Wait for the Mortal Kombat 3 copyright screen to appear. On Controller
One hold R1 and press Right, Down, Left, Up, Right, Down, Left, Up.
This takes you to a screen where you can enter the code. On Controller
One, press R1 once, Triangle six times, Circle nine times, and X six
times. Now you can play as Smoke.
Special Options Screen:
At the trademark screen, press Square, X, Circle, Triangle, R1, R1,
R2, R2, R1, R1. You should hear Shao Kahn say, "You will never win."
Then press Up when the screen with the spinning MK 3 logo on the cube
that says "Kombat" is onscreen. A question mark appears. Utilize this
option for a plethora of cheats, including playing as Smoke and
unlimited credits.
Sites: