When on the options menu, use the following codes to unlock the corresponding effect:
Get All Keys: SKELETON
Invincibility: KHUFU
Perfect Manuals: QUEZDONTSLEEP
Perfect Grinds: BIGUPYASELF
Full Stats, Levels and all Park editor objects: Up, Up, Down, Down, Left, Right, Left, Right, BABA
All Characters: Down, Right, Right, Down, Left, Down, Left, Down, Right, Right, Right
Low Gravity Wallrides: Up, Down, Up, Down, Left, Right, Left, Right, ABABS
Super Spin: Left, Left, Left, Left, Right, Right, Right, Right, Left, Right, Left, Right, Up
Juice Faster: Left, Left, Right, Right, Left, Right, Down, Up, Up, Down, AI
Max Juice Bar: BAKABAKA
Master Cheat: PLZDOME