Mortal Kombat Trilogy

Secret Options:
Go into Options, then hold L1 + L2 + R1 + R2, until you hear a boom and the screen will shake. Now, the "?" is selectable.

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.

Stage Select:
Go to the character select screen and highlight Sonya, press Up + Start.

Unlimited Credits:
At the Story Screen, press Down(x2), Up(x2), Right(x2), Left(x2).

Extra options:
At the Options/Configure Kombat screen, hold Up + R1 + R2 + L1 + L2 and press Up.

 