Shiftier Boo Mansion is a level of World Flower in Super Mario 3D World. It can be unlocked by completing Faster Fort Fire Bros., and its own completion unlocks Blast Block Skyway. It is the sixth level of the area, and its basis is Shifty Boo Mansion. Unlike its base counterpart, it is completely drained of colour, making things harder to see.
The Green Stars have their locations changed.
- Green Star 1: Behind the Big Boo at the very start of the stage.
- Green Star 2: Jump on the couch that is just past the picture frame in the first area, ride the couch up to the top to find a secret area, then cross the clouds to find the star.
- Green Star 3: This is found at the third room's final segment, behind a Big Boo and on top of the end of a conveyor belt that leads to an Abyss.