More Turbo:-  To raise the Turbo up to ten stars, go into the "Options" and highlight "Turbo." With "Turbo" highlighted, enter the following: X, X, Right, A, Z. You should hear a sound. Now, you can crank the speed
up to ten stars for a real fast fight.

Clean Pause:-  To eliminate the darkening effect and the word "Pause" from the screen when the game is paused, go into the "Options" and highlight "Screen Size." With "Screen Size" highlighted, enter the following: 

A, C, Y, Y, Up. You should hear a sound. Now, when you pause the game the screen will be crystal clear.

Appendix Mode:-  At the title screen, go into the "Options." Once in "Options," highlight "Configuration," and quickly press B, X, Down, A, and Y. A new option "Appendix" will appear below "Configuration." Now you can
change the number of rounds, color, and even full animation.