A first-person puzzle game developed by Valve and graduates of DigiPen, Portal forces a human test subject to run a gauntlet of grueling spatial experiments administered by a malfunctioning, psychotic artificial intelligence named GLaDOS.
I'm not sure this is viral marketing. It's probably just a fan of the game putting that on his van. It looks like a fairly old van, if valve were going to do viral marketing, they'd go for a nice shiny new van. An older van doesn't exactly show it in the best light.
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