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