Debug Mode - American
Go to the options menu. Highlight the DIP Switch option. While highlighted, press and hold X + B + Z. Here is the hard part. While holding these, hold the down button. When the cursor goes down the screen, press the C button on the DIP switch menu as the cursor goes to the top of the screen again. It might take some practice to get this code right. Finally, if you did the trick correct, there will be another option at the bottom of the DIP switch screen. It is called Debug and you must turn it on.
Free Experience
For free experience, enable the 99 Continues code, then reset the game while playing. The Experience menu will appear. The downside? Each use of this trick costs one continue.
Status Boxes
With the debug code activated, pause the game and press L. Unpause and there should be boxes surrounding the characters. A red box means that area of a body is not necessarily attacking, but is dangerous to touch. A blue box is a normal state. A green box is a blocking state. Press L again for three-dimensional boxes, and press it a third time to get rid of them.