Unlock Everything:
——————

Go to options menu and press the left trigger until you get to the cheat
code menu. Then scroll down until you get to „Career Completion”.
Press X with „Career Completion” highlighted. Then enter in the word CLAPPEDOUT.
Now you have everything unlocked including all machines, bikes, gear, riders,
tracks, and THE FAMOUS. . . 50 CC bike! Have fun! ;)

Cheats:
——-

Enter these at Cheats Screen in the Character Completion field:

MINIGAMES – Unlock all machines
STUPERCROSS – Supercross tracks
ECONATION – National tracks
BIGDOGS – 500cc bikes
SQUIRRELDOG – 50cc bikes
CLAPPEDOUT – Get all bonuses
BUSTBAG – Freestyle tracks
OBTGOFAST – Expert AI
WRECKINGBALL – AI Bowling
SWAPPIN – Pro Level Physics