When selecting your saved game with A, hold L and R buttons. You will play as Luigi.
you kill it
by beating the last boss
if you mean the name of the bros its Mario and Luigi but if you mean the name of the game its new super Mario bros
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
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.
mario and luigi
Well............Yes, But, you need to press L & R. That is the only way to be Luigi in New Super Mario Bros.
I don't think he can.
You be Luigi in New super Mario bros DS by holding L + R while choosing any save file.
If you have a second player with you, yes.
In select files hold down the left and right shoulder buttons and If you here Luigi saying "Luigi" then you should be able to play as him