Mortal Kombat Trilogy

On player select, choose any male ninja and hold left HP HK R1 and R2 untill fighting starts. Your character should now explode into Chameleon.

LEVEL SELECT: Go to sonya at the character select screen and press up and start.
PLAY AS HIDDEN CHARACTER: Press and hold back block,high punch,high kick,run and select.

Select options from the main menu. When it comes up, hold: Up,R1,R2,L1,L2. You will now be able to access the question mark.