In the ghost level, be Mario and go up the stairs to the place where there is ghost books and a red coin on a turning platform. Hit the block and get fat. Go up and there is a platform and a door. Go in the door and there is Luigi's picture.
*This is also the way to beat big boo's balcony and another level I forget the name.*
Give me two double quarter pounders, three milkshakes, seven hotdogs, twelve large fries, three large onion rings....and a diet soda. I'm on a diet.