Co-operative multiplayer game and complete code base available for free.
User reviews:
Recent:
Very Positive (399 reviews) - 94% of the 399 user reviews in the last 30 days are positive.
Overall:
Overwhelmingly Positive (14,255 reviews) - 95% of the 14,255 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 (399 reviews)
Overall:
Overwhelmingly Positive (14,255 reviews)
Recently Posted
Pavlík
( 1.6 hrs on record )
Posted: July 29
Give it a try, u won't be disappointed.
Helpful? Yes No Funny
SuicideRabbit
( 1.4 hrs on record )
Posted: July 29
Great game!We need workshop for this one.
Helpful? Yes No Funny
mrC
( 38.4 hrs on record )
Posted: July 28
Plain and simple. This game is ridiculously ♥♥♥♥ing fun, its just a shame more people don't play it because I'd be playing the ♥♥♥♥ out of it right now. And its free.... anyone who has played it enough would pay 15 bucks for this game easy.

Quality game -10/10
Helpful? Yes No Funny
Greekgodlover #TeamPyro
( 0.6 hrs on record )
Posted: July 28
I got it for the hat.
Helpful? Yes No Funny
crisoface
( 8.8 hrs on record )
Pre-Release Review
Posted: July 28
-
Helpful? Yes No Funny
GreaseMonkey (SithorX)
( 108.9 hrs on record )
Posted: July 28
Amazing game its 100% free sadly that they didnt release more content so its empty in players you wont find players to play with unless you have friends but this game is still really good and I hope one day they come back with this game.
Helpful? Yes No Funny
motionb
( 14.8 hrs on record )
Posted: July 27
I remember playing this 24/7 awhile ago.Its an amazing teamwork isometric game where you cna get upgrades,new tools,and even new guns without any money required.Each role is important so good teamwork usually means you win.
Helpful? Yes No Funny
Most Helpful Reviews  In the past 30 days
21 of 21 people (100%) found this review helpful
1 person found this review funny
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
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12 of 12 people (100%) found this review helpful
2 people found this review funny
Recommended
9.5 hrs on record
Posted: July 17
PLEASE PUT THIS ON STEAM WORKSHOP SO WE CAN GET SOME NEW CONTENT!!!

THIS GAME IS AMAZING!
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5 of 5 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
2 of 2 people (100%) found this review helpful
Recommended
1.0 hrs on record
Posted: July 19
Ive only played in practise mode but I was pleasantly surprised how good this is. All I need now is some friends to play coop with. Highly recommend 10/10
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2 of 2 people (100%) found this review helpful
Recommended
147.6 hrs on record
Posted: July 21
Alien Swarm is a top-down shooter. The game has a campaign that can be played in co-op with up to four players. There are four classes available: Officer, Special Weapons, Medic and Tech. Each class has two characters with different stats for one or more of the following: aim, ammo, reload speed, special abilities speed and others.
It's a great short game, also it's free! It takes about 1-2h to finish, there are quite a few difficulty modes and other settings that add a lot of replay value to the game, such as friendly fire dealing more or less damage, and onslaught mode, which brings a high variety of enemies to the beginning of the game to make things more interesting.
Unfortunately not many people play it these days, but I still enjoy it from time to time. So if you are in need of a player, then just ask. I'll be more than happy to join, and I should be able to bring a few friends as well.
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2 of 2 people (100%) found this review helpful
Recommended
21.5 hrs on record
Posted: July 2
I've played this game for something like, uh, 15 hours? But i really loved this game. I reinstalled it today, but unfortunately i didn't found a single person playing... It's really sad because it's a really well made and funny game. Hoping to see people playing it in future. Once i saw on the forum that they were doing an fps version of it, hoping to get some more information in the next days. Totally recommended, at least if you can find 3 other people to play with you.

8 maybe 9/10
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2 of 2 people (100%) found this review helpful
1 person found this review funny
Recommended
3.8 hrs on record
Pre-Release Review
Posted: July 6
this game is fun & challenging, has good graphics and sound and is free! you can't beat free!
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3 of 4 people (75%) 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
1 of 1 people (100%) found this review helpful
Recommended
30.7 hrs on record
Posted: July 10
Great game simple and fun you will love playing with friends and its free so try it !
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
35.4 hrs on record
Posted: July 10
Best experiences are to be had with a full group of friends. Once you've run through the game a couple of times you've seen all the game has to offer. Subsequent plays force you to get creative in order to have fun such as using only the chainsaw and spinning in circles the whole time.
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