From RWP Wiki
The boss of Dino Domain is Tricky the triceratops. In his races, the player must beat him to the top of a spiraling mountain, avoiding trees and boulders and being trampled by him. He holds the first piece of the Wizpig Amulet.
Key Door Challenge
In Diddy Kong Racing the player must play the Fire Mountain battle minigamne. Winning this challenge gives the player the first piece of the T.T. Amulet. The key to this door is located in Ancient Lake.