Cheat codes:

All divisions:
     Enter SAD CLOWN as a name.

All tracks:
     Enter LEAD TO ROME as a name.

All upgrades:
     Enter MAD HOOKUP as a name.

Stunt mode:
     Enter TURN TRICKS as a name.

Sumo mode:
     Enter YOKOZUNA as a name.

Unlock everything:
     Enter ZAKARY X as a name.

Bonus tracks and vehicles:
     Win  all  gold medals in the world tour divisions to unlock bonus
tracks  in  world  tour  and arcade modes as well as bonus vehicles in
arcade mode.