World Star (New Super Mario Bros. 2)

World Star (also known as World ★) is the final world that appears in New Super Mario Bros. 2. It requires 90 star coins to enter it. Dry Bowser is the boss of the castle. It can be unlocked by beating Bowser in World 6. World Star appears to be similar to World 9 and World S, as they are all bonus worlds unlocked by beating the final boss.