To access the cheat menu do the following:
1. Finish FIRST PLACE in Saturn Mode" 4 times in a row.
2. Each time you win, enter the initials "OPT"
Once that's done, press Up, Down, Down, Up at the start-up menu
and choose a 2-player game.
At the main menu highlight ARCADE and hold X+Y+Z. When you enter
arcade mode you'll see the title of the songs at the bottom of the
track selection screen. Change it to whatever you want.
At the "Select Transmission" screen, press Up, Up, Down, Down, Left,
Right, Z, Y. When the game begins, all players will be riding sheep!
At the Mode Select screen, press L + R + X + Y + Z for a super bike.
The timing on this can be tricky, so be sure to press all the buttons
simultaneously. If that doesn't work, press Y, Z, Right, Left, Down, Down, Up, Up.
On the arcade transmission select screen press L, L, R, R, Left, Right,
Left, Z, Y, Z. Wait for the time to run out and when you start the bike you have
should be grey and the rider should have a Tantalus logo on his back.