Cheat codes:
Enter the following four digit numeric codes in the cheat codes box at the top right corner of the "Advanced" page under the "Properties" item. Some of the codes will not work if entered after game play has started.

Unlimited credits
Enter 2509 to enable the free play (unlimited credit) selection on the options screen. Enter 9052 to disable the code.

Player one invincible
Enter 1971. Enter 1791 to disable the code.
Player two invincible
Enter 1515. Enter 5151 to disable the code.

Player one extra damage
Enter 0708 to have player one's attacks cause more damage. Enter 8070 to disable the code.

Player two extra damage
Enter 3366 to have player two's attacks cause more damage. Enter 6633 to disable the code.

Quick game
Enter 4774 to complete the game after one CPU opponent is killed. Enter 7447 to disable the code.

Easy fatalities
Enter 1037 to enable a fatality when HP + LK is pressed. Enter 7301 to disable the code.

Fight as Grox
Enter 3871 to allow player one to fight as Grox. Enter 1783 to disable the code.

Fight as Exor
Enter 9021 to allow player one to fight as Exor. Enter 1209 to disable the code.

Toggle framerate
Enter 5721 to toggle the framerate display.