 reviews)
Recently Posted
Love Dust Hate Wax
( 16.7 hrs on record )
Posted: May 3
Product received for free
NEEEEEEEEEEEEEEEEEEEEEEEEDS LIKE SO DEY SEE DIS AMAZINGNESS YE
-Alien mode (Co-operate as aliens.)
-Mining laser as a weapon you can unlock
-FREEZE RAYYYY
Helpful? Yes No Funny
djseamus1
( 0.6 hrs on record )
Posted: May 3
iv heard alot about this game and to be honest, this has the potential to one of the best valve games out there. couple of small problems though...
1. player base is TINY because it was apparently "just a multiplayer test".
2. very few maps.
3. lack of content.
this game could be as big as tf2 if not bigger, if only valve would invest some time into it. still, it plays amazingly, you could run it on a potato, and it really creates a dark and spooky atmosphere which makes the game all the more fun.
Helpful? Yes No Funny
¬G.P¬ мเиเ קµяקℓэ ( ͡° ͜ʖ ͡°)
( 2.4 hrs on record )
Posted: May 3
--short--
FPS capped at 100FPS

--long--
The fps in this game is capped at 100FPS and in order to change that u need to type fps_max (value) everytime u join a lobby/map change.
Helpful? Yes No Funny
TheRogueMarshmellow
( 3.2 hrs on record )
Posted: May 2
You know the games good when you play a little asian chick and try to kill your friend with a flamethrower
Helpful? Yes No Funny
Mr. Rowe
( 8.8 hrs on record )
Posted: May 2
Epic shoot em up game that requires team work. Not much of a tutorial but after looking at the keybindings,it's pretty simple and you have to conserve some of that ammo or just take extra with you :) My gf and I have been playing (seperate computers so yes you can roam and get lost) for the last 4 hours and love it. This is a sweet F2P! DO IT!
Helpful? Yes No Funny
brekcha
( 9.0 hrs on record )
Posted: May 2
looking for an intense game with sublime graphics and an incredible story that will grip, nay, pull you in? A game so immersive that you don't even need a VR headset to be a part off??? and is free to play!?!?!
well stop looking... just get this game instead.. It's aight, fun to play with mates.
Helpful? Yes No Funny
Dont™
( 3.3 hrs on record )
Posted: May 2
10/10 would run around a dimly lit map and fail to complete the objective while being chased by aliens again.
Helpful? Yes No Funny
BlackySparky
( 12.9 hrs on record )
Posted: May 1
♥♥♥♥'s good, barh
Helpful? Yes No Funny
Pachi3080
( 10.2 hrs on record )
Posted: May 1
Drawing simulator 2010
10/10 would draw d*cks in the minimap again.
Helpful? Yes No Funny
Valakar
( 1.8 hrs on record )
Posted: April 30
I played this game for a little under two hours, and this is the most stressed I've been in my entire life. The game is incredibly fun but I feel like I've been mentally tortured by adrenaline and desperation. The only way I could keep my sanity was by turning the level difficulty to easy, beating the level, and quickly closing the game.

I will probably never play this game again. I need a nap.

10/10
Helpful? Yes No Funny
meta
( 1.5 hrs on record )
Posted: April 30
1. Install Game
2. Bug friends to help you
3. Get the hat
4. Ditch your friends
5. Enjoy the crappy hat
Helpful? Yes No Funny
UrBoiJosh
( 1.1 hrs on record )
Posted: April 30
this blows ♥♥♥, unless like that :)
Helpful? Yes No Funny
Ghostface
( 1.0 hrs on record )
Posted: April 30
alien swarm is pretty much a tf2 L4D......and i like it
NOTE:never head alone and keep your squad alive
Helpful? Yes No Funny
Avalonn
( 17.5 hrs on record )
Posted: April 30
I'm addicted.
Helpful? Yes No Funny
deadmew
( 63.4 hrs on record )
Posted: April 30
What you still haven't played Alien Swarm yet? Go fix that now.

It's a great coop-experience, and even today it's easy to find someone to play with.
Teamplay is required on the higher difficulties and the speedruns are also fun to get.
The campaign is kinda short but that doesn't really matter.
There are lots of custom-maps available online as well (search discussions).

It's a shame valve abandoned this game, but I'm so glad it's still alive and kicking!
Helpful? Yes No Funny
THE POTATO MAN
( 11.8 hrs on record )
Posted: April 29
its a good little fun game
!
Helpful? Yes No Funny
Jonny
( 3.0 hrs on record )
Posted: April 29
i like it...... but i want more offline map.... thanks
Helpful? Yes No Funny
Most Helpful Reviews  In the past 30 days
6 of 6 people (100%) found this review helpful
Recommended
103.8 hrs on record
Posted: April 10
Amazing game ! This game had so much potential in it but Valve abandoned it.
Was this review helpful? Yes No Funny
3 of 3 people (100%) found this review helpful
Recommended
105.4 hrs on record
Posted: April 4
Extremely fun! It reminds me of the old days games like zombie shooter and alien shooter! Amazing.
Was this review helpful? Yes No Funny
3 of 3 people (100%) found this review helpful
Recommended
12.2 hrs on record
Posted: April 4
This. We need more of this.
Was this review helpful? Yes No Funny
3 of 3 people (100%) found this review helpful
Recommended
19.7 hrs on record
Posted: April 28
Valve should continue developping this amazing GAME.

Go Valve
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
Recommended
0.2 hrs on record
Posted: April 17
Though Valve doesn't support this game anymore, I still had a great time playing it!

9/10 Deserves a bit more TLC from its developers.
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
1 person found this review funny
Recommended
170.0 hrs on record
Posted: April 26
Not only has this game been the reason that i met one of the greatest guys i know. it has also provided me with hours of entertainment!

-Loads of servers
-Nice range of difficulty settings(not just easy, medium or hard) you can have very varied games!
-a game that makes repetitiveness fun and enjoable
-A rewarding leveling system
-a great selection of weapons
-(my fav XD) a mini map at the end of every mission that you can draw on......where everyone decides that a huge ♥♥♥♥ is the right thing to do
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
Recommended
3.3 hrs on record
Posted: April 5
It's a great coop game but its dead not many people play it and its not getting updated
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
Recommended
1.9 hrs on record
Posted: April 9
Great CO-OP shooter with fun gameplay and simple yet pretty graphics. It's a shame that it's not getting enough attention. The whole campaign is great, but on higher levels there's not much things to do. But still a fun game and it's free!
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
Recommended
28.0 hrs on record
Posted: April 13
Ah. One of Valve's babies... Alien Swarm. Completely lost in time, this fun alien top-view shooter puts you in control of a marine that is sent into a colony to kill the alien "swarm." Though it is free it lacks a lot of content. Now I do know this game was primarily made for the people to mod and make games out of ( Lambda Wars is a very good example) it has barely any campaign. If you have a good team the whole campaign can be completed in an hour or two. Very challenging if you don't play for a while and you really need to depend on your team-mates. #makeAlienSwarmGreatAgain,Valve!
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
1 person found this review funny
Recommended
11.7 hrs on record
Posted: April 7
The playerbase is dead, but this game is still going to continue being the best game on Steam ever.
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
1.7 hrs on record
Posted: April 9
really good game since is f2p

First of all i wasnt interested on this game,just for the tf2 hat.
But when i played it it was so good.
the only problem was the time to enter a game
but even with that problem is still good
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
4.2 hrs on record
Posted: April 16
Great team-based game, you can't finish a mission without teamwork.



Sadly, the player-base has decreased and the online servers are a ghost town.
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
15.2 hrs on record
Posted: April 15
This could be pretty fun but the problem is finding people. It's not that you won't find anyone but sometimes you gotta wait for some players to appear. All the maps/servers are well designed and gameplay is intense. But it's advisable to go with other players. Going alone would simply mean a suicide mission. It has everything which a free2play gamer desires except enough people. But servers are not empty you always see old loyal users/players from this game who are always there to fill that space. I recommend this game and I feel this game is still fun.

Here's my gameplay video: https://www.youtube.com/watch?v=0y2aQdWWtYg
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
16.0 hrs on record
Posted: April 4
This game is good for building teamwork. 3rd person overhead viewing changes it up from standard 3rd person shooters or regular FPS games. Put some good metal-core music for the bosses and you got yourself a match.
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
20.2 hrs on record
Posted: April 6
delightful. wish there was more.
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
1 person found this review funny
Recommended
12.4 hrs on record
Posted: April 24
Just great!! :D
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
46.2 hrs on record
Posted: April 24
This game is free, so I guess you can't beat that price. There are still some shortcomings, but again...it's free.

The campaign it comes with is pretty short and can be beat in a few hours, but it's still pretty fun to play through, and each level is really well done. You can download other custom maps too, or create your own with the SDK it comes with.

Gameplay wise, it's pretty simple but I think it's effective. Movement is tight, and there is a good variance in enemies and weapons. Some of the achievements were a pain but still fun to get.

I'd give it a 6.5/10. I think it's a really decent game, but it could have been so much more if Valve put in the effort to make it available for OS X and Linux, and pushed Workshop for it.
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
58.3 hrs on record
Posted: April 21
Alien Swarm is a super team-based game with many weapons and funny extras. The main game has only one campaign with seven missions, but they are very intense and if you are finished with them, you toggle the difficulty for a harder challenge. And if the story went boring, you can play on dedicated servers and play custom campaigns from other players for more fun.

In fact, for a free game a very impressive experience with great gameplay and much more aliens.
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
1 person found this review funny
Recommended
0.6 hrs on record
Posted: April 25
Play with friends , enable hardcore friendly fire , see the magic
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
14.4 hrs on record
Posted: April 24
The most dangerous enemy out there isn't the vast alien swarm, its the guy with the minigun who cannot aim, friendly fire is wiping out humanitys toughest marines. Game Over Man, Game over.

9/10 Their coming out of the walls!.
Was this review helpful? Yes No Funny