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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Hey folks!

I just wanted to start by saying thanks for all the support. As you may have seen, the development of this mod has already started. I wanted to give you a few updates on the features that are currently being developed for each game mode.

I'll keep you updated on the development as soon as I can.

Meanwhile, if you want to get involved or if you have any feature requests, let me know!


Crowbar & Glock-only mode - 33%

  • Exclusive weapon classes to avoid other weapon pickup (COMPLETED)
  • Exclusive ammo classes to avoid other ammo pickup (NOT STARTED)
  • Feasibility testing - Crowbar (COMPLETED)
  • Feasibility testing - 9mm (NOT STARTED)
  • Map entity modification to make the game completable - Crowbar (NOT STARTED)
  • Map entity modification to make the game completable - 9mm (NOT STARTED)

1HP mode - 29%

  • 1hp health limit modification (COMPLETED)
  • No armor pickup and view on HUD (NOT STARTED)
  • Fall damage modification to make the game completable (NOT STARTED)
  • player first-person coat model for weapons (instead of the orange HEV) (PENDING APPROVAL)
  • modification of c0a1d to remove the HEV station (STARTED)
  • modification of HEV station during Unforeseen Consequences (NOT STARTED)
  • Feasibility testing (NOT STARTED)

Realistic mode (Current focus) - 35%

  • Bindable weapon drop mechanism (COMPLETED)
  • Mag drop mechanism - You lose your clip ammo if you recharge before empty (COMPLETED)
  • Mag drop animation (STARTED)
  • Bindable iron sight mechanism (STARTED)
  • Iron sight animation (STARTED)
  • hip fire vs iron sight precision (NOT STARTED)
  • semi-auto weapon (for shotgun, crossbow, 357, glock) (COMPLETED)
  • semi-auto and burst mode for Glock and mp5 (STARTED)
  • manual ammo reload (COMPLETED)
  • Weapon fire mechanism - Keep firing = less precise, CS-like (NOT STARTED)
  • Weapon class limit (COMPLETED)
  • Ammo weight system (NOT STARTED)
  • Ammo pick up using "E" (NOT STARTED)
  • Bindable ammo drop mechanism (NOT STARTED)
  • Damage (player & NPC) modification (NOT STARTED)
  • Slow player below X% health + breathing .wav when walking injured (NOT STARTED)
  • Bleeding mechanism - aesthetic only (NOT STARTED)
  • Auto-aim removal (STARTED)
  • Crosshair removal (NOT STARTED)
  • HUD modification - mag or item count vs. ammo count (NOT STARTED)
  • HUD modification - No health count, armor only, no weapon HUD (NOT STARTED)
  • Feasibility testing (NOT STARTED)

Permadeath - 0%

  • Add a 4th skill (NOT STARTED)
  • Remove autosave entity (NOT STARTED)
  • Remove the possibility to save (NOT STARTED)
  • Bring to main menu after death (NOT STARTED)

Half-Late Mapping - 0% - Open to collaboration

  • Build mapping roadmap (NOT STARTED)
  • Build maps (NOT STARTED)
  • Modify maps to make each game mode completable (NOT STARTED)

Screenshot 2023 12 11 at 11 49 3

357 iron sight

Half-Life : Echoes Release - Thank you

Half-Life : Echoes Release - Thank you

News 23 comments

A massive thank you to everyone who played and enjoyed my mod.

Half-Life: Echoes has been released!

Half-Life: Echoes has been released!

News 52 comments

After 20 years of enjoying everything that the Half-Life community has had to offer, I am incredibly happy to finally release my own contribution to you...

Half-Life : Echoes Release Date and Trailer

Half-Life : Echoes Release Date and Trailer

News 47 comments

Playtesting is complete. A release is imminent. Come check out the trailer!

Half-Life : Echoes final polish

Half-Life : Echoes final polish

News 30 comments

A complete version of Echoes is being play-tested for final bug testing and polish. I will be releasing soon.

Add file RSS Related Files
Half-Life: Decay v1.025 Full (Multilanguage Update)

Half-Life: Decay v1.025 Full (Multilanguage Update)

Half-Life: Decay v1.02 (De, En, Fr, It, Ru, Sp) Full Version 8 comments

Major patch for fixing most of the bugs, and adds some new elements.

Half-Life: Decay v1.024 Full (Re-Uploaded)

Half-Life: Decay v1.024 Full (Re-Uploaded)

Half-Life: Decay v1.02 (De, En, Fr, It, Ru, Sp) Full Version

This is Full version of Half-Life: Decay - v1.024. Patch version were uploaded on gamebanana (Link in a mod's description). This is the re-uploaded due...

Half-Life: Decay v1.023 Full

Half-Life: Decay v1.023 Full

Half-Life: Decay v1.02 (De, En, Fr, It, Ru, Sp) Full Version 2 comments

This is Full version of Half-Life: Decay - v1.023 (Patch version were uploaded on gamebanana).

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Half-Life Unified SDK Map Decompiler

Mapping Tool

Half-Life Unified SDK Map Decompiler by SamVanheer - is a powerful tool used to decompile Half-Life 1 BSP version 29 and 30 files. It stands out from...

Half-Life: Decay v1.022 Full

Half-Life: Decay v1.022 Full

Half-Life: Decay v1.02 (De, En, Fr, It, Ru, Sp) Full Version 7 comments

Full and patched version of Half-Life: Decay v1.022.

Half-Life: Decay v1.021 Full

Half-Life: Decay v1.021 Full

Half-Life: Decay v1.02 (De, En, Fr, It, Ru, Sp) Full Version 2 comments

Full, cleaned and patched version of Half-Life: Decay v1.021 (in case if patch will not work well).

Post comment Comments  (0 - 10 of 25)
Guest
Guest - - 699,606 comments

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BionicCoyote
BionicCoyote - - 1,255 comments

Full playthrough of the PC port w/ TheRenegadist and myself

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bxigxy
bxigxy - - 28 comments

i agree

Reply Good karma Bad karma+2 votes
LevTaylor
LevTaylor - - 534 comments

I think Decay deserves more love and also a brand new updated PC Port ;^)

Reply Good karma Bad karma+3 votes
jonatasv
jonatasv - - 54 comments

james good morning, my name is jonatas moro in brazil, and recently every day I play your hl decay with my brother on my ps2, thanks to you, I am very happy when I play this marvel of universe half life.
I come to thank you for what made this game changed my life,
I hope that someday an unofficial port of opposing force can be released for ps2.
God bless you and your family.
THANK YOU

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heady123
heady123 - - 50 comments

Thank you!!!!!! Game like Good job!

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★HECU★
★HECU★ - - 2 comments

Where button download

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elek2008
elek2008 - - 185 comments

How do I host a server?

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Cdm966
Cdm966 - - 27 comments

Ahhh. Nostalgia. :)

Reply Good karma Bad karma+5 votes
xxx3456789
xxx3456789 - - 1 comments

I Play The PC Decay...

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