Half-Life: Decay

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Half-Life: Decay
Half-Life: Decay cover
Gearbox Software
Valve Corporation
Windows Hoaxer
Release dates
Windows September 22, 2008
Modes Multiplayer
Pacing Real-time
Perspectives First-person
Controls Direct control
Genres Shooter
Art styles Realistic
Themes North America, Sci-fi
Series Half-Life
Half-Life: Decay on HowLongToBeat
Half-Life: Decay on IGDB
Half-Life: Decay guide on StrategyWiki
Half-Life: Decay on MobyGames
Half-Life: Decay on Wikipedia
Half-Life mods and fangames (series)
Half-Life 1998
Sven Co-op (unofficial mod) 1999
Half-Life: Opposing Force 1999
Half-Life: Blue Shift 2001
Codename: Gordon 2004
Half-Life: Source 2004
Half-Life 2 2004
Half-Life 2: Deathmatch 2004
Half-Life 2: Lost Coast 2005
Half-Life Deathmatch: Source 2006
Half-Life 2: Episode One 2006
Half-Life 2: Episode Two 2007
Portal (series)
Half-Life: Decay (unofficial port) 2008
Black Mesa (unofficial remake) 2020
Half-Life: Alyx 2020

Key points

Unofficial PC port of official expansion
Requires the base game Half-Life
2 player co-op game, requires one PC per player
Can be played singleplayer with bot


Source DRM Notes Keys OS
Official website
Requires Half-Life.
See here for information on setting the game up.

Game data[edit]

Configuration file(s) location[edit]

System Location
Windows <path-to-game>\Half-Life\decay\[Note 1]

Save game data location[edit]

System Location
Windows <path-to-game>\Half-Life\decay\SAVE\[Note 1]
The game has no save feature (aside from saving unlocked levels)


In-game video settings.
In-game video settings.

Graphics feature State Notes
Widescreen resolution
FOV needs to be adjusted to compensate for cropped first person view.
4K Ultra HD
UI becomes too small both in-game and menu.
Field of view (FOV)
See Field of view (FOV).
Borderless fullscreen windowed
See Borderless fullscreen windowed.
Anisotropic filtering (AF)
Steam version has this by default. Can be forced through graphics card control panel otherwise.
Anti-aliasing (AA)
Steam version has MSAA by default. Can be forced through graphics card control panel otherwise. Enhanceable to SGSSAA on Nvidia systems.
Vertical sync (Vsync)
60 FPS
120+ FPS
Enable fps_override 1 in the console.[1]
High dynamic range display (HDR)
See the glossary page for potential alternatives.

Field of view (FOV)[edit]

Field of view[citation needed]
When running at widescreen resolutions, adjusting the field of view may be necessary.

First Method:

  1. While in game, push ~, which opens the developer console.
  2. Type default_fov 106.270273206 and press Enter.

Second Method:

  1. Alternatively you can also open config.cfg located in <path-to-game>\Half-Life\Decay\.
  2. Add the following to the bottom of it.

For 16:10: default_fov 100.39487232

For 16:9: default_fov 106.270273206


If the new fov doesn't stick try creating an autoexec.cfg file in the same folder and adding the line to it.

Borderless fullscreen windowed[edit]

-window -noborder[citation needed]
  1. Find Decay in your Steam Library
  2. Right-click the game name
  3. Select Properties
  4. Select Set Launch Options...
  5. Input -window -noborder
  6. Press OK
  7. Launch the game

High frame rate[edit]

Override Max FPS[citation needed]
Game is locked at 72 FPS by default.
  1. To change this open config.cfg
  2. Change the line fps_max "72.0".


To exceed 100 fps, use fps_override 1.[citation needed]
Changing FPS may break ingame scripts.


In-game key map settings.
In-game key map settings.
In-game mouse/joystick settings.
In-game mouse/joystick settings.


In-game audio settings.
In-game audio settings.
In-game voice settings.
In-game voice settings.

Audio feature State Notes
Separate volume controls
Surround sound
Lost with Linux update.[2]
Closed captions
Mute on focus lost


Language UI Audio Sub Notes
translation based on ps2 version available for pc.


For more information, see the "Half-Life Dedicated Server" section of our GoldSrc article.

Multiplayer types

Type Native Players Notes
LAN play
2 Co-op
Online play
2 Co-op

Connection types

Type Native Notes
Direct IP
Open the console (~) and use connect followed by the IP and port.


Protocol Port(s) and/or port range(s)
UDP 6003, 7002, 27010, 27015, 27025
Universal Plug and Play (UPnP) support status is unknown.

Other information[edit]


Technical specs Supported Notes
Direct3D 7 Lost with Linux update.[3]
OpenGL 2.1
Software renderer
Executable 32-bit 64-bit Notes
macOS (OS X)
[citation needed]
[citation needed]


Middleware Notes
Audio Miles Sound System
Multiplayer Steamworks

Unlocking levels[edit]

Loading and unlocking levels if your save is bugged[citation needed]
The game is a bit glitchy and you may lose your save at times, use this to return to your previous point in the game.
  1. Go to C:\Program Files (x86)\Steam\steamapps\<user-id>\half-life\decay\maps and C:\Program Files (x86)\Steam\steamapps\<user-id>\dedicated server\de\maps
  2. Rename the levels to what you want
  3. Load the renamed level

Level order[edit]

  1. dy_accident1
  2. dy_accident2
  3. dy_hazard
  4. dy_uplink
  5. dy_dampen
  6. dy_dorms
  7. dy_signal
  8. dy_focus
  9. dy_lasers
  10. dy_fubar
  11. dy_outro
  12. dy_alien (bonus level)

System requirements[edit]

Minimum Recommended
Operating system (OS) 95, 98, NT
Processor (CPU) 133 MHz
System memory (RAM) 24 MB
Hard disk drive (HDD) 4 GB
Video card (GPU) SVGA, high color (16-bit)


  1. 1.0 1.1 When running this game without elevated privileges (Run as administrator option), write operations against a location below %PROGRAMFILES%, %PROGRAMDATA%, or %WINDIR% might be redirected to %LOCALAPPDATA%\VirtualStore on Windows Vista and later (more details).