When your on the map press the R button and you will switch between Mario and Luigi
You be Luigi in New super Mario bros DS by holding L + R while choosing any save file.
In the original you can play as Mario and Luigi. In New Super Mario Bros DS you can play as MArio AND LUIGI. IN NEW SUPER MARIO BROS WII ITS MARIO, LUIGI, BLUE TOAD, AND YELLOW TOAD.
No you can play as Mario and Luigi.
ds,mario and luigi,wii mario, luigi, blue toad, and yellow toad.
2. Mario and Luigi - L+R+A (you press the buttons on the ds.)
I know that you can play as luigi on new super Mario bros for ds. You do this by holding L R and A when your chosing your profile
Only 2. Mario and Luigi
Mario and luigi, to play as luigi, hold L+R while loading a save/profile
If you play multiplayer you can! On both DS and WII!
You can not unlock Luigi in super Mario 64 without hacks, but he is playable in super Mario 64 DS
If you r talking about new super Mario u beat the game and do code and press start
press L and R and enter at the same time