Mario Kart 64/Wario Stadium

Start the race - with or without the boost (with it makes it harder to hit the shortcut) - jump when you are getting really close to the left side wall. Hop when you feel to, one or two times, try to hit the angled wall "/" and jump when you get close to it - you can also release the slide and try to hit the wall straight to it. As soon as you land shroom into the right side wall and start a left facing slide (this is the harder part), hop once if necessary to hit the wall near the top of the little hill (in the middle or a little after it). Before jumping let the slide go like a kart-length before hitting the wall, jump when you get close to it just like you did on lap 1. Repeat for laps 2 and 3 to get a time easily under 30 seconds and possibly under 15.