Co-operative multiplayer game and complete code base available for free.
User reviews: Overwhelmingly Positive (9,549 reviews)
Release Date: Jul 19, 2010

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"(Free) Co-operative multiplayer game and complete code base available for free."
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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
Helpful customer reviews
360 of 378 people (95%) found this review helpful
1 person found this review funny
65.0 hrs on record
Posted: November 9, 2014
A game that could really use the benefit of the steam workshop.
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210 of 221 people (95%) found this review helpful
1 person found this review funny
48.7 hrs on record
Posted: November 1, 2014
Pre-Release Review
Possibly the best product Valve has ever pushed out. Ditched with the saddest excuse saying the game was just to test their free to play system.

A game which could have had endless amounts of content, updates, and a huge playerbase.

Not to mention the use of .vpk files instead of .bsp which made them not download-able directly from the server and required installing them via third party like old school mods which made the modding community very weak.

Lack of updates and the game eventually died.. in the hands of its creator.

9/10
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140 of 149 people (94%) found this review helpful
1 person found this review funny
18.2 hrs on record
Posted: October 29, 2014
Valve please give this game more love !!!
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55 of 58 people (95%) found this review helpful
1 person found this review funny
38.4 hrs on record
Posted: November 7, 2014
WEEK OF HOLIDAYS ON ALIEN PLANET

Free action game with the mode of cooperation in the style of the classic Alien Breed. The players are soldiers of various specializations who must break through levels full of dangerous monsters. Production requires coordination between the participants of fun, because there is always a lot of enemies and the various stages are bringing more and more of tough challenges.
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72 of 85 people (85%) found this review helpful
5.6 hrs on record
Posted: October 13, 2014
Alien Swarm is completely FREE, so why not?

My friends and I installed this game and finished it in one night (5 hours) of good co-op fun.

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63 of 84 people (75%) found this review helpful
1 person found this review funny
37.0 hrs on record
Posted: October 13, 2014
First Game i played on steam 10/10 would play again if i had no moneys
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32 of 36 people (89%) found this review helpful
1 person found this review funny
8.5 hrs on record
Posted: October 26, 2014
This game is hardcore oldschool skill based shooter. There is no mercy for people without eye/hand coordination.
You must think about health,ammo,friendly fire,being infested and many more. Normal mode is good for start. Real fun start when you are aware of enemy types and know how to counter them as a TEAM. Yes you can solo in this game but... the real fun of squad based shooters begin when you cover your mates and act your role :)

Lots of weapons and additional equipment make this game fun as hell when you try diffrent configurations.

Have fun even if it not too long.

MapPack is avaiable to download :)
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20 of 21 people (95%) found this review helpful
1 person found this review funny
12.1 hrs on record
Posted: December 28, 2014
I used to play it with my friends some time ago.
A great sci-fi action co-op game!
If you have some friends willing to get in action and you like all that "UFO-PEWPEW-LAZERS", then there's no possibility of not loving this game!
I really like how they dealt with character development, where you can level up and achieve better weapons or items, which are big help and fun of course.

And yeah, i think that this game is underrated as HELL! It brought me and my friends tons of fun.

Giving it 8,5/10!
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19 of 22 people (86%) found this review helpful
1 person found this review funny
12.8 hrs on record
Posted: October 31, 2014
I was looking for a game beside the most popular and came to this beauty. Challenging maps, huge amount of unlockable weapons (one more badass than the other) and lots and lots of community-made maps to keep up the fun for hours.
If you have one or two good friends and you are looking for something good to play whenever you are annoyed by the russians in dota 2 or just need to kill some alien motherf*****s, I highly recommend this game. :D

10/10 for exploding aliens
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34 of 50 people (68%) found this review helpful
1 person found this review funny
1.4 hrs on record
Posted: October 24, 2014
Cant believe this game is free!! Awesome co-op top down alien shooter.
Overall. 7/10.
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17 of 21 people (81%) found this review helpful
1 person found this review funny
70.1 hrs on record
Posted: December 1, 2014
8 characters with different stats. Many weapons. Many perks. Levling up. Lots of aliens various aliens to kill. Additional fan made campaings extend fun and 5 difficulties allow for more experience. The problem is it comes with just one campaign, but it's a quality one. Coop on this game is great. Good mod, and it's free :D
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14 of 18 people (78%) found this review helpful
1 person found this review funny
7.0 hrs on record
Posted: November 27, 2014
If you are able to play in Co-op it's real fun!
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8 of 9 people (89%) found this review helpful
1 person found this review funny
13.0 hrs on record
Posted: December 1, 2014
Pre-Release Review
8 characters with different stats.
Many weapons. Many perks. Levling up.
Lots of aliens various aliens to kill.
Additional fan made campaings extend fun and 5 difficulties allow for more experience.
The problem is it comes with just one campaign, but it's a quality one.
Coop on this game is great.

Good mod, and it's free :D

Screw the other free 2 play bad games on Steam
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16 of 25 people (64%) found this review helpful
1 person found this review funny
9.4 hrs on record
Posted: October 13, 2014
Very fun to play, missions repeated many times, and further I wanted to continue playing.
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19 of 31 people (61%) found this review helpful
1 person found this review funny
1.5 hrs on record
Posted: October 17, 2014
Very good the more people you have the better
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9 of 13 people (69%) found this review helpful
1 person found this review funny
35.2 hrs on record
Posted: November 2, 2014
this game is awesome, little bit of cool graphics, cool aliens, and cool weaapons, but strong language
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4 of 4 people (100%) found this review helpful
39.2 hrs on record
Posted: November 15, 2014
When I first played this game. I didn't love it. But when I revisited it, It was amazing. At first the game is a little weird to get used but very easy to learn. The story is kinda weak but the missions are fun. There's alot to download in the workshop if you get bored, and some pretty intense servers as well.

Overall, the game is enjoyable, has a good amount of replay value, and it's made by Valve (so it's going to be good anyway).
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4 of 4 people (100%) found this review helpful
5.7 hrs on record
Posted: November 15, 2014
Alien Swarm.This game is a birds-eye co-op game that is qquite fun but has some issues.
1) Community - This game can be very fun, but nobody plays it. Working in teams of four is the only way to beat missions on tougher difficulties but the only way to have a team of four is to play with friends or on singleplayer (which sucls)
2) Class restrictions - While you can play as any class in the game 2 are required for most missions. The Tech, who unlocks doors and completes objectives is required for some missions and if they die, you lose. The Medic - THis is the main problem, because there is no good way to heal other than the medi-gun some player is froced to go medic. Not too bad sometimes but if no-one else your playing with has unlocked the medi-gun, it can be hell.
3) ITS TOO SHORT - A huge problem with this game is that it only has one campaign with 8 or so missions. These can be really fun but once completed there's not much to go back to.

Now that I'm finished with negatives, here are some of the postives

1) Classes - You can play as four classes, which are usaully fun with a good loadout. The Leader has a nice all-around skill, The Heavy just shoots the crap outta the aliens, the medic will save you from parasites and death and the tech unlocks doors, completes adjectives and is very useful. Oh and did I mention there are two characters of each class, for more variety :D
2) Parasites - Yes, I just said parasites are a positive thing for this game. Parasites are small aliens that latch onto your head and maul you unless you can be healed. While these can induced frustrating and quick deaths, they are a challenge that forces you to stay together with your medic.
3) Aliens - Of course they had to be in here! While not in to much variety, the types that there are make the game interesting (and sometimes a pain in the ♥♥♥!).
4) The weapons - You unlock weapons as you level up. Sentries can provide a quick escape from a quick death and the flamethrower is incredibly fun to use!
5) Levelling up - Levelling up gives you a sense of achievement as you shoot the crap out of aliens with that amazing new minigun you just unlocked
6) And finally loudout customization! - The game features 3 slots to change weapons, a primary weapon to kill things with. A secondary or piece of equipment. This can be more ammo, another weapon, a sentry etc. And finally the 3rd slot (forgot the name) which can carry passive armour, light attachments, welders (very useful) and other helpful things.
7)It's free too! (almost forgot.

In summary it's a fun game but it has a small community which can ruin it. But all-in-all you might as well try it out because its freee!
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4 of 4 people (100%) found this review helpful
4.0 hrs on record
Posted: November 23, 2014
In the future when the mutant bread has taken over the Team Fortress 2 bases and were abandoned, for so we thought.
rate of 10 episode 2 book 2 movie 2 percent 2/ out of 10 (͡°͜3͡°)
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4 of 4 people (100%) found this review helpful
13.3 hrs on record
Posted: December 10, 2014
There is a lot of fun to be had here once you get the hang of things and start to understand the few maps the game has. You do need the right team-mates however when playing online because team-play only enhances and prolongs the fun while running off by yourself will only make things harder.

There is enough variation in the gameplay with different classes who each have their own strengths, abilities and (unlockable) weapons. As well as the levels that you go through that all have their own objectives that you need to accomplish before you can move on. It keeps things fresh and interesting for a little while, though that replay value could have been longer if the campaign wasn't as short as it is.
Luckily there is always the modding community you can trust on to provide you with tons of new maps you only need to do a bit of work for it because there is no Workshop support as of yet.

Best thing of all though.... it's completely free!
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