The Hotel Lobby's Secret
From the Super Mario Wiki
The entrance to the secret course is in the hotel, so the player needs to talk to the hotel manager to be let in. Once inside, the player needs to spray the Pink Boos floating around the central pillar which will transform them into platforms Mario can jump on. By using the platforms, the player can reach the top floor of the hotel, where a statue of a Big Boo known as the Golden Boo can be found on top of the pillar. Jumping into the mouth of the Golden Boo will transport Mario to the secret course, and Shadow Mario will appear to swipe F.L.U.D.D. away.
The first part of the secret course has several large Brick Blocks. In order to cross the large gaps ahead, Mario has to jump on the Winged Strollin' Stus that move across and use them as platforms to reach the other side. Afterward is a tall wall covered in Brick Blocks. The player has to Wall Jump up the sides of the wall while breaking the blocks in order to move forward. After the wall are two paths made up of Sand Blocks; the player has to quickly cross one path of Sand Blocks before they disintegrate. Both paths will lead to a structure made up of various blocks, and Mario has to Ground Pound the second Watermelon Block in order to move forward (or Mario can fall off the opposite end and Ground Pound once he gets near the gear platform at the bottom). Once Mario stands on the gear-shaped platform, it will begin rotating while moving forward, and will lead to a pyramid of Sand Blocks. Behind the Sand Blocks is a platform with a single Strollin' Stu and the Shine Sprite.
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