For this to work perfectly you need at least one star to go upstairs and to the room with a 1 on it or the character room. When you enter look for a glass window of P. Peach on the right side.Jump in it to go to a secret level wich is called Princesses secret slide.1st star you get it at the end of the slide. 2nd staris when you get to the end in less that 21 sec. this will take more than 2 times.3rd star is when you get all 80 coins. It doesnt always work for the third one so good luck!