Click on the ATV above the "Back" button on the Choose a Sled screen to
drive an ATV instead of a snowmobile.
Drive an Arctic Cat Sno-Pro:
Successfully complete the game twice on the hard difficulty setting to
unlock the Arctic Cat Sno-Pro sled and Blair Morgan racer.
New Vehicle:
At the sled selection screen you can race the ATV above the BACK button by
just clicking on it