ClayFighter 63 1/3
Stage Select
In the two-player mode, when the versus screen comes up, press Right C or Left C to change the stage you will fight in.
 Stage Select
 Hidden Characters
 Random Select
 Different Color
Hidden Characters
In addition to its unusual cast of regular characters, Clay Fighter 63 1/3 also has some nifty hidden characters. All of the following codes are entered at the character selection screen:
To Play As Dr. Kiln
At the character select screen, hold L and press B, Left C, Top C, Right C, Bottom C, A, to release Dr. Kiln.

To Play As Sumo Santa
At the character select screen, hold L and press A, Bottom C, Right C, Top C, Left C, B, to release Sumo Santa.

To Play As Boogerman
At the character select screen, hold L and press Up, Right,Down, Left, Right, Left on the Control Pad, not the Control Stick, to release Boogerman.

Secret Options Menu
At the character select screen, hold L and press Top C, Right C, Left C, Bottom C, B, A, to enable a secret menu in the options screen.

Random Select
Hold down the L and R buttons simultaneously at the character selection screen and a random clay fighter will be chosen for
you.

Different Color
In order to choose your clay fighter's alternate color, just press Bottom C (instead of the A button) to select your character.