Ending
To see the game ending, press and hold Up, A, B, Select, Start, and press Reset. If done right, you'll see the ending.
Reset Battery RAM
Press and hold the A and B buttons on controller 2 and press Reset.
Select 'Course' Course
During a World Championship, highlight the "LAP" menu option, hold Right + B on Controller 2, and then press A on Controller 1 to select the Machine, which is not available during normal games.
Select 'Machine' Course
During a World Championship, highlight the "LAP" menu option, hold Up + A on Controller 2, and then press A on Controller 1 to select the Machine, which is not available during normal games.
Skip Race
During gameplay, press Down + Select on Controller 1. This ends the current race with the worst results, though... However, if you hold A + B on Controller 2 during the qualifying race, you will complete it with the best result ever: 00:00:00. But you can't get this best result during regular championship races.
Easy Cash
When you start the game, go to 'create'. From there, make three characters and put them into the group. Take the new characters' gold, weapons, and armor, and give them to the old character, then save. Restart the game and erase the new characters. Repeat until you're filthy rich.