This is a video of Super Mario World lover and speedrunner PangaeaPanga blasting through the game in 23 minutes WHILE BLINDFOLDED. He only dies a handful of times. For reference, I can't even figure out which way to hold the controller while blindfolded. I tried playing the original Super Mario Bros while blindfolded once and wound up walking through a screen door and falling off my balcony.
Keep going for this video, as well as PangaeaPanga beating the hardest Super Mario World level ever created, which he actually made, and took three years to finally beat.
Thanks to dogD, who wants to see him do it again but this time blindfolded AND wearing oven mitts.