New Super Luigi U is an expansion for New Super Mario Bros. U . It replaces Mario with Luigi as Player 1, with Blue Toad, Yellow Toad, Nabbit and Mii as playable characters. Luigi has his own abilities, higher jump and lower traction, to help him in the redesigned levels that now have increased in difficulty and start at one hundred seconds. While the levels have a major makeover, the World Map itself remains unchanged.
The retail version of the game is a standalone release that doesn't require New Super Mario Bros. U to play.
The gameplay revolves around navigating through challenging levels with unique abilities for each playable character. Players can collect coins and stars to unlock new paths, secret areas, and special powers. The game features varied terrain and obstacles, including pipes, castles, and treacherous terrain, requiring precise timing and platforming skills.