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.

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About Hypovolemia with 4 comments by defragen1 on Jan 21st, 2014

Thank you everyone that helped us get Steam green lighted! I'm very pleased about that, despite somehow having more no votes than yes lol. No worries, with new illustrations being worked on, we will have a much better time promoting the game in the near future.

I have uploaded a new video! In the video, an updated version of skygrounds can be seen and the latest iteration of our flashy particle effects.

The SPK ( Russian faction ) will spawn with TWO item_vodkas instead of a single medkit ( which heals 50hp ).
Drinking each vodka will heal 25hp and we plan to make the character throw/smash the bottle into the ground when he is done drinking. As always, you can not have enough destruction! Also, we have way more gibbable models in the game now, so expect a good ol' smashing!

With that out of the way.. I would like to announce that I have begun pimping our HYP facebook page!
So please hop on over there and give us a like! Exclusive development pics and other goodies can be found there.
Hypovolemia Facebook Page!
I would like to see the community unified in someway before our upcoming/second release.
There's nothing more I would love to see than at least 1,000 likes on our Facebook before we unleash 0.2.

So hit us up and show your support, go go go!

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Reactive Drop 1.04 to 1.07 Patch
Alien Swarm

Reactive Drop 1.04 to 1.07 Patch

Apr 16, 2014 Reactive Drop Patch 0 comments

Extract archive into sourcemods. Requires 1.04 or higher version installed.

Reactive Drop 1.04
Alien Swarm

Reactive Drop 1.04

Apr 9, 2014 Reactive Drop Full Version 2 comments

Full version. Extract archive into sourcemods. Core features are 8 players support, Rifle Mod features, PvP game modes.

Rifle Mod Server Files Update
Alien Swarm

Rifle Mod Server Files Update

Apr 4, 2014 Alien Swarm Rifle Mod Full Version 0 comments

A number of fixes and features were added into Rifle Mod. You can now play the original Alien Swarm by typing rm_challenge 0 in console. You also can...

Alien Swarm Rifle Mod Server Files
Alien Swarm

Alien Swarm Rifle Mod Server Files

Jan 2, 2014 Alien Swarm Rifle Mod Full Version 0 comments

Server files for Rifle Mod which you can put on your dedicated server or regular game.

Source Multi-Tool 1.0
Half-Life 2

Source Multi-Tool 1.0

Nov 23, 2013 Garrys Mod Mapping Tool 3 comments

I've been working away at this for quite awhile now and after many revisions I'm happy to release version 1.0 of the new Source Multi-Tool. Source Multi-Tool...

Swarm Keeper 0.51 7z
Alien Swarm

Swarm Keeper 0.51 7z

Apr 13, 2013 Swarm Keeper Full Version 1 comment

Minor bug fix release to resolve a potential crash for some users.

Post comment Comments  (70 - 80 of 184)
badMEDIA Jul 20 2010, 8:25pm says:

anyone know how to use an analog as the mouse in this game?
I'm using my PS3 controller, everything works except even
if I assign the mouse to my analog, A.S seems to overide it
and only allows the mouse :(

+1 vote     reply to comment
TensaZangetsu Jul 20 2010, 11:01pm replied:

did u try unplugging mouse while u have it in and can u tell me how u use ur ps3 controller cuz i wnna use mines

+1 vote     reply to comment
rorios Jul 21 2010, 12:32pm replied:

Just a question, but has anyone got this working with a controller? an if so, whats the gameplay like suing a controlling instead of a mouse of keyboard?????

+1 vote     reply to comment
rorios Jul 21 2010, 12:34pm replied:

balls I didn't mean for that to be a reply comment

+1 vote     reply to comment
Jhaxavier Jul 20 2010, 8:15pm says:

My God, this game is amazing.

+1 vote     reply to comment
operation_turkey Jul 20 2010, 7:55pm says:

Does anyone know if the difficulty sclaes correctly with the number of players? I was playing the campaign with my brother and we where forced into playing medic/technician in order to have sufficient utility, but we lacked having a balanced squad since AI players do not join, making the game very difficult even on normal.

+1 vote     reply to comment
GuNsHiP_MK_II Jul 20 2010, 3:33pm says:

epic bug hunt is epic!

my mark is 10/10

Epic battles
Cool story
Good bug designs ( original )
Epic coop play
Epic map design
Awesome bug sound
Epic All sounds
Cool Unlockables
New awesome source engine

Now we need more campagins :)

+4 votes     reply to comment
RockerFox Jul 20 2010, 8:03pm replied:

also don't forget the most important thing, its free...and it has a flamethrower

+1 vote     reply to comment
Curse231 Jul 20 2010, 1:43pm says:

i hope there will be more caimpaings

+4 votes     reply to comment
rorios Jul 21 2010, 12:42pm replied:

Not really sure how you can list whiny kids saying it's a free game so it shouldn't deserve proper feedback. If anything I would expect the whiny kids to be the ones who would want to complain about stuff they don't like in a free game. So to be honest, I'll stick with, if you don't want it, don't download it, simple as that. also, thats not really a con of the game, thats just pointing out something you hate about the community, so therefore shouldn't really be on the list. I agree constructive criticism is fair enough.

I actually love this game, it's just too bad the campaign is so short. although, I can imagine people are already working on custom campaigns for it, much like left 4 dead.

+1 vote     reply to comment
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Alien Swarm
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Released Jul 18, 2010
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348 votes submitted.

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Highest Rated (3 agree) 9/10

The fact that this game is free continues to amaze me. Alien Swarm is a top down shooter that feels like futuristic Diablo II to a large degree. You fight off hordes of aliens with your friends in order to complete missions that require teamwork skill, and sometimes a little luck. The game has RPG elements – you level up and get access to new gear, there are four character classes, and multiple characters within those classes to select. This game should be a popular addition to any LAN party or…

Aug 29 2011, 12:04am by Rodman49

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