Things You'll Need
Instructions
Play "Super Mario Galaxy" at least once. Save your game.
Begin playing "Mario Kart." Complete 50 races. After the 50th race, you'll receive a message saying that Rosalina has been unlocked.
Achieve a "Gold" ranking, or three stars, on the first three "Grand Prix" modes. This will unlock the "Mirror Mode" option.
Race in the eight different "Mirror Mode Cups." Get a rating of at least one star on each race to unlock Rosalina.