All Tracks, Cars, Difficulties At the mode selection screen, press L, Z, R, UpC, DownC, C, Start.
Alternate Colors Select a vehicle, then press R or Z.
Ghosts Beat the time attack levels in a certain time (very difficult to do) to unlock the ghost.
Joker Cup Beat Jack, Queen, and King on Standard.
Large Racers At the vehicle select screen, press and hold L+R+Z+UpC+DownC+C.
Leader's Time Press L to see how far ahead or behind you are.
Master Difficulty Beat Jack, Queen, King, and Joker on standard.
New Title Screens Beat the game on Expert for a new title screen. Beat it on Master for another new title screen.
Rotate Cars At the customization screen, press the C buttons.
Plasma Spin During gameplay, press R+Z repeatedly.
Smaller Cars At the car selection screen, press and hold L+R+UpC+DownC+C.
Wiggling Ships At the car selection screen, press R+L+