SNES Clay Fighter 2:

Random Select- At player select screen press and hold L & R

At Game Start Screen:

Secret Characters:

Butch: Hold L- X,R,A,X,R,R
Ice: Hold B- Up,L,L,L,Right
Slyce: Hold Y- L,L,Up,L,Left,R
Spike: Hold R- X,B,B,A,Y,Left,A
Peal Good: Hold Diagonal Down Left- B,Y,Y,A,Y
Sarge: Hold X- L,L,Up,Down,Left,Down
Jack: Hold Up- X,A,R,R,Y,A
Thunder: Hold Diagonal Left Up- Y,B,X,B,B,X,A

Turbo- Hold Y & Press L,L,R,Down,Left,R