During the countdown, press and hold the accelerate button right after the "2" stops spinning to start the race with a short burst of speed.

To quickly get back up to speed after falling off the course, press and hold the accelerate button right as Lakitu places you back on the track. If your timing is true, you'll get a short burst of speed.

To unlock your Mii as a racer, get gold trophies in all four cups of one speed class.

Get a gold trophy in the 150cc Mushroom Cup to unlock Daisy.

Get a gold trophy in the 150cc Flower Cup to unlock Wario.

Get a gold trophy in the 150cc Star Cup to unlock Rosalina.

Get a gold trophy in the 150cc Special Cup to unlock Metal Mario.

Get a gold trophy in the 150cc Shell Cup to unlock Shy Guy.

Get a gold trophy in the 150cc Banana Cup to unlock Honey Queen.

Get a gold trophy in the 150cc Leaf Cup to unlock Wiggler.

Get a gold trophy in the 150cc Lightning Cup to unlock Lakitu.

Get a gold trophy in every 150cc cup to unlock Mirror courses.