Clayfighter: Tournament Edition
Contributed by - Richard

Secret options menu:
Select any fighter and quickly press and hold Select + L at the
character selection screen. You'll be taken to the character selection
screen.

Tiny fighters:
Select Four-player tournament mode. Choose and name the following
fighters in this order, with "_" showing a space: 

Frosty, with POSSE as a name. 
Frosty with JASON_A as a name. 
Blob with STEVE_C as a name. 
Taffy with JOHN_S as a name. 
All four players will be smaller with game play begins.