Source 2004

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Source 2004 is the original build of the Source engine that Half-Life 2, Half-Life: Source and Counter-Strike: Source shipped with. It was succeeded by the Source 2006 engine branch with the release of Half-Life 2: Episode One.

No current Valve titles hosted on Steam use this branch, and it is outdated.

One game, Vampire: The Masquerade – Bloodlines, currently on Steam, still run on the custom version of the engine that was similar to the Half-Life 2 Beta leak, but with proprietary texture format and BSP version 17, aswell as being the first Source game to use Bink for it's startup video, and another game, SiN Episodes, likely used the last?^[confirm] build of Source 2004, or possibly early version of Source 2006 previously used by Half-Life 2: Lost Coast combined with Source 2004 code^[confirm], which contains few commands which was related to the HDR Rendering that was non-functional ("mat_hdr_enabled").

Availability and Games that uses the Source 2004 branch

Source code for this branch is no longer available.
Most Valve games introduced with Source 2004 are now currently using Source 2013 Singleplayer or Source 2013 Multiplayer.

Here are the games that currently runs on Source 2004, or previously runs on prior to it being upgraded to newer branches: