Source 2004
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Source 2004 is the original build of the 
Source engine that 
Half-Life 2 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 No current Valve titles use this branch, and it is outdated.
Availability
The following games are still based on Source 2004:
SiN[confirm]
Vampire: The Masquerade – Bloodlines
