Rock-Candy Mines

Rock-Candy Mines is the mountainous sixth world of New Super Mario Bros. U. It is physically the smallest world and 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.

New Super Luigi U

 * A course with wooden platforms and ledges.

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

New Enemies

 * Fuzzies
 * Venus Ice Traps
 * Porcupuffers
 * Mega Grrrols
 * Bony Beetles
 * Chain Chomps
 * Bob-ombs
 * Firebars
 * Sumo Bros.
 * Missile Bills
 * Boss: Boss Sumo Bro.
 * Boss: Roy Koopa

Trivia

 * Rock-Candy Mines is the only world in New Super Mario Bros. U to have two towers, and it is the sixth world in the game. Similarly, the mountain-themed World 6 in New Super Mario Bros. is one of only two worlds in that game that has two towers, the other being the final world.
 * This is the last world where Boom Boom is fought, as Kamek takes his place in the Meringue Clouds tower, and the only world to have a Sumo Bro. as a boss.
 * The Sumo Bro. boss does not appear on top of the tower on the world map before Mario enters it. 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.