Half-Life: Decay is the the third expansion pack for the award-winning game, Half-Life. It was included as part of the PS2 version of Half-Life. Decay returns to the setting and timeline of the original story, albeit portraying the story from the viewpoint of a different set of protagonists: two scientists working in the Black Mesa Research Facility. Decay is a cooperative multiplayer game, designed to be played by two people working together to pass through the game's levels.

It was unofficially ported to PC by a group of Ukrainian developers in 2008.

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Hello everyone!

Can you believe it has been over a year since I began this mod?

So much has happened in this time. I got married, leaned to drive, and I am about to start a new job! However, the progress for my mod ever continues!

Initially upon starting a project like this, it can be difficult to understand just how involving the creative process is and how much time has to be dedicated to it. However, I have learned so much while making this, and I have enjoyed every minute of it.

Initially I planned only a handful of maps, but this has grown more than I could imagine. I could safely say I am around 2/3 of the way through this mod. I have around 17 maps, 14 of which are essentially finished aside from tweaks and balancing. I will wait until it is all complete as I feel breaking this up into separate releases will be less satisfying. I have everything plotted out however, so there is a definite structure already set up for where the story is going, and I am very excited about the ending, if it all works :p I can imagine a total of 25 or so maps in total.

A couple of things I wish to mention - due to the textures and effects present within the mod, this is designed for fairly modern machines and has only been tested in OpenGL mode. Software will not work at all as it will not run correctly. I have run it on an older laptop I have and it was playable, but had performance issues in a few areas which could distract from the game-play.

Secondly, custom music is integral to this mod, and the mod files have been set up for the steam version of Half-Life. I am entirely unsure if it will work on the original WON version, and if it did I am not sure if the music would work as they are in MP3 format and the original loaded files from a CD. Without music a lot would be lost from certain scenes!

Lastly, I have implemented a TON of secrets and easter eggs. Many original Half-Life characters have fleeting cameos, all in a way that would work with the original games. I really hope players manage to find all of these when I release! Plus - EVERY map has a G-man sighting. Some are definitely a bit tricky to find :)

Thank you all for being patient and for providing me support and compliments this whole time, you guys keep this going! :)

Also - a shout out to the beta tester collective
Betatesterscollective.com
These guys rock, everyone should use this service!

Below are some screenshots of scripted events within the mod. I have only hidden the HUD from view, but everything is from my completed maps.

Half-Life: Echoes Announcement

Half-Life: Echoes Announcement

News 27 comments

After 15 years of enjoying Half-Life, and the endless user-created content over those years, I wish to give back to the community and create my own take...

How to use detailtextures in a professional manner

How to use detailtextures in a professional manner

Level Design/Theory Tutorial 4 comments

Hello everyone and welcome to my first tutorial. Let me start with the basics: If you don't know what a detail texture is, I shall explain. Basically...

Hi-Def Gman HL1 "Wisely done Mister Freeman"

Hi-Def Gman HL1 "Wisely done Mister Freeman"

Audio 2 comments

A bit of clever editing with some Michael Shapiro lines to re-create the final words spoken in the canon ending of Half-Life, spoken by the gman: "Wisely...

Steam Splash Creator

Steam Splash Creator

GUIs 3 comments

This little tool allows you to create custom menu backgrounds for your Half-Life games.

Epic huge props pack for goldsource!

Epic huge props pack for goldsource!

Models Pack 2 comments

(I do not own any of this, i just modified some of them) I hope this helps goldsource developers, but know that you can't use this for commercial purposes...

Half-Life: Decay Low-Def Pack

Half-Life: Decay Low-Def Pack

Models Pack 2 comments

After seeing some pictures of the beta version I decided to port the original models, with exception the Doctor Keller and Barney are re-textured due...

Hev charger & health charger from Half-life Decay

Hev charger & health charger from Half-life Decay

Prop Model 9 comments

those 2 models with they're animations, they're not made by me, they have animations and a retexture could make them look better, but im not going to...

Half-Life Uplink

Half-Life Uplink

Demo 13 comments

This is one of the two demos released for Half-Life. The first one, called Day One, was just shipped with certain video cards and never released to the...

Comments  (0 - 10 of 17)
elek2008
elek2008

How do I host a server?

Reply Good karma Bad karma+1 vote
Cdm966
Cdm966

Ahhh. Nostalgia. :)

Reply Good karma Bad karma+4 votes
xxx3456789
xxx3456789

I Play The PC Decay...

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kenter
kenter

I remember playing this on PS2.

Reply Good karma Bad karma+4 votes
AymericTheNightmare
AymericTheNightmare

Yeah, me too. But quite hard in singleplayer.

Reply Good karma Bad karma+2 votes
overwatchprivate
overwatchprivate

i want to play this so badly. Ive played every half life single and multiplayer except this one

Reply Good karma Bad karma+4 votes
SpeedyClaude
SpeedyClaude

is there singleplayer support for decay???
Or a bot sistem

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tschumann
tschumann

Yes, the mod comes with a bot.

Reply Good karma Bad karma+4 votes
AmaroqDricaldari
AmaroqDricaldari

If only Valve had it officially ported to PC and Mac and if there was a Singleplayer component.

Reply Good karma Bad karma+9 votes
RangerC
RangerC

someone should fix the Header.

Reply Good karma Bad karma+2 votes
ytres
ytres

Fixed.

Reply Good karma Bad karma+2 votes
sappy_nirv_bg
sappy_nirv_bg

hardly, it's still stretched as hell, it doesn't matter if it's different pic.

Reply Good karma Bad karma+2 votes
RangerC
RangerC

250kb.com

Here is one who has the resolution of a default ModDB banner.

Reply Good karma Bad karma+3 votes
ytres
ytres

Still stretched... I suck at creating banners, so if someone can make me a nice one (950x150), please do so.

Reply Good karma Bad karma+4 votes
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Half-Life: Decay
Platforms
PS2
Developer
Gearbox Software
Engine
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Half-Life: Opposing Force
Half-Life: Opposing Force First Person Shooter
Half-Life: Blue Shift
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