From the Super Mario Wiki
Porcupuffer Cavern (Porcu-Puffer Cavern in the PAL version), or Rock-Candy Mines-2, is the second level of Rock-Candy Mines in New Super Luigi U. It is unlocked when Mount Fuzzy is completed, and its completion unlocks Smashing-Stone Tower.
The level starts outside near two ? Blocks, a Huckit Crab, and Warp Pipe. The Warp Pipe leads to a cave with a Porcupuffer chasing the player. Note Blocks and a pole can be found, followed by three ? Blocks. The middle ? Block contains either a Super Mushroom or an Ice Flower, depending on the player's current form. Four more poles can be found above Note Blocks above a water pit. can be used to navigate through the level. A Huckit Crab is found on a platform, with a Red Ring nearby. More Note Blocks are above the water, followed by another pole. A Huckit Crab is found on a platform with three Brick Blocks above it. Two more poles then follow. A Huckit Crab is found, along with a Warp Pipe, which leads the player to the Goal Pole.
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