This page is for the original game. For the Source engine port, see Half-Life: Source. For the unofficial remake, see Black Mesa.
The official public demo for the game, it includes an exclusive chapter (and a training level) with content not found in the full release.
It can be downloaded here.
Note that the demo uses an older version of GoldSrc and may have compatibility issues with modern systems. For full compatibility, the SteamLink mod reworks the demo as a Half-Life mod.
A pre-release demo exclusive to OEMs, it contains the chapters from the full release up to and including "We've Got Hostiles" (5 chapters and a training level).
Note that the demo uses an older version of GoldSrc and may have compatibility issues with modern systems.
An unreleased port of Half-Life to the Sega Dreamcast, it includes various major and minor differences from the PC release (ex. modified levels, new models, adjusted difficulty, etc.)
A mod that ports the Dreamcast version as a Half-Life mod is available on Mod DB.
Use the -nointro command line argument.
The High Definition Pack was created by Gearbox and first released alongside with Blue Shift on June 12, 2001. It was released for free on Steam on August 30, 2005, with a fixed version released a year later. This pack replaces most weapon and player/enemy models with higher polygon versions, substantially altering the style of some of them in the process.
For other options follow this guide.
Use the -dev command line argument.
+developer 1 +fps_override 1 +fps_max ###
The retail version supports this feature for improved dynamic range of lighting. In the Steam version, this has been regressed since the removal of the Direct3D renderer.
connect "ip address"
-game vr -dev -env -insecure -nomouse -nojoy +sv_lan 1 +sv_maxspeed 125
This should bring the Voice and Multiplayer tabs back to your Options menu.