If u want to know how to be Luigi I will tell you. First u finish the game than u go to to the profiel menu and u hold L and R as u open u profiel and u will see Luigi. If u save when u play as Luigi it won't work so u have keep on holding L and R everytime u want to be Luigi and to be Mario just do not hold L and R just do what u always do just go on. I hope this works for u because it works for me. THIS IS ONLY FOR NEW SUPER MARIO BROS AND NEW SUPER MARIO BROS 2 NOT ANY OTHER GAME.