For people and teams developing mods and games with Valve's Source engine.

Report article RSS Feed Alien Swarm SDK is free to all

A new UDK! Valve have launched their new SDK without access restrictions, allowing TC Source mods to become totally free – no purchase necessary.

Posted by Varsity on Jul 19th, 2010

Perhaps ironically for a game that started out on the Unreal Engine, Alien Swarm has turned out to be Valve's response to the Unreal Development Kit. It isn't quite as tidy a package as UDK - as a Steam account and 2GB download are required before mods can be played - but it's pretty close, and Steamworks fills in the indie licensing side of the equation. Like UDK however, there is a limited supply of content: Source's standard HL2 materials, models and sounds are not available.

In related news, Swarm documentation has gone up on the Valve Developer Community. Included is a guide to mapping (with the new TileGen as well as in Hammer), and a C++ code overview.

TileGen screenshot

Oh yeah: the game is out too.

Post comment Comments
Maxen1416 Jul 19 2010, 7:36pm says:

when they increased the time by 3 hours i was like WTFMFFHS!!

+14 votes     reply to comment
Dan911 Jul 19 2010, 7:51pm replied:

dito lol

+2 votes     reply to comment
BenQ3000 Jul 20 2010, 2:05am replied:

I Was more like OMGWTFBBQ but yeah it was pretty close.

+7 votes     reply to comment
hogsy Jul 20 2010, 6:29am replied:

I blew my head off in response...

+2 votes     reply to comment
Cremat0r Jul 20 2010, 7:30pm replied:

I smashed my head on the table, but, well, it's out!!!

+2 votes     reply to comment
YeOldePoop Aug 5 2010, 11:08am replied:


+2 votes     reply to comment
Henley Staff
Henley Jul 19 2010, 7:38pm says:

Massive news!

+5 votes   reply to comment
Herr_Alien Jul 20 2010, 3:22pm replied:

Well, developers still don't get the right to redistribute the runtime. You can't say the same about Unity or UDK ...

+2 votes     reply to comment
MrMattWebb Jul 19 2010, 8:03pm says:

Through some discussion, it seems that current Source mods do not port over to this SDK. Shame. This "SDK" seems a bit gimmicky. We wont be seeing any AS total conversion for a long time.

0 votes     reply to comment
gtaiiilc Jul 19 2010, 8:27pm replied:

true I dought any TCs but I give it 2 or 3 months before the UT04 campaign and maybe few of it's mods are recreated

0 votes     reply to comment
SteveUK Jul 19 2010, 8:57pm replied:

Not even true. If it's based off HL2 then you maybe in trouble, but otherwise it might not be a problem.

Stripping out lobbies and matchmaking will be the hardest part. I was hoping they would port over the SDK template to make that a little bit easier and gives a barebones thing to work with.

+2 votes     reply to comment
MrMattWebb Jul 19 2010, 9:05pm replied:

Its a completely different code base from the HL2 code base therefore, even TC's dont transfer over.

+3 votes     reply to comment
SteveUK Jul 19 2010, 10:45pm replied:

Yes they do. All the default Source stuff is there (CBase* classes), just not all the HL2/HL2DM source files. Most multiplayer TCs should be using the template as a base anyway.

+1 vote     reply to comment
DuckSauce Jul 20 2010, 7:04am replied:

Not every TC starts off a TC though.(Jailbreak is the first to come to mind, it started as a simple hl2mp mod, it did have a "restart" when 0.5 went bad... so maybe...)

Anyway downloading the SDK before even bothering with the game :P

+2 votes     reply to comment
Varsity Author
Varsity Jul 20 2010, 1:16pm replied:

That is no different to UDK.

-2 votes   reply to comment
Sgt.JokenJoker Jul 19 2010, 9:04pm buried:


is there gonna be a beta?

-16 votes     reply to comment
211476 Jul 19 2010, 9:40pm replied:

Get it on Steam dude, no beta

+15 votes     reply to comment
Armageddon104 Jul 19 2010, 9:30pm says:

So we just hit create mod in the alien swarm SDK and we can make a TC of it and sell it? To bad it has to be coop and top down I'm guessing...

+1 vote     reply to comment
211476 Jul 19 2010, 9:35pm replied:

I'm pretty sure that the camera postion can be changed, coop too.

+2 votes     reply to comment
Blandr3ws Jul 20 2010, 2:04am replied:

yeah lol, that's like saying the orig sdk only allowed fps - it's up to you to change it. and the codes in the old codebase if it's not in the new one

+5 votes     reply to comment
ytres Jul 19 2010, 9:37pm says:

**** yea.

+4 votes     reply to comment
LordIheanacho Jul 19 2010, 11:17pm says:


+3 votes     reply to comment
sbnewsom Jul 19 2010, 11:43pm says:

Cool, but not amazing. UDK still gives the developers the ability to sell their product for a low royalty price.

+1 vote     reply to comment
Varsity Author
Varsity Jul 20 2010, 1:16pm replied:

So does Steamworks.

+5 votes   reply to comment
Gunship_Mark_II Jul 20 2010, 2:15am buried:


Lol map editor like in FPSCreator or GameMaker XD

-6 votes     reply to comment
MrTambourineMan Jul 20 2010, 8:46am replied:

It has a vanilla hammer as well...

+3 votes     reply to comment
Cypher05 Jul 20 2010, 6:49pm replied:

Perhaps you should do some research?... You get source code (client, server, missionchooser), SDK (model viewer, hammer, face poser, that "FPSCreator" over the top map editor...) This is far from a FPSCreator or GameMaker. That's just insulting.

+3 votes     reply to comment
DuckSauce Jul 20 2010, 7:49am says:

My first mod experience with it...


+3 votes     reply to comment
freredarme Jul 20 2010, 8:46am says:

Nice, downloading now !

+2 votes     reply to comment
Kamikazi[Uk] Jul 20 2010, 9:22am says:

This game is sweet, not checked out sdk yet but i will be playing with it soon :D.

+2 votes     reply to comment
xXMaNiAcXx Jul 20 2010, 9:48am says:

Awesome game, too bad my processor sucks and I get 10fps on it hahaha

+2 votes     reply to comment
skarai Jul 20 2010, 11:04am says:

It's ok. No fun enemies. Weapons same old, same old.

-1 votes     reply to comment
infl1ct1on Jul 21 2010, 8:52am replied:

I agree. Couldn't play it more than 10-15 minutes without becoming incredibly bored.

-1 votes     reply to comment
Analdin Jul 20 2010, 11:22am says:

I'm waiting for all the good HL2 mods to be ported to Alien Swarm! XD

+2 votes     reply to comment
Soul_linker Jul 20 2010, 2:33pm says:


+2 votes     reply to comment
josemlopes Jul 20 2010, 3:23pm says:

That map editor looks incredibly close to the map editor from the Time Splitters games.

+2 votes     reply to comment
SamVision Jul 20 2010, 3:42pm says:

OMFG Valve is awesome!!!!!!1111!!!111one

+2 votes     reply to comment
gelal1000 Jul 20 2010, 4:21pm says:

i love this game :D
Ensim jjajajaj the game is very good because the gameplay is friendly fire and kill the bugs when they break into chunks:)

+2 votes     reply to comment
Noesis_Interactive Jul 20 2010, 4:29pm says:

So Sweet!

+2 votes     reply to comment
casualties1000 Jul 20 2010, 5:13pm says:

How do you create the Alien Swarm maps? Hammer is the regular source hammer.

+2 votes     reply to comment
Kadersalad Jul 21 2010, 3:29am says:

Who Is up For Making Crap....WOO HOO

+4 votes     reply to comment
Nikholai-Chan Jul 21 2010, 6:30am says:

Epic game, epic SDK and more epic times to come when the public start releasing content :D

+2 votes     reply to comment
RickTheStickman Jul 21 2010, 7:41pm says:

I bought Half-Life 2 because of the SDK a day before it released.
Still an amazing game.

+2 votes     reply to comment
TheGangstaAlan Jul 26 2010, 10:31am says:


+3 votes     reply to comment
Post a Comment
click to sign in

You are not logged in, your comment will be anonymous unless you join the community today (totally free - or sign in with your social account on the right) which we encourage all contributors to do.

2000 characters limit; HTML formatting and smileys are not supported - text only

Nov 9, 2007
Open to all members
Send Message
Members Only
Join this group
Group Watch
Track this group
Report Abuse
Report article
Related Games
Alien Swarm
Alien Swarm Single & Multiplayer Arcade
Related Engines
Source Commercial Released Oct 31, 2004
Related Groups
Source Developers
Source Developers Fans & Clans group with 980 members
Valve Developer & Publisher