Classic Mortal Kombat Press Select when choosing Rayden, Jax, Kano, or Kung Lao.

Level Select Highlight Sonya and press Up+Start.

Play as Chameleon Choose any Male ninja, and press and hold <+ R1 + R2 + Square + Triangle until the match begins.

Random Character Select Press and hold Up+Start on the Character Select screen.

One-Button Fatalities Hold up, L1, L2, R1, R2 at the Options menu until the screen shakes. Access the Green "!" Menu. During gameplay, press the proper button during gameplay. (Thanks to Armysting@aol.com)