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
Half-Life: Decay guide at StrategyWiki
Half-Life: Decay at Wikipedia
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) TBA

Key points

Unofficial PC port of official expansion
Requires the base game Half-Life
2 player co-op game, requires one PC per player

General information

Official Website
Unofficial Half-Life Wiki


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)

Video settings[edit]

In-game video settings.
In-game video settings.
Graphics option Option 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.
Vertical sync (Vsync)
60 FPS
120+ FPS
Enable fps_override 1 in the console.[1]

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]

Input settings[edit]

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

Audio settings[edit]

In-game audio settings.
In-game audio settings.
In-game voice settings.
In-game voice settings.
Audio options Native Notes
Separate volume controls
Surround sound
Lost with Linux update.[2]
Closed captions
Mute on focus lost


Language UI Audio Sub Notes


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
64-bit executable
OS X and Linux only.[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 Administrator elevation, activity in %PROGRAMFILES%, %PROGRAMFILES(X86)%, and %WINDIR% might be redirected to %LOCALAPPDATA%\VirtualStore\ (more details).