The Yoshi-Go-Round's Secret
From the Super Mario Wiki
The entrance to the secret of the Yoshi-Go-Round is found by bringing an Orange Yoshi to the spot on the Yoshi-Go-Round that is lacking a Yoshi. Yoshi can be found behind the Deku Tree to the right of the pirate ship ride. By making Yoshi turn orange by having him eat a papaya or pineapple, the player needs to bring the Yoshi to the vacant spot on the Yoshi-Go-Round and Mario will be transported to the secret course. As usual, Shadow Mario will appear to take F.L.U.D.D. away during the first playthrough.
The first obstacle of the secret course is a bridge of six rotating cube platforms that Mario has to cross. Afterward are many spotted cubes, with each color of cubes moving in their own ring. Mario has to jump between the different rings in order to move through the gate in the center, as some of the gates are closed off. The blue cubes will take Mario through and he then has to cross the cubes to reach a stationary platform at the end. By jumping onto a smaller cube afterward, it will carry Mario to a structure of orange cubes that he has to Wall Jump up in order to reach the Shine Sprite at the top.
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