Hold Start and press A + B + C during game play to return to the main menu.
Enter XYZ as your initials in Grand Prix mode. This will enable all ten tracks will be in arcade mode and sixteen drones in practice mode.
Slowly drive up the hill after the first large jump. Drive through the roadblock that appears on the right side of the track. The secret track is a road with tunnels and large jumps. You will return to the original track if your car hits the side of the secret track.
Hold A + X + Y + Z at the loading screen before the a race begins. Enter the code again to return to normal mode.