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First game engine optimized for 64-bit processors

First game engine optimized for 64-bit processors
Who
Valve - game development
When
October 2004
The earliest game engine to be optimised for 64-bit processors was Valve’s Source engine which debuted in October 2004 with Counter-Strike: Source . The “game engine” is the software used to craft a virtual world – a suite of tools that help designers create the core game and determine the logic and structure of the game play.