All Tracks
For access to all tracks in Arcade mode, enter your initials as "YXZ".
Hidden Track
There's a hidden track in Amazon Falls. To get there, slow down while driving up the hill after the first big jump. When you see the road block to the right, turn and drive through it. You'll find a road with tunnels and huge jumps. If you hit the side, you'll be swept back to the road.
Night Driving
At the loading screen before the beginning of a race hold A + X + Y + Z. To turn it off before the next race, hold the same buttons