Go into Options then hold L1 L2 R1 R2 Up until you hear a boom and the screen will shake. Now the "?" is selectable.
Submitted by g halsey
Play as Classic Characters
At the character select screen highlight Rayden Jax Kano or Kung Lao and Select.
Play as Chameleon
Go to Human Smoke and hold Left R1 R2 Triangle Sqaure. When the round starts Human Smoke will become Chameleon.
Go to the character select screen and highlight Sonya press Up Start.
At the Story screen press Down Down Up Up Right Right Left Left.