Max Stats
Hold Right & L1, then press Triangle, Triangle, C, Triangle

Perfect balance
Up, Down, Circle, Triangle, Up, Down, Circle, Triangle, Up, Down, Circle, Triangle.

Master Code
Highlight the "Options" selection at the main menu. Then, hold L2 + Left and press Triangle, Square, Triangle, Circle, Triangle. All cheats will be unlocked.

All characters goals and boards
Highlight the "Options" selection at the main menu. Then, hold R2 + Right and press Triangle, Square, Triangle, Circle, Triangle. Note: This also unlocks the two secret characters.

All Movies
Hold Left + R1 and press Triangle, Triangle, Circle, Triangle.