“So this is very, very stamina-intense,” said a commentator watching the Stepmania run at Awesome Games Done Quick 2016 yesterday. “On really hard songs... you actually become mentally tired as well. It’s not just your hands. You actually get tired.”

What followed was one of the craziest things I’ve ever seen someone do with a video game. This run of the open-source rhythm game Stepmania, performed by the superhuman speedrunner Staian, is a must-watch. Skip to around 18:00 if you just want to see the craziest parts.

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