This game has been Greenlit by the Community!

The community has shown their interest in this game. Valve has reached out to this developer to start moving things toward release on Steam.

Reduction: The Alien Swarm Campaign
Platforms: PC
Sep 8, 2012 @ 12:25pm
Apr 16 @ 3:21pm
Recent Announcements View All (6)
Omega Station, come in... (Reduction Has Been Greenlit!)
C2: New Target Grid To Follow!... Reduction V3.6 Is Up!
You are a squad of "Offworld Drop Marines".

You are engaged in a war with hostile creatures in the Outer Systems.

Your tour ending, you have returned to Earth.

And now you learn the war has reached your home planet...

What will you do?

Will you hide out in some bunker somewhere and count off the remainder of your days? Will you abandon Earth (if you even can) to go live on some barren rock world, out on the fringes of the known galaxy? Or will you choose to risk your life and follow a cryptic, self-appointed, possibly insane leader on a questionable mission to save the world?


Reduction is a "story mod' (a non-canonical campaign by myself) for the game Alien Swarm (by Valve). Basically it keeps all the great Alien Swarm gameplay, units (marines and aliens), weapons and actions, but adds a new story and a new setting (in the familiar, generic starship-troopers-versus-aliens sub-genre of science fiction).

The Reduction blog is here:

Reduction is free to download and play. In order to play Reduction, you need a copy of Valve's Alien Swarm ([].


Right now there are 6 levels finished and available to play. I just finished Mission 6. It's taken me about 6000 hours so far - my Steam profile is xfunc_carter, and you can see my hours in the Alien Swarm SDK there, plus I've spent about 1000 on Source [out of my 3000+ there] building models in Propper). (Well, you could see them there... until Valve changed it to stop logging SDK hours.)

After MIssion 6, there are about 6 more to go. Then I'd like to do a prequel, a parallel and a sequel campaign.

My plan is to keep building levels and releasing them until it's finished or I'm dead.


If Reduction gets "Greenlit", I expect you could see it as a free download for Steam, as an official Alien Swarm campaign. However, with enough support (from Steam or Valve, from the Kickstarter community, from the Alien Swarm community, from whomever...)... with enough support it could be turned into a separate game, with new aliens, new soldiers, new weapons. What sets Reduction apart is its original world and story. (It may even be better as a single-player game.)
Popular Discussions View All (5)
Dec 19, 2013 @ 3:30pm
free 2 play
Nov 23, 2013 @ 10:01am
"She's alive!... I believe you... But in 19 minutes this area is going to be a cloud of vapour the size of Nebraska": Reduction: Final Words
Sep 27, 2012 @ 1:32pm
"This little girl survived longer than that with no weapons and no training." Reduction Feedback: The Gamers (and Veterans) Have Spoken...
< >
hewkii777 Jun 27 @ 10:23pm 
this NEEDS to added i don't play alien swarm that often and this would make me play it
Hammerstrong Jun 19 @ 4:13pm 
Игра впечатлила графикой и мультиплеером
MiguelASO123 Jun 17 @ 12:39am 
Can't wait.
XFunc_CaRteR  [author] Jun 12 @ 11:49am 
Well, they ask for a release date, but they ask for that info before they say what Greenlight offers, so to put it bluntly: I don't know.

If there is some way to raise production funding from the Greenlight approval then about two years.

If not... If I just have to keep self-funding, then it could take years. Sorry, but that's where it is.

We'll see what happens. I've been organizing a corporation. It depends on how much Valve is interested in it, I guess.
MiguelASO123 Jun 11 @ 6:59pm 
When will this be released?
kamillo55855 (GameMiner) Apr 17 @ 4:07am 
Flayoff Apr 8 @ 10:42am 
WE NEED IT! More campaigns please!
kazik. Mar 31 @ 8:28am 
Alien Swarm have ONLY 1 official campaign, we needs this!
Paranørmal #VivaAlemania Mar 29 @ 10:02pm 
¡It Looks good!
Фаря Mar 25 @ 4:57am 
Alien swarm needs YOU for gaining new campaign.