Superstar Road

Superstar Road is the ninth and final world of New Super Mario Bros. U and New Super Luigi U. It is similar to World 9 from New Super Mario Bros. Wii. Superstar Road is a homage to the Star World from Super Mario World. This world is accessed via a portal as this world is in deep space. The portal is on an island between Sparkling Waters and Acorn Plains and can only be accessed via a pipe after completing the game. This is the only world where two of the power-ups from New Super Mario Bros. Wii, Propeller Mushrooms and Penguin Suits, can be found. There are a total of nine levels in this world, eight of which are only accessible by collecting all the Star Coins from each world while the last one can be unlocked by completing all other Superstar Road levels with three Star Coins collected.

Boost Rush Courses

 * Hammerswing Caverns - Superstar Pack
 * Lakitu! Lakitu! Lakitu! - Superstar Pack

New Enemies

 * Big Fuzzies
 * Cheep Chomps

Trivia

 * This world, along with Rock-Candy Mines and Peach's Castle, is one of the only three worlds in the game to not have Enemy Courses.