Co-operative multiplayer game and complete code base available for free.
User reviews:
Recent:
Very Positive (408 reviews) - 94% of the 408 user reviews in the last 30 days are positive.
Overall:
Overwhelmingly Positive (14,202 reviews) - 95% of the 14,202 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 (408 reviews)
Overall:
Overwhelmingly Positive (14,202 reviews)
Recently Posted
GHOST MAKER
( 0.9 hrs on record )
Posted: July 24
Awesome fun !
Helpful? Yes No Funny
Caralho!!!
( 2.9 hrs on record )
Posted: July 24
Funny and interesting game in which you can play with friends, but very small selection of maps(
P.S. and change the main menu screen saver

because when I first started the game , I felt monstrosity and desirable to remove it. After a 20 minute wait I found one player first level and I started a mission
So cool emotions I never feel the adrenaline , hardcore, scream and my partner, I need a doctor.
It's very atmospheric game, and continue to make it better
Helpful? Yes No Funny
[WG]Bolky
( 3.2 hrs on record )
Posted: July 23
good game but just 1 level hahaahaha
Helpful? Yes No Funny
\m/ Dave Mustaine \m/
( 0.2 hrs on record )
Posted: July 23
It's a fun multiplayer game to enjoy with friends :D
Helpful? Yes No Funny
t dog
( 6.3 hrs on record )
Posted: July 23
played it when i first came on steam and it was my first free steam game. was awesome to play it and hopefully it's still active like it used to be on launch.
Helpful? Yes No Funny
Alucard_LichIEatPeople
( 6.0 hrs on record )
Posted: July 23
Valve add support on this like seriously wtf happen to this game
Helpful? Yes No Funny
0o000|Meteora
( 1.0 hrs on record )
Posted: July 23
Game is dead. No players.
Helpful? Yes No Funny
Airmaniac
( 51.6 hrs on record )
Pre-Release Review
Posted: July 22
Good alien shooter clone
Helpful? Yes No Funny
Kirin~
( 10.3 hrs on record )
Posted: July 22
nice game
Helpful? Yes No Funny
Most Helpful Reviews  In the past 30 days
79 of 87 people (91%) found this review helpful
12 people found this review funny
Recommended
112.4 hrs on record
Posted: June 28
It was my first game ever on Steam.
+ Free game
+ CO-OP
+ Have fun with your friends
+ Achievements
+ TF2 hat


- Few players
- Random disconnects

Was this review helpful? Yes No Funny
22 of 23 people (96%) found this review helpful
1 person found this review funny
Recommended
200.7 hrs on record
Posted: June 28
Great game. Shame they didn't make additional maps and more content for it. That being said, I would have paid money for this game, but instead it was FREE! So, it was fun while it lasted.
Was this review helpful? Yes No Funny
15 of 17 people (88%) found this review helpful
Recommended
5.4 hrs on record
Posted: June 25
This game is really good, killing aliens top down!
Was this review helpful? Yes No Funny
12 of 12 people (100%) found this review helpful
Recommended
62.3 hrs on record
Posted: July 10
As others said, this game is good, and although devs kinda stoped working on it (because they don't eat for free), i thank that the game is still available to play :D.

Mates, if you say "only one campaign" or "game is short", I highly recommend to play "fan made" campaigns. Try the old school: search google + "alien swarm maps", not that hard

put the .vpk in "...\Steam\steamapps\common\Alien Swarm\swarm\addons"
a few examples of good maps:
paranoia_full_version
as_arctic-infiltration
research7

the rest see reviews or try them yourself
Was this review helpful? Yes No Funny
4 of 4 people (100%) found this review helpful
1 person found this review funny
Recommended
9.8 hrs on record
Posted: July 11
The game presents one of the best isometric coops I have ever seen. (And take in consideration that I'm writing this in July 2016). It's well thought of, dynamic, stable, and challenging. You have to actually coordinate with the team, pre select the gear, get good with the class you use, etc.

"Watch where you are shooting, shitbag" is the most common phrase you gonna hear in the voice chat. Because when ♥♥♥♥ hits the fan, everybody panics and shoots and pray. And you can shoot with a good variety of guns, and inventories are not over colmplicated.

Cons: mmhhh, the game starts right up, in a slow pace, but some mechanics are not explained at all, and in the middle of the chaos you can get confused at first with what the hell your self healing pack does, or your welder... but that's old school and cool at the same time. Not really a con.
If I may, there's only one real con:

TOO SHORT, and no steamworkshop... what the hell?
I could play this for years with no problem, dammit steam!
Was this review helpful? Yes No Funny
3 of 3 people (100%) found this review helpful
Recommended
53.0 hrs on record
Posted: July 10
Very good game for playing with friends
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
Recommended
0.8 hrs on record
Posted: June 26
this game is really fun you will love playing with friends
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
Recommended
7.8 hrs on record
Posted: June 27
Absolutely love the individual roles and the feeling of the struggle to survive as you discover what happened by reading the data pads lying around each level. And without the option to turn off friendly fire, it makes the game far more realistic and difficult. A very cool challenge!!
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
Recommended
5.2 hrs on record
Posted: July 11
I JUST SHOT MY TEAMMATES, AND IT WAS AWESOME!

Love how the game is so far. Love how there are objects, and that there are certain requirements per map. Difficulty is pretty good too. More campaigns plz!!

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2 of 2 people (100%) found this review helpful
Recommended
8.7 hrs on record
Posted: July 13
QUICK AND SHORT REVIEW
Alien Swarm is a game abandoned by Valve, just because it didn't make profit.
The gameplay is good, even though it gets boring pretty quick (2-3 hours).
Not surprising, for a 2 GB game, that had almost no updates to it.
Do I recommend this game ?

YES, but even then, you need to have the bots, because the community for this game is dead.
How may you spawn them ?
Here's the command: "cl_selectm <0-7> -1" where 0-7 is the marine you want, and -1 is "next slot".

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