Superstar Road - Super Mario Wiki, the Mario encyclopedia

Superstar Road is the ninth and final world of New Super Mario Bros. U, New Super Luigi U, and New Super Mario Bros. U Deluxe. It is similar to World 9 from New Super Mario Bros. Wii. Superstar Road is an homage to Star World from Super Mario World, while its name references the Star Road-esque portal

Mario, Sonic Wiki Zone

New Super Mario Bros. U Deluxe - World 9 Superstar Road (100%)

Luigi, MarioWiki

Unlockables - Mario Party Superstars Guide - IGN

Free: Super Star - Super Mario Wiki, the Mario encyclopedia

Bowser, Mario Wiki

Mario, Heroes Wiki

New Super Mario Bros. U, Nintendo

Unlockables - Mario Party Superstars Guide - IGN

Superstar Road-9 Follow that Shell! - New Super Mario U Guide - IGN

Waluigi - Super Mario Wiki, the Mario encyclopedia

Super Acorn - Super Mario Wiki, the Mario encyclopedia