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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Help needed

News 5 comments

EVERYONE OR EVERY MAPPER OUT THERE !

without mappers the mod could die! and or beloved half-life source is going to be forgotten in a complete dark room where nobody will care about it !

Half-Life Echoes - One year update

Half-Life Echoes - One year update

News 11 comments

It has been around one year since I started this project. Thank you all for the support!

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 6 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...

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Sandpit v3.7.1 (ZIP)

Sandpit v3.7.1 (ZIP)

Full Version 22 comments

Fixed crash on map change (thanks SylvesterBarry@ModDB). Extract the .zip to steamapps\common\Half-Life\ and restart Steam to play.

Xash studioMDL Goldsrc Large Model Compiler

Xash studioMDL Goldsrc Large Model Compiler

Modelling Tool 3 comments

Large Model compiler for Half-Life mods by Xash-Team. for more info please click

Hi-Def Gman HL1 "Wisely done Mister Freeman"

Hi-Def Gman HL1 "Wisely done Mister Freeman"

Audio 12 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...

Half-Life Uplink

Half-Life Uplink

Demo 16 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...

Half-Life Unofficial FAQ

Half-Life Unofficial FAQ

Other

An old Half-Life FAQ, downloaded from an archived Half-Life website.

Further-Data

Further-Data

Patch 3 comments

This is Further-Data, a small bonus CD released for free in 1999 via retail channels to Half-Life players. It contains bonus audio and music, lots of...

Comments  (0 - 10 of 19)
★HECU★
★HECU★

Where button download

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elek2008
elek2008

How do I host a server?

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Cdm966
Cdm966

Ahhh. Nostalgia. :)

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xxx3456789
xxx3456789

I Play The PC Decay...

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kenter
kenter

I remember playing this on PS2.

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AymericTheNightmare
AymericTheNightmare

Yeah, me too. But quite hard in singleplayer.

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overwatchprivate
overwatchprivate

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

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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.

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AmaroqDricaldari
AmaroqDricaldari

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

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Blinding_oof
Blinding_oof

don't you mean just the PC?

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Half-Life: Decay
Platforms
PS2
Developer
Gearbox Software
Engine
GoldSource
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Sci-Fi
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Multiplayer
Project
AAA
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Expansions
Half-Life: Opposing Force
Half-Life: Opposing Force First Person Shooter
Half-Life: Blue Shift
Half-Life: Blue Shift First Person Shooter
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Half-Life
Half-Life First Person Shooter
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