Super Mario Bros. is one of my favorite games of all the time and even when I’m very good at it, I don’t think I’d be able to beat a level without looking at the screen. But hey, the internet is teeming with talented people who are willing to do things you can’t, like this guy. Basically, someone challenged him to complete a Super Mario Bros. level (they were playing the Super Mario All-Stars version of the game) without looking at the screen. Not only did he accept the challenge, but he also managed to reach the end of the level almost totally unharmed.
I guess the trick to do this is to jump a lot, without falling into the pits and without running into any of the incoming enemies. Basically, don’t die and you’ll be fine.