Bring Yoshi and Caped Mario into Donut Secret 2. At the part near the end with the lone Koopa Troopa and a few Spinys, have Yoshi eat the Koopa, then fly up above the pipe next to the wall of red Winged Koopa Troopas. Make sure you can see the goal, then spit out the shell. Notice that the "shell" has changed to a cycling conglomeration of sprites. To get a better look, spit it inside the pipe that hangs down by spitting it out when Yoshi's mouth is up against it. Also, when you spit out the shell, the goal tape will disappear, and you can walk through the goal without clearing the course. To get the tape back, fly over the pipe and return to the goal.