To activate a cheat, enter its code during the game.

• Race at high speed -- L1 + Right, R1 + Down, Square, L1 + Triangle, R1 + Down, L1 + Left, Select
• TV camera -- Circle, L1 + Triangle, L1 + X, Triangle, R1 + Up

To unlock stunt mode, collect all 10 track coins in circuit mode.

To race as Granny, finish first in circuit mode at "Pro" difficulty. This will also unlock planet x and the ramp park

Just finish first in novice circuit. Then when you go to trophies and look at the novice pin you can turn fixed camera on or off.