Extreme Sports - Platform: Dreamcast

Expert difficulty 
-----------------
Get first place on "Hard" difficulty to get the "Expert' 
difficulty setting. 

Hard difficulty
--------------- 
Get first place on "Easy" difficulty to get the "Hard" 
difficulty setting. 

Hidden course
-------------
Select the Himalaya track under the easy difficulty setting. 
Enter the "skeleton" tunnel, and turn to follow the alternate 
route to the left. Collect the medallion to unlock a hidden 
ATV course. 

Bonus trick medallion
---------------------
Under the easy difficulty setting, choose Maui. Towards the 
end of the race (snowboarding), go to the left on the last 
grind rail.