Enter the following codes at the 'Cheats' screen: 

citybeacons     Win everything
inflatedego     Big head mode
iwish           Unlimited time   
tearound        Always win
travolta        Power-up moves 



Hints

Hidden Shortcut on Japan Race 1: 
The shortcut is where a section of the railing is out. Go straight through it & land
straight. This shortcut could show the word "Wrong Way" but you have taken a jump
from the broken rail.

Shortcut in Usa Race 1: 
Ride around the track & when you see the corner that has a broken rail, Ride straight
through the open shortcut & you won't need to go around the corner again.