Do you know Super Mario Bros. 3 so well you can play it under severe duress? Like, say, pulling g-forces and flipping upside down on a roller coaster? Giant Bomb's Dan Ryckert and Jeff Gerstman recently made several loops on the Medusa coaster at Six Flags Discovery Kingdom, while playing Super Mario Bros. 3 on DS. It was a competition, naturally.
It's a glorious display of video game endurance. Possibly stupidity as well. But mostly, endurance.
