This Portal player can beat the game in less than ten minutes, with many levels flying by in mere seconds. How can a Portal speed run happen so fast? Break Portal apart at the seams, of course.

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This sprint through Valve's first-person puzzler is a combination of speedy backwards jumping, slipping through cracks in the world and screwing with Portal's rules. It's a great watch, even if you spend most of your time looking at elevator doors, wondering "How the hell did he just do that?!"

DemonStrate - Portal Done Pro - Speedrun - 9:25.567 - WR [YouTube via PC Gamer]