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.

Greenlight is being retired. For more information on how to submit games to steam, refer to this blog post.
Reduction: The Alien Swarm Campaign
Platforms: PC
Sep 8, 2012 @ 12:25pm
Apr 16, 2014 @ 3:21pm
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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 (6)
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
Oct 11, 2014 @ 9:45am
Is it still alive?
< >
dmguerra44 May 9 @ 7:53pm 
So sad to read about his demise, RIP. He was working in an awesome project. Really sad news
[CMA] Benjamin Apr 27 @ 3:42am 
My brother's and i played this in the memory of him, Tim thank you for the awesome map pack RIP mate :)
El Chaffinch Dec 18, 2016 @ 9:13am 
put your focus on Alien Swarm Reactive Drop instead
鬼蜮天使 Dec 1, 2016 @ 3:46am 
Remember Tim!!!!!!!!
Spiral Oct 23, 2016 @ 11:57am 
It is with a heavy heart that I have to announce that Tim has passed away. I am a friend of the family and attended his memorial service today. They spoke of his passions, his brilliant creativity, and the darkness inside that took him from us. His sister mentioned this game specifically. Please pause a moment to remember Tim.
R.I.P. Lil Peep Sep 4, 2016 @ 3:11am 
Dev was lastly online 49 days ago, is he dead?
R.I.P. Lil Peep Sep 4, 2016 @ 3:07am 
Is this going to release on Steam?
Dr. Kaiser Aug 10, 2016 @ 8:08pm 
why is it that the best games are the ones that never get to be public?
The real Jordan8tor Feb 3, 2016 @ 2:37pm 
gonna release anytime soon?????!
Vexatious Jan 20, 2016 @ 5:48pm 
OMG please let this happen this is one of my favorite games please please this game could such a calssic or just hugely popular with just a little more to it.