Shifty Boo Mansion
From the Super Mario Wiki
Shifty Boo Mansion, otherwise known as World 3-3, is the third course of World 3 in Super Mario 3D World. It is unlocked via completion of Snowball Park, and its own completion unlocks Pretty Plaza Panic.
Shifty Boo Mansion additionally appears in the background in Super Mario Maker 2, in the Ghost House theme of the Super Mario 3D World style.
The level starts in a hallway filled with Boos and a Big Boo, followed by some steps which lead to another Boo infested area with a door. The door leads to a bookshelf-filled room which leads to the Checkpoint Flag and another staircase area filled with Boos. A nearby door leads to an outside area with some Peepas and another door, which leads inside once again. Another step-filled area awaits, followed by a door which leads outside. Some Peepas and Big Boos await, followed by a fake Goal Pole. Some nearby steps lead to the real Goal Pole.
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