I can't clear the missions required to play the courses in World ★. Check out Tips for Clearing World ★ Missions via the in-app notifications for some help. Related articles After clearing World 6-4, World ★ has appeared. However, it appears locked and I can't access it. Super Mario Run isn't working properly! Change in Android device support What happens if I link a Nintendo Account and then decide I want to delete the Nintendo Account? I can't hear the sound!