At the main menu, highlight "Versus" mode, then hold L + B + R (in that order), then release B, R, L (in that order) to display the cheat entry screen. Enter one of the following codes to activate the corresponding cheat function:

All cites

Enter 480148 as a code at the cheat menu to unlock all cites. If you entered the code correctly, you will hear a sound.

All monsters

Enter 696924 as a code at the cheat menu to unlock all monsters except Orga. If you entered the code correctly, you will hear a sound.

Play as Destroyah

Enter 537084 as a code at the cheat menu to unlock Destroyah. If you entered the code correctly, you will hear a sound. Alternately, successfully complete adventure mode on any difficulty setting with Godzilla 2000 to unlock Destroyah.

Play as Gigan

Enter 616233 as a code at the cheat menu to unlock Gigan. If you entered the code correctly, you will hear a sound. Alternately, successfully complete adventure mode on any difficulty setting with Angilas to unlock Gigan.

Play as Godzilla 2000

Enter 225133 as a code at the cheat menu to unlock Godzilla 2000. If you entered the code correctly, you will hear a sound. Alternately, successfully complete adventure mode on any difficulty setting with Godzilla 90's to unlock Godzilla 2000.

Play as King Ghidorah

Enter 877467 as a code at the cheat menu to unlock King Ghidorah. If you entered the code correctly, you will hear a sound. Alternately, successfully complete adventure mode on any difficulty setting with Megalon to unlock King Ghidorah.

Play as Mecha Godzilla

Enter 131008 as a code at the cheat menu to unlock Mecha Godzilla. If you entered the code correctly, you will hear a sound. Alternately, successfully complete adventure mode on any difficulty setting with Mecha King Ghidora to unlock Mecha Godzilla.

Play as Mecha King Ghidorah

Enter 557456 as a code at the cheat menu to unlock Mecha King Ghidorah. If you entered the code correctly, you will hear a sound. Alternately, successfully complete adventure mode on any difficulty setting with King Ghidorah to unlock Mecha-King Ghidorah.

Play as Orga

Enter 202412 as a code at the cheat menu to unlock Orga. If you entered the code correctly, you will hear a sound. Alternately, successfully complete adventure mode with all characters once, then complete adventure mode again on any difficulty setting with Godzilla 2000 to unlock Orga.

Play as Rodan

Enter 104332 as a code at the cheat menu to unlock Rodan. If you entered the code correctly, you will hear a sound. Alternately, successfully complete adventure mode on any difficulty setting with Gigan to unlock Rodan.

Eleven continues

Enter 760611 as a code at the cheat menu to get eleven continues in adventure mode. If you entered the code correctly, you will hear a sound.

Indestructible buildings

Enter 112122 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

All buildings and objects are throwable

Enter 756287 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Health regenerates

Enter 492877 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Energy do not recharge, but energy weapons do more damage

Enter 650867 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Toggle military

Enter 256806 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Technicolor mode

Enter 661334 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Black and white mode

Enter 567980 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player indicators always on

Enter 135984 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Disable life and energy display

Enter 443253 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

No health power-ups

Enter 562142 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

No Mothra power-ups

Enter 134615 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

No energy power-ups

Enter 413403 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

No rage power-ups

Enter 119702 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

No freeze tanks

Enter 841720 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

View credits

Enter 176542 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

View version number

Enter 097401 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player one invincible

Enter 843901 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player one always full health

Enter 677251 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player one super strong

Enter 511012 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player one always in rage mode

Enter 649640 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player one small

Enter 986875 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player one no energy gain

Enter 650867 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player two invincible

Enter 706149 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player two invisible

Enter 459113 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player two always full health

Enter 435976 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player two super strong

Enter 815480 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player two always in rage mode

Enter 122224 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player two small

Enter 971934 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player three invincible

Enter 188522 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player three always full health

Enter 603696 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player three super strong

Enter 212454 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player three always in rage mode

Enter 548053 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player three small

Enter 895636 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player four invincible

Enter 286552 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player four always full health

Enter 291680 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player four always in rage mode

Enter 451242 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

Player four small

Enter 795735 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

All players invincible

Enter 505634 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

All players invisible

Enter 316022 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

All players super strong

Enter 817683 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

All players small

Enter 174204 as a code at the cheat menu. If you entered the code correctly, you will hear a sound.

-Some codes from: adperez@bay.csuhayward.edu