Co-operative multiplayer game and complete code base available for free.
User reviews: Overwhelmingly Positive (8,362 reviews)
Release Date: Jul 19, 2010

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"Well, well, well, noone of us expected that Alien Swarm is such an amazing title. Free, awesome, but still very short :(. We demand more campaigns!"

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
99 of 107 people (93%) found this review helpful
93.3 hrs on record
Posted: July 7
This is a very good and fun game to play with your friends!
- Very good gameplay
- A lot stuff to unlock
- Only one campaign but you can download maps made ​​by the community
- It's free!

8/10*
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73 of 79 people (92%) found this review helpful
2,269.5 hrs on record
Posted: July 8
Great and free. Better than the paid-for Alien games. The 4 player co-op can be intense. Good character leveling/tiny RPG elements and many, many weapons which are actually useful. Only bad thing is the story is pretty short and the actions stay the same during all reruns. But oh well, if you download custom maps you can enjoy it....... forever.
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48 of 52 people (92%) found this review helpful
48.7 hrs on record
Posted: November 1
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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41 of 42 people (98%) found this review helpful
65.0 hrs on record
Posted: November 9
A game that could really use the benefit of the steam workshop.
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34 of 41 people (83%) found this review helpful
5.6 hrs on record
Posted: October 13
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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22 of 22 people (100%) found this review helpful
38.4 hrs on record
Posted: November 7
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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23 of 32 people (72%) found this review helpful
7.5 hrs on record
Posted: July 26
This game is really fun. I enjoy playing it with friends. If you try to go at it alone, you're ♥♥♥♥ed. This is like Team Fortress 2 with aliens and ♥♥♥♥. You should download the game as soon as possible and come to me to hear me scream like a ♥♥♥♥♥ when I get swarmed. Even if you have 3 other teammates helping you out survive the swarm, it can get difficult at times with different types of aliens that drop down from the sky to lick your ♥♥♥♥♥♥♥. There's different classes too, though you will always need a medic on your team, since there's a type of alien that infects your character, and can only be healed by a medic. If you play aggresively, try Vindicator. They can drop ammo and use chainsaws and all that ♥♥♥♥. Engineers can drop sentries, big surprise there. You'll unlock more as you progress through the levels, the level cap being level 30. I think I'm at around level 15-20. Don't remember. Go out there and kick some alien ♥♥♥, ♥♥♥♥♥es!
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23 of 32 people (72%) found this review helpful
37.0 hrs on record
Posted: October 13
First Game i played on steam 10/10 would play again if i had no moneys
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15 of 18 people (83%) found this review helpful
8.5 hrs on record
Posted: October 26
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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13 of 15 people (87%) found this review helpful
18.2 hrs on record
Posted: October 29
Valve please give this game more love !!!
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22 of 32 people (69%) found this review helpful
1.4 hrs on record
Posted: October 24
Cant believe this game is free!! Awesome co-op top down alien shooter.
Overall. 7/10.
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10 of 11 people (91%) found this review helpful
7.6 hrs on record
Posted: September 26
Top down 4 player co-op shooter?

I think YES!

Pros
- Co-op strong
- Fun gameplay
- Great potential

Cons
- Player base is dead (in Australia, atleast, I'm not sure about U.S.A)
- Only 1 campaign (But you can download community made campaigns)

This game is a hidden gem. Recommend this game if you and your friends are bored and want something new!
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20 of 30 people (67%) found this review helpful
10.3 hrs on record
Posted: June 24
played this a fair bit with friends and was great fun
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10 of 12 people (83%) found this review helpful
12.8 hrs on record
Posted: October 31
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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8 of 9 people (89%) found this review helpful
70.1 hrs on record
Posted: December 1
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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12 of 17 people (71%) found this review helpful
22.2 hrs on record
Posted: July 26
This game contains a lots of Amiga games; characters like Chaos Engine, maps and aliens like Alien Breed . I love this gime and highly suggest.
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6 of 6 people (100%) found this review helpful
7.2 hrs on record
Posted: August 23
Alien Swarm is a game forgotten by both Valve as it's developer and the community. A game that had potential, but comes out just feeling unfinished. The concept is good enough, but it probably got canceled and someone just decided that it would be shame to leave it, and put up what they had at that time. And well, if it wasn't good enough, people didn't like it enough for it to become good thanks to the community.

The only thing that truly keeps this game alive, if you can even call it alive, is the fact it's fully Free to Play. No payment on Steam, no microtransactions, nothing. You can join the fray at any time and see what they got in store for you. However, it still features a level system - the more and the better you play, the bigger level you are and the better equipment you get.

This unlocks one of the games biggest advantages - a very smart equipment system. You can choose between four classes, with two characters for each, both with completely different playstyles. Then you get to choose your equipment, two weapons and a utility. Of course, all four of the classes have access to equipment available only to them, as well as access to certain shared equipment. For example, the Medic is the only one capable of carrying the Medikit or the Medigun, the Commander is the only one capable of carrying shotgun, the Engineer is the only one capable of carrying a rifle with autoaim etc. The game then features more than 40 weapons and about 15 utilities (if i recall correctly). This allows you to play the game differently every time, but thanks to the level system, certain weapons will always be better than others, even though the game does try to balance them out.

The gameplay is then based around a co-op mode for four players. You (and hopefully a team you can trust) are sent to a colony gone dark to investigate, and *drum roll* fight off aliens there *badumm tshhhhh*. However, you are alone. So you need to conserve ammunition, use medkits and cooperate while holding off the bugs in order to survive, and fulfil objectives along the way. All in a top-down Source game. That means the SDK makes the maps quite interesting, counting in things like fire, liquids or destructible enviroment, even some in-game animation parts along the way. This all creates a feeling of being swarmed and overrun, yet deeply dedicated to ending the mission succesfully and without casualities. Talking about casualities, it's worth noting that there's friendly fire ON by default. Watch it.

Probably the most notable change is the Source SDK here. If a big community would be on... millions of maps. IT's just that easy to make them. Tile based creation and Source modelling = Map. I tried it out myself, it took me exactly 76 minutes to recreate the first level. It's just sad it is not used.

Also please note that Win 8 is not supported by this game. It will run after you install it, but Win 8 will screw up it's files and you'll have to reinstall sooner or later.

As to my recommendation, I can say that this is a game you will enjoy at first, and then become disappointed by later. Play at your own risk.
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7 of 8 people (88%) found this review helpful
7.0 hrs on record
Posted: November 27
If you are able to play in Co-op it's real fun!
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12 of 18 people (67%) found this review helpful
9.4 hrs on record
Posted: October 13
Very fun to play, missions repeated many times, and further I wanted to continue playing.
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14 of 22 people (64%) found this review helpful
1.5 hrs on record
Posted: October 17
Very good the more people you have the better
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