Co-operative multiplayer game and complete code base available for free.
User reviews: Overwhelmingly Positive (9,913 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
477 of 502 people (95%) found this review helpful
2 people 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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61 of 66 people (92%) 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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25 of 27 people (93%) 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 24 people (79%) 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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19 of 24 people (79%) 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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13 of 17 people (76%) 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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6 of 6 people (100%) found this review helpful
1 person found this review funny
5.8 hrs on record
Posted: March 2
This is a really fun game !
The only negative aspect is that it's so short (1 Campaing).
This is really a gem !
In my wildest dream Valve would create a either "Alien Swarm 2; The forgotten lands" or come up with a few more campaing for this one.
It is really a great game !
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7 of 8 people (88%) 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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8 of 10 people (80%) found this review helpful
1 person found this review funny
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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9 of 12 people (75%) found this review helpful
150.8 hrs on record
Posted: February 4
A game that is better than many sad excuse of AAA titles. Just hope that someday, one day Valve will realise that this game had much more possibility and decide to release more content, more extra charge or not. Personally I can fork $25 for extra content for this game and I'm sure many players share the same sentiment as me.

Axios!
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6 of 7 people (86%) found this review helpful
1 person found this review funny
622.4 hrs on record
Posted: March 8
First of all, this game is great and free!
So at least give it a try yourself.

It's a great coop based game. To take the best out of the game you have to work together and play your part in the mission.
The official campain is great fun and you can play it over and over again, trying different ways to beat it.
Join ASB, Riflemod or chickenscoop servers to have even more variation in Alienswarm.

Sadly, this game does not have a workshop. That means you have to manually install map packs when you want to play other maps than the default 7.

To get most of the game with additional settings, pvp modes, 8 player coop, new weapons, challanges and pre installed maps get Reactive Drop. Though make sure to join the official RD-group for scheduled events.
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7 of 9 people (78%) found this review helpful
138.3 hrs on record
Posted: November 20, 2014
centipedes in my ♥♥♥♥♥♥ what else
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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
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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4 of 4 people (100%) found this review helpful
2.0 hrs on record
Posted: January 25
Good multiplayer game and it's for free. Singleplayer is also available, but this game was designed for coop mode. Since the community is almost dead, you'll only have a chance to play multiplayer if you invite your friends.
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7 of 10 people (70%) found this review helpful
1 person found this review funny
1.4 hrs on record
Posted: December 1, 2014
This game is good, simple and entertaining. I recommend this.
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3 of 3 people (100%) found this review helpful
28.8 hrs on record
Posted: December 29, 2014
Great Co-op game but with a short official campaign. There are some user created maps and short campaigns worth looking into.
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3 of 3 people (100%) found this review helpful
29.9 hrs on record
Posted: January 4
Pre-Release Review
This game is quite awesome to play together with friends.
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3 of 3 people (100%) found this review helpful
7.8 hrs on record
Posted: February 26
This game is amazing fun and really tough. Game is ment to be a coop game and without team work you may just find yourself struggling on every mission
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3 of 3 people (100%) found this review helpful
2.8 hrs on record
Posted: March 14
Amazing free game! Its a good excuse to just play because you are bored. Its free. Made by valve. Includes facehuggers (I want xenomorphs, too)!
The graphics are 9/10. If it was in first person itd be one of the top 5 games on steam. Love it
all in all, bacuse of the graphics and 3rd person issue, 9/10!
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