There was a specific moment while playing Diffusion where it shifted from being merely a highly capable Half-Life mod to one of the most remarkable conversions of Valve's classic FPS I've ever played. It's a moment reminiscent of Xen's reveal in Crowbar Collective's remake of Black Mesa, a sense of wonder imbued in equal parts by the sci-fi vista placed before you and the fact you know that it's running on the technical equivalent of a restored 1930s sedan...
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