Co-operative multiplayer game and complete code base available for free.
User reviews:
Recent:
Very Positive (361 reviews) - 92% of the 361 user reviews in the last 30 days are positive.
Overall:
Overwhelmingly Positive (13,563 reviews) - 95% of the 13,563 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 (361 reviews)
Overall:
Overwhelmingly Positive (13,563 reviews)
Recently Posted
MrNevada117
( 1.2 hrs on record )
Posted: May 25
Product received for free
Absolutely love the game!
Helpful? Yes No Funny
Crusader Geofry
( 0.6 hrs on record )
Posted: May 25
Product received for free
This game reminds me of hell divers. also free tf2 hat!
Helpful? Yes No Funny
Vuk
( 8.6 hrs on record )
Posted: May 25
This game is perfect for hard-core action strategy players. Perma-death, resource scarcity and excellent balances, all rolled up into one amazing coop experience that everyone must try out with their reliable and trustworthy friends.

...if you ain't got any of those, the online community that still plays it, the ones that stayed, are probably more trustworthy then your friends ever will be lol, and that's the truth.
Helpful? Yes No Funny
☢StrikeR☢
( 5.5 hrs on record )
Posted: May 25
Nice Co op game to play with friends
Helpful? Yes No Funny
King Deucalion
( 48.0 hrs on record )
Posted: May 25
Fun to play.
Helpful? Yes No Funny
Gakael
( 9.7 hrs on record )
Posted: May 25
Product received for free
Just great !
Helpful? Yes No Funny
D_A_R
( 1.3 hrs on record )
Posted: May 25
Я люблю поиграть в неё вечером
Helpful? Yes No Funny
DragonNinja
( 50.1 hrs on record )
Posted: May 24
Product received for free
play more.
it's awesome.
Helpful? Yes No Funny
ShMo
( 74.4 hrs on record )
Posted: May 24
Product received for free
I got it for free.
Downloaded it for free.
Played it for free.
Leveled up for free.
Got all the gear for free.
Reset my level to get a Prestige badge for free.
Died for free.
Got good for free.
Speedran a few levels for free.
Beat a level on the highest difficulty for free.
Recommended the game for free.
Helpful? Yes No Funny
redfuck
( 54.2 hrs on record )
Posted: May 24
Ah, One of my first games in steam, got lots of memorys here.
Helpful? Yes No Funny
Rudolf Męczywór [PL]
( 1.4 hrs on record )
Posted: May 23
everybody came here to get tf2 hat :)
Helpful? Yes No Funny
maimunqka01bg
( 6.5 hrs on record )
Posted: May 23
Product received for free
It's very funny - better than CS, better than Half-Life... It's pretty awesome. But add more maps!!!
Helpful? Yes No Funny
Cookie guy
( 21.4 hrs on record )
Posted: May 23
More levels PLS!!!
Helpful? Yes No Funny
Francisco the Zombie Princess
( 3.4 hrs on record )
Posted: May 22
Product received for free
BLUE BLUE BLUE

Why is everything blue? The game isn't all bad BUT EVERYTHING IS COLORED BLUE! Seriously! the loading screen is entirely blue, the screen where you pick your charecter is blue (exept for your guys head, the picture in the corner and the yellow on the map). The game is so dark you HAVE TO get flares so you can see colors other than blue.


BLUE BLUE BLUE BLUE BLUE BLUE!
Helpful? Yes No Funny
Flad
( 5.5 hrs on record )
Posted: May 22
Great game, have played it several times with my friends.
Wish there was more content.
Helpful? Yes No Funny
Darwin SWAGerson (WATTERson)
( 2.4 hrs on record )
Posted: May 20
Product received for free
Came for a TF2 hat , but the game turned out pretty fun when playing with friends ! I will continue to play this game and hopefully it gets even better after the first 2 co-op missions.
Helpful? Yes No Funny
Accidental Nudity
( 6.5 hrs on record )
Posted: May 20
yo dawg we heard you liked shooting aliens so we put aliens inside of aliens inside of a space station on top of a moon.
then because we know you LOVE aliens dawg we put more aliens and doors you can seal to hide from those nasty mo'fukas.
You wanted guns you get GUNS!!
and bacon!
BACON GUNS!!
ALIEN BACON GUNS!!
BACON!!
GUNS!!
ALIEN POR--- Wait ♥♥♥♥ no not that...

ALIENS!!!

KILL THEM ALL AND EAT THE BACON!!!
Helpful? Yes No Funny
Reaper
( 30.8 hrs on record )
Posted: May 20
Need more love it is one of best coop game
Helpful? Yes No Funny
Vindi
( 13.6 hrs on record )
Posted: May 20
Product received for free
A fun and tactical team based game, best to play with friends, but the lack of extra campaings bugs me out. Otherwise good game.
Helpful? Yes No Funny
Most Helpful Reviews  In the past 30 days
41 of 44 people (93%) found this review helpful
2 people found this review funny
Recommended
12.7 hrs on record
Posted: May 4
Great game, if only developers didn't abandon it few years ago it would be a big hit. We need to pray and wait for game to get patches and content :)
Was this review helpful? Yes No Funny
34 of 35 people (97%) found this review helpful
4 people found this review funny
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
15 of 16 people (94%) found this review helpful
2 people found this review funny
Recommended
192.8 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
8 of 8 people (100%) found this review helpful
2 people found this review funny
Recommended
1.9 hrs on record
Posted: May 9
Product received for free
Interesting top-down shooter that is free to play for all Steam users, uses the Source Engine 2010. Based on the movie Aliens.

Alien Swarm is a top-down shooter set at a 60-degree angle. Four players can join a single co-operative game, the aim of which is to progress through science fiction-themed levels while eliminating waves of AI aliens. Players can choose from 40 different pieces of equipment.

The game is class-based, with players choosing from the roles of Officer, Special Weapons, Medic, and Tech. Each class has two selectable characters, with differences in abilities.

Officer =
Grants a passive bonus to damage and damage resistance to nearby allies. He has access to the Vindicator, a class-restricted shotgun with an incendiary grenade launcher and has general all-around abilities. They are also capable of throwing extra amounts of explosive ordnance, and may find class-restricted ammo caches on the field for his Vindicator shotgun. The two playable characters are Sarge and Jaeger.

Special Weapons =
Brings raw damage to the table and starts out with a customized autogun with superior parameters, high magazine capacity, and auto-aiming ability. The Special Weapons gains access to a powerful minigun at a high enough level, and can pick up class-restricted ammo caches on the field. The two playable characters are Wildcat and Wolfe.

Medic=
Is the only class able to equip and deploy temporary healing beacons, and at a high enough level can use a medigun to selectively heal teammates and themselves. The two playable characters are Faith and Bastille.

Tech =
Carries a motion sensor, sets up sentry guns faster, welds doors faster, and is the only class capable of unlocking certain door panels or completing certain objectives by means of a hacking minigame. They also have access to a prototype assault rifle with auto-aiming capabilities and the ability to fire stun grenades. The two playable characters are Crash and Vegas.

The game includes persistent statistics, unlockable equipment, and Steam Achievements.

for more info:

https://www.youtube.com/watch?v=I71N70PLDk0

http://www.metacritic.com/game/pc/alien-swarm

http://www.destructoid.com/review-alien-swarm-179900.phtml

http://www.ign.com/games/alien-swarm/pc-744670
Was this review helpful? Yes No Funny
5 of 5 people (100%) found this review helpful
1 person found this review funny
Recommended
1.9 hrs on record
Posted: May 9
Product received for free
its free, hard as bones, and fun. no reason to not get it
Was this review helpful? Yes No Funny
5 of 5 people (100%) found this review helpful
Recommended
2.6 hrs on record
Posted: May 13
This is such a great game! Playing with your friends is highly recommended for this! one of my favorite shooters
Was this review helpful? Yes No Funny
6 of 8 people (75%) found this review helpful
Recommended
1.3 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.
Was this review helpful? Yes No Funny
3 of 3 people (100%) found this review helpful
1 person found this review funny
Recommended
22.7 hrs on record
Posted: April 27
Can we pleeeeeeeeease get Local CO-Op ? ? ?

I know nobody supports this game but maybe just maybe : < ?
Was this review helpful? Yes No Funny
3 of 3 people (100%) found this review helpful
Recommended
5.5 hrs on record
Posted: May 22
Great game, have played it several times with my friends.
Wish there was more content.
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
Recommended
79.1 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!
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
Recommended
2.4 hrs on record
Posted: May 20
Product received for free
Came for a TF2 hat , but the game turned out pretty fun when playing with friends ! I will continue to play this game and hopefully it gets even better after the first 2 co-op missions.
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
Recommended
4.8 hrs on record
Posted: May 18
Product received for free
Best free game on Steam
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
Recommended
0.5 hrs on record
Posted: May 18
Fun, Fast, Free.... Fantastic 10/10
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
1.4 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
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
5.0 hrs on record
Posted: May 10
very fun to play with friends
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
8.3 hrs on record
Pre-Release Review
Posted: May 8
Great top down game, difficult as hell though. Can be played co-op with friends which was a lot of fun :)
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
64.3 hrs on record
Posted: May 9
Product received for free
one of the best free coop game on steam if u are into this kinda games :D
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
1 person found this review funny
Recommended
10.4 hrs on record
Posted: May 12
Product received for free
A very good game but i want more updates. Valve isnt supporting this game anymore i think.
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
10.5 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!
Was this review helpful? Yes No Funny