All Cars, Tracks, Difficulties
     At  the  Mode  Selection  screen,  press  L,  Z, R, C-Up, C-Down,
C-Left, C-Right, Start. If done correctly, you will hear a chime.

Alternate Colors
     At the Stats screen, select a ship and press R or Z.

Smaller Racers
     At the Ship Selection screen, hold L + R + C-Up + C-Down + C-Left
+ C-Right.

Larger Racers
     At  the  Ship  Selection screen, hold L + R + Z + C-Up + C-Down +
C-Left + C-Right.

Preview Ship
     At the Customization screen, press C-Up, C-Down, C-Left, or C-Right.

Preview Track
     At the Track Selection screen, press C-Up, C-Down, C-Left, or C-Right.