Cheat mode:
Press A, C, Up, B, Up, B, A, Down at the main menu. An option for
a "Cheats" menu with continues, sound test, and biography selections will appear.

Secret menu:
Press B, A, Down, Left, A, Down, C, Right, Up, Down at the main
menu. An option for a "Secrets" menu with timer, ending story, and starting level selections will appear.

Killer codes mode:
Press C, Right, A, Left, A, Up, C, Right, A, Left, A,
Up at the main menu,. A new menu option with quick finishing move, fight as Smoke, fight as Bosses, and Galaxian mini-game options will appear.

Endurance mode:
Highlight the "Start Game" option on the main menu. Hold A + B + C and press Start. Press Start, then press Left and Right to choose a character for each box or press B to choose a random character for the current box. Hold Up and press Start to for all random characters.

Fight as Smoke:
Press A, B(2), A, Down, A, B(2), A, Down, Up(2) after the bell rings at the Mortal Kombat 3 logo.

Fight against Smoke:
Press A(2), C(3) on controllers one and two at the versus mode screen. The winner of the first round will fight Smoke.

Secret stage:
Defeat Shao Kahn to display a message stating that you are the new MK3 champion. Press Start on the controller that was not used to defeat Shao Kahn. The two player selection screen will appear with "-" displayed as the next level. Continue game play to fight on the screen that states you are the next champion. Note: Using an uppercut during this match will result in the fight ending with no winners. Defeat your opponent without
using any uppercuts to fight Shao Kahn again.

Always defeated with fatality or brutality:
Lose a single player match and hold Down on controllers one and two. Your opponent will end the match with a fatality or brutality.