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