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