Via BGR:

This week, SethBling (as he is known on Twitch), beat Super Mario World in less than six minutes using what is known as the “credits warp” glitch, a glitch which has never been done on a Super Nintendo console before. By doing so, he set a new world record for the game, which he then broke again hours later.

Without getting too technical (mostly because I don’t understand it myself), Seth effectively rewrote the code of the game using in-game items in order to warp himself to the end credits without ever beating a single level. This has been done on emulators before, but never on an actual legitimate copy of the game on an SNES.

This speed attack involved SethBling’s friend, Jeffw356, disassembling the binary for Super Mario World and discovering the memory overflow exploit that was used. (Here’s the more technical explanation).