Select an empty game save (to erase, press C-Up), the hold the Z button while scrolling through the letters on the name entry screen. To enter a letter, hit the L Button. Enter the following word: RRDUAL.
When you're finished, select "End" and hit L again. Now enter your name the usual way.
You now control the game with two analog sticks. Use controller ports #1 and #3, press forward on both sticks to drive and pull back to steer.