Co-operative multiplayer game and complete code base available for free.
User reviews:
Recent:
Very Positive (272 reviews) - 94% of the 272 user reviews in the last 30 days are positive.
Overall:
Overwhelmingly Positive (13,853 reviews) - 95% of the 13,853 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
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Recent:
Very Positive (272 reviews)
Overall:
Overwhelmingly Positive (13,853 reviews)
Recently Posted
LYNX
( 0.1 hrs on record )
Posted: June 26
nice
Helpful? Yes No Funny
aputriment
( 2.2 hrs on record )
Posted: June 25
10/10 would die to the parasite again
Helpful? Yes No Funny
cpt_ricard
( 24.5 hrs on record )
Pre-Release Review
Posted: June 25
I can't begin to tell you how awesome this free game is. NEEDS CONTROLLER SUPPORT. Also Needs more levels and updates or workshop ASAP but sadly has sat lonely and alone for the longest time.
Helpful? Yes No Funny
( 5.4 hrs on record )
Posted: June 25
This game is really good, killing aliens top down!
Helpful? Yes No Funny
AR-15
( 16.5 hrs on record )
Posted: June 25
Although the game seems a bit dated, it is still a very fun, engaging game that I've spent a decent amount of time on. At first I only bought the game to get the TF2 hat, but the more that I played, the more I found I enjoyed it. The multiplayer is still very alive, and is even more alive when you find people to play with that you know, or that you've met playing multiplayer online. Once you reach the max rank, you can obtain a prestige level at the cost of going back to the first rank with the starter weapons. This allows you to be more respected by other players, challenge yourself, and keep replayabilty on the table.

That being said, there are also negatives that come with this game such as graphical errors, improper multiplayer syncing, and other things, but are to be expected. (These don't happen near often enough to ruin the game or the way it plays.)

All in all, this game is easily a 9/10 in my books.

KEEP IN MIND: If you download and open the game to find that there are no servers: fear not! Each lobby only holds 4 players, and full lobbies are hidden. Games usually don't last too horribly long, so if you wait a bit, you will will find an open lobby and be able to join a game.
Helpful? Yes No Funny
HunterBSRG
( 15.6 hrs on record )
Posted: June 25
It's a good game
the graphics I would rate it at 8/10
The sound quality is good
Gameplay I would give it 9/10
Overall it's a nice game
And it's free too :P
Helpful? Yes No Funny
here come dat boi!
( 0.7 hrs on record )
Posted: June 25
10/10 uninstall simulator
Helpful? Yes No Funny
( 1.2 hrs on record )
Posted: June 24
Very dynamic and fun game! Amazing for playing with friends!
Helpful? Yes No Funny
Argoss
( 1.4 hrs on record )
Posted: June 24
I am only not recommending this because it is a Valve game that I cannot put on my Steam Machine/Ubuntu computer. -.-
Get on it.
Helpful? Yes No Funny
Smurf Boy
( 49.8 hrs on record )
Posted: June 24
Wonderful game. if you dont think its the kind of game you like, still try it. besides, its free!! 11/10
Helpful? Yes No Funny
Most Helpful Reviews  In the past 30 days
20 of 20 people (100%) found this review helpful
2 people found this review funny
Recommended
25.7 hrs on record
Posted: June 13
Two things about this game are mysteries to me.
1. Why the game so good is for free.
2. And why it's not as popular as it deserves to be.
Was this review helpful? Yes No Funny
11 of 11 people (100%) found this review helpful
2 people found this review funny
Recommended
2.6 hrs on record
Posted: June 3
It is fun and solid.

Plus, it is free.

What´s not to love?

Addendum:
It does not have controller support, unfortunately.
Was this review helpful? Yes No Funny
14 of 17 people (82%) found this review helpful
2 people found this review funny
Recommended
5.9 hrs on record
Posted: June 4
I feel bad that people don't play this game anymore,if Valve made it a first person shooter it would probably be a lot more popular.But atleast you can make it first person with some console commands.Good game! ;)
Was this review helpful? Yes No Funny
11 of 12 people (92%) found this review helpful
10 people found this review funny
Recommended
2.6 hrs on record
Posted: June 10
If you have a few friends, and a couple of hours, you can easily blow through this little game. You won't regret any of it either.

Me: "ok what do we do now guys?"
Friend 1: "we put the bomb over there"
Friend 2: "ok then what"
Friend 1: "idk, something"
Me: "what is that timer?"
Friend 3: "RUN!"
other 3 of us: "what?"
we then proceeded to follow Friend 3 who led us in circles for some time before leading us into an ambush where we died before the bomb could get to us

9/10 If only it was longer
Was this review helpful? Yes No Funny
8 of 9 people (89%) found this review helpful
Recommended
416.6 hrs on record
Posted: June 2
First game I ever played on Steam, years ago now. Helped me come to accept that Steam wasn't malware :P.

Some people say that the community is dead, or bad.

It's not, there's still a large number of pro players active. Many welcome new players. Some times when you try to find a game, at that moment, there may be none available. Still plenty of people playing; each lobby holds 4 players, each game takes a few minutes. Every full lobby is invisible. People come and go. Consider starting a lobby yourself if at that moment you cannot find any players, it's rare for more than a couple minutes to pass without someone joining. If nobody ever joins your hosting, check your ports, maybe you're not set to handle hosting - that would keep people out of your game for sure.

Or just check for open games in 30 seconds or so. There's often quite a flux of players going.

Years after I started to play this game, I keep coming back to it. I like how the teamwork works, I like how the game is complex enough at the higher levels that I'm still getting better at it, even after so many hours of play.
Was this review helpful? Yes No Funny
5 of 5 people (100%) found this review helpful
Recommended
4.5 hrs on record
Posted: June 17
This is how i discovered this game
(me): wanted hats for tf2
(guide:) you need to complete 2 missions of alien swarm
(me:) "clicks download"
1 HOUR LATER
(me:) completes 2 missions
(me): finds hat on TF2
keeps playing dis game

SO i really loved this game but not many people play it and there should be more game modes
here are my suggestions:

survival: stand off the alien horde
escape: run from the aliens
plant the bomb: run into the horde while your freinds deafen i mean defend you
bughunt: hunt the boss aliens whilst tackling its freinds
Was this review helpful? Yes No Funny
5 of 6 people (83%) found this review helpful
1 person found this review funny
Recommended
5.7 hrs on record
Posted: June 10
I think Alien Swarm is a pretty cool guy, eh kills aleins and doesn't afraid of anything.

Actually though, this is a great game. Massacre aliens with up to three other people (and a lot more guns), weld doors shut to try and keep them out, cut doors open because oh-crap-you-have-to-go-back-through-there, and get butchered by the Swarm. You'll die. A lot. But it's super fun.
Was this review helpful? Yes No Funny
3 of 3 people (100%) found this review helpful
Recommended
24.4 hrs on record
Posted: May 27
I used to play this game at 2010, Long time passed and I saw this game again and thought "I should give it a try again" and I don't regret it.
Was this review helpful? Yes No Funny
3 of 3 people (100%) found this review helpful
Recommended
0.4 hrs on record
Posted: June 8
make it mac playable too pls
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
Recommended
15.0 hrs on record
Posted: June 12
First game I ever played on steam, the nostalgia is great. Awesome free game very fun and simple
Was this review helpful? Yes No Funny