Half-Life Decay: Solo Mission

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Half-Life Decay: Solo Mission
Half-Life Decay: Solo Mission cover
Team Solo
Release dates
Windows TBA
Modes Singleplayer
Pacing Real-time
Perspectives First-person
Controls Direct control
Genres Shooter
Art styles Realistic
Themes North America, Sci-fi
Series Half-Life mods and fangames
Subseries of Half-Life
Half-Life: Before 2013
Headcrab Frenzy! 2015
Prospekt 2016
Transmissions: Element 120 2016
Half-Life: Caged 2017
Entropy: Zero 2017
Half-Rats: Parasomnia 2017
Base Defense 2017
Half-Life 2: Year Long Alarm 2018
Halfquake Trilogy 2018
Hunt Down The Freeman 2018
Half-Life: Restored 2020
Half-Life 2: Genry's Great Escape From City 13 2020
Half-Life: Absolute Zero 2020
Requiem of Science 2022
Wilson Chronicles Early Access
Half-Life Decay: Solo Mission TBA
Lost Squad TBA
Operation: Black Mesa TBA
Hard-Life TBA

Half-Life Decay: Solo Mission is an upcoming singleplayer first-person shooter game in the Half-Life mods and fangames series.

General information

Steam Community Discussions


Source DRM Notes Keys OS
Icon overlay.png
Requires Half-Life.
A demo is available.

Game data[edit]

Configuration file(s) location[edit]

System Location
Windows <path-to-game>\decaysolodemo[Note 1]
Steam Play (Linux) <Steam-folder>/steamapps/compatdata/1874090/pfx/[Note 2]

Save game data location[edit]

System Location
Windows <path-to-game>\decaysolodemo\SAVE[Note 1]
Steam Play (Linux) <Steam-folder>/steamapps/compatdata/1874090/pfx/[Note 2]

Save game cloud syncing[edit]

System Native Notes
Steam Cloud


Video Settings
Video Settings

Graphics feature State Notes
Widescreen resolution
Main menu background is designed for 16:9 and is stretched at other aspect ratios, see the 4:3 menu fix if playing at 4:3.
4K Ultra HD
UI elements are too small at higher resolutions
Field of view (FOV)
106 horizontal by default, see the main Half-Life 1 page
Borderless fullscreen windowed
Use -window -noborder.
Anisotropic filtering (AF)
16x by default; modify with gl_ansio console variable.
Anti-aliasing (AA)
4x MSAA; disable with -nomsaa command line argument.
Vertical sync (Vsync)
60 FPS
120+ FPS
100 FPS max by default, see the main Half-Life 1 page
High dynamic range display (HDR)
See OpenGL overbright lighting on the main Half-Life 1 page to increase the rendering dynamic range.


Keyboard settings
Keyboard settings
Mouse and joystick settings
Mouse and joystick settings

Keyboard and mouse State Notes
Mouse acceleration
Mouse sensitivity
Mouse input in menus
Mouse Y-axis inversion
Controller support
Intended for single sticks like a flight stick; controllers like an Xbox 360 Controller will only use the left stick.
Full controller support
Controller remapping
Controller sensitivity
Controller Y-axis inversion
Additional information
Button prompts
Controller hotplugging
Haptic feedback
Simultaneous controller+KB/M


Audio settings
Audio settings

Audio feature State Notes
Separate volume controls
Surround sound
Closed captions
Mute on focus lost
Red Book CD audio
Will play music from disc drive if audio CD is present.


Language UI Audio Sub Notes

Other information[edit]


Technical specs Supported Notes
Software renderer
Executable 32-bit 64-bit Notes


Middleware Notes
Audio Miles Sound System

System requirements[edit]

Operating system (OS) Vista, 7, 8, 10
Processor (CPU) 500 MHz
System memory (RAM) 96 MB
Hard disk drive (HDD)
Video card (GPU) 16 MB of VRAM
Requires Half-Life to play


  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).
  2. 2.0 2.1 File/folder structure within this directory reflects the path(s) listed for Windows and/or Steam game data (use Wine regedit to access Windows registry paths). Games with Steam Cloud support may store data in ~/.steam/steam/userdata/<user-id>/1874090/ in addition to or instead of this directory. The app ID (1874090) may differ in some cases. Treat backslashes as forward slashes. See the glossary page for details.