Co-operative multiplayer game and complete code base available for free.
User reviews:
Recent:
Very Positive (409 reviews) - 94% of the 409 user reviews in the last 30 days are positive.
Overall:
Overwhelmingly Positive (14,241 reviews) - 95% of the 14,241 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 (409 reviews)
Overall:
Overwhelmingly Positive (14,241 reviews)
Recently Posted
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
PJs Ass
( 51.0 hrs on record )
Posted: July 27
Great coop game with friends or pubs. Can be a short and easy game to spill some alien guts, all the way up to an adrenaline pumping systematic slaughter from a full 4-man team speed run through the original campaign.
After all that, if you still want more, there is community created maps and a couple of steam groups who are keeping the support strong for all those still interested.
Helpful? Yes No Funny
[GR] Fl4m3T4l0n
( 0.1 hrs on record )
Posted: July 26
It crashes every time I try to play.

I can go to the main menu and change the setting and all of that, but when I try to play it just crashes my pc.
Helpful? Yes No Funny
BBQFTW
( 1.6 hrs on record )
Posted: July 26
Awesome shooter game. 9/10
Helpful? Yes No Funny
pryingchalice
( 2.1 hrs on record )
Posted: July 25
When I saw this game, I was really exited - I thought it would be something like first-person-shooter, maybe like Alien Isolation, Dead Space and Helldivers combined. But the words ''Top-Down'' Discouraged me. Not for long.

The game is amazing, considering it was for a mod. The campaign is simply amazing, even though a little short (which is good), the personalities, voice acting, storyline is just perfect and really touching, reminding me of the old days from Halo 3: ODST. The game is co-op which brings even more fun to it. There is a certain elemnt of horror in this: music level changing, depending on jumpscares and Swarm Rushes, not enough light, and the silence with the beeping of the motion tracker (Alien Isolation, anybody). To finish good stuff, the graphic design is super creepy and cool, the weapons and equipment is really fun and the game is overall quite hardcore, especially on higher difficulties - and achievements are fun to.

I dont ussually give a thumbs down, but I now I have to, Its not the game is bad or anything but the community is dead. Devs didnt add anything new(ok, its a mod - and game is old too). Then the player base left - on main servers I cant even find a single person to play with. If you find anybody, please freind them - this will be your only chance to enjoy this game.

This game is truly amazing. But, until the community gets back (which probably wont happen since you cant use Worskshop for this game), you might have to pass.





But otherwise, 9/10. And its free.
Helpful? Yes No Funny
Generic evil minion#124
( 15.2 hrs on record )
Posted: July 25
Its free, its plays well and its only fualt is being too short. so play it what do you have to lose?
Helpful? Yes No Funny
Captain is kill
( 2.0 hrs on record )
Posted: July 25
Fun with friends, it looks a bit outdated but it is free. And when things get claustrophobic you'll feel your heart start to pound.
Helpful? Yes No Funny
Krombopulos Michael
( 49.6 hrs on record )
Posted: July 25
Awesome survive the the swarm game very fun to play with both friends and strangers warning frendly fire can become crazy
Helpful? Yes No Funny
Frin
( 0.8 hrs on record )
Posted: July 25
It's Wonderful for a free game!

This thing here is savage as ffffff.
Helpful? Yes No Funny
Most Helpful Reviews  In the past 30 days
86 of 95 people (91%) found this review helpful
14 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
29 of 30 people (97%) found this review helpful
2 people 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
17 of 17 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
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7 of 7 people (100%) found this review helpful
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!
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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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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
1 of 1 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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