Double Cherry Palace
From the Super Mario Wiki, the Mario encyclopedia
Captain Toad starts next to a Double Cherry, which is a power-up returning from Super Mario 3D World. The player must use the Double Cherry to clone Captain Toad, and use them to navigate through a maze to hit two P Panels, which unlocks the back side of the castle. From here, the player needs to reach the bottom of the castle, where a two-person platform can be found. This platform will take the player up to the Power Star.
A hidden 8-bit Luigi can be found in a window on the right wall, just below the hedge maze.
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