Superstar Road

Superstar Road is a world in New Super Mario Bros. U, after you finish the game. If you gather all the Star Coins in any other world, then you will have access to a level depending on which world. The Toad Houses in this world also contain items that could not be accessible before, the Propeller Mushroom and the Penguin Suit. It is a spiritual successor to the previous secret worlds and Star Roads alike.