Shifting-Floor Cave

Shifting-Floor Cave, or Rock-Candy Mines-7, is the seventh course of Rock-Candy Mines in New Super Mario Bros. U. It is unlocked via completion of Screwtop Tower and its own completion unlocks a red Toad House, Roy's Conveyor Castle and a path to the first point after Grinding-Stone Tower.

Layout
The course's main gimmick is mechanical platforms, referred to as "shifting floors", that push through the gears in the middle.

Star Coins

 * Star Coin 1: In plain sight, the first star coin is between a pair of shifting floors.
 * Star Coin 2: On the highest point of the level, the player must use a shifting floor to get there.
 * Star Coin 3: Directly underneath the Warp Pipe that leads to the flagpole. It can only be reached using a Koopa Shell.

Enemies

 * Spike Tops
 * Piranha Plants
 * Super Piranha Plants
 * Swoopers
 * Koopa Troopas