You can not unlock Luigi in super Mario 64 without hacks, but he is playable in super Mario 64 DS
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.
You be Luigi in New super Mario bros DS by holding L + R while choosing any save file.
No you can play as Mario and Luigi.
Link is not a character in Super Mario 64 DS. The available characters are Yoshi, Mario, Luigi, and Wario.
When your on the map press the R button and you will switch between Mario and Luigi
Yoshi: M = Mario L = Luigi W = Wario Mario: M = Yoshi L = Luigi W = Wario Luigi: M = Mario L = Yoshi W = Wario Wario: M = Mario L = Luigi W = Yoshi
Mario, Yoshi, Luigi, and Wario
ds,mario and luigi,wii mario, luigi, blue toad, and yellow toad.
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2. Mario and Luigi - L+R+A (you press the buttons on the ds.)
you can unlock luigi detective.