ATV
From the Main Menu, hold R and press Up, Right, Down, Up, Right, Down. If you entered the code correctly, the screen will flicker. Select any snowmobile to begin the race with the ATV.
Hill climb, more snowmobiles, more tracks
Win the 500cc class to unlock the hill climb, more snowmobiles, and additional tracks. Note: You can finish first in at least two races and second in the other two races.