Rock-Candy Mines

Rock-Candy Mines is the mountain and sixth world of New Super Mario Bros. U. It lies east of Acorn Plains, Sparkling Waters, and Soda Jungle, southeast of Layer-Cake Desert, Frosted Glacier, and Meringue Clouds, and south of Peach's Castle. Rock-Candy Mines is a world filled with tall, pillar-like mountains in somewhat irregular shapes. The name is derived from rock candy. There are ten levels in this world, with seven normal levels, two Towers and the Castle level. The boss of this world is Roy Koopa.

There are multiple ways to enter this world. One is to complete Iggy's Volcanic Castle, Soda Jungle's castle, normally. The other two are to complete Fliprus Lake or Skyward Stalk, Frosted Glacier and Sparkling Waters' secret levels, respectively.

Levels

 * Rock-Candy Mines-1: Fuzzy Clifftop: This level features Yoshi, Berries and Fuzzies.
 * Rock-Candy Mines-2: Porcupuffer Falls: A cliff level over the water, where Porcu-Puffers attack.
 * Rock-Candy Mines-Fort Icon.png: Grinding-Stone Tower: Boom Boom's tower, featuring infinite grinding-stone enemies.
 * Rock-Candy Mines-3: Waddlewing's Nest: This level features Chain Chomps, Waddlewings and tilting stands.
 * Rock-Candy Mines-4: Light Blocks, Dark Tower: A dark cavern filled with giant Glow Blocks.
 * Rock-Candy Mines-5: Walking Piranha Plants!: A mountain inhabited by Stalking Piranha Plants.
 * Rock-Candy Mines-6: Thrilling Spine Coaster: A dark cave level with a poison water lake and Spine Coasters.
 * Rock-Candy Mines-Fort Icon.png: Screwtop Tower: Boss Sumo Bro.'s tower. It contains Firebars and spinning screw platforms.
 * Rock-Candy Mines-7: Shifting Floor Cave: This underground level is filled with moving iron blocks and elastic bars.
 * Rock-Candy Mines-Castle Icon.png: Roy's Conveyor Castle: Roy Koopa's castle. It's full of conveyor belts and steel crates.

Challenge Mode Original Courses

 * Balancing Act - Special (Original Course)
 * Dark Dark Coaster - Coin Collection
 * Mini Mountaineer - Time Attack (Original Course)
 * Screwtop It Up - Time Attack
 * Swing Into Action - Time Attack

Boost Rush Courses

 * Fuzzy Clifftop – Yoshi Pack

Trivia

 * Rock-Candy Mines is the only world in New Super Mario Bros. U to have two fortresses.
 * This is the last world where Boom Boom is fought, as Kamek takes his place in the Meringue Clouds fortress, and the only world to have a Sumo Bro. as a boss.
 * The Sumo Bro. boss does not appear on top of the fortress on the world map before Mario enters the tower. He does appear briefly after his defeat, though.
 * This world, along with Peach's Castle and Superstar Road, are the only worlds in the game to not have Enemy Courses.