New Super Mario Bros. U Blind Walkthrough Part 27: Unstable Surfaces

Two levels in a row that will have you hopping around to keep yourself safe!

Oh and the 3rd star coin's location in the castle is brilliant! You'll see...

-Time Stamps-

0:00 Rock-Candy Mines-7 - Shifting Floor Cave
7:30 Rock-Candy Mines-Castle - Roy's Conveyer Castle

Enjoy!