From the Super Mario Wiki
Smashing-Stone Tower, or Rock-Candy Mines-Tower is the tower level of Rock-Candy Mines in New Super Luigi U. It is unlocked when Porcupuffer Cavern is completed, and its completion unlocks Spike's Seesaws and Light-Up-Lift Tower.
The level starts in a tower with Grrrols and multiple platforms. At one segment of the level, the player must let the Grrrols destroy some Brick Blocks to open up the rest of the level. A Dai Gorō destroys another wall of Brick Blocks which opens up the boss door where Boom Boom awaits. He must be hit three times in order to be defeated.
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