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