Every Mario Kart game, starting all the way back to the SNES version in 1992, has a new take on Rainbow Road, a course that features a cosmic theme. The version in 2008's Mario Kart Wii, however, has been particularly interesting to speedrunners for featuring a ridiculous shortcut that requires equally ridiculous skill. This morning, a speedrunner accomplished what was seen as an impossible feat and managed to achieve an "Ultra Shortcut" on Mario Kart Wii's Rainbow Road and successfully complete the lap.
Damn. Hope to see an easier way to do this in the future.