At the Main Menu, hold L, then B, then R. Now release B, then R, then L to bring up the code entry screen.
Now enter any of the following codes:
696924 Unlock nearly all monsters
202412 Unlock Orga
480148 Unlock all cities
661334 Technicolor mode
567980 Black and white mode
760611 11 lives
112122 Indestructible buildings
650867 No energy gain for Player one
443253 Take off life and energy bars
492877 Health regenerates
176542 View credits
097401 View version number
986875 P1 is small
971934 P2 is small
895636 P3 is small
795735 P4 is small
174204 All Players are small
843901 P1 is invincible
706149 P2 is invincible
188522 P3 is invincible
286552 P4 is invincible
505634 All players are invincible
511012 P1 deals quad damage
815480 P2 deals quad damage
212454 P3 deals quad damage
286552 P4 deals quad damage
817683 All players deal quad damage
649640 P1 Always in Rage
122224 P2 Always in Rage
548053 P3 Always in Rage
451242 P4 Always in Rage
756287 All buildings and objects are throwable
316022 All monsters are invisible
650867 One time energy
308929 Armies Are 4x Stronger
256806 Turn Military On/Off
135984 Player Indicators always On
677251 Super Energy (Constant Full energy bar) P1
435976 Super Energy P2
603696 Super Energy P3
291680 Super Energy P4
562142 No health power-ups
134615 No Mothra power-ups
413403 No energy power-ups
119702 No rage power-ups
841720 No freeze tanks
913963 Hedorah on every Level
Unlock monsters:
The other way to unlock monsters is to beat the game with certain characters.
Winning With Unlocks
Godzilla '90s Godzilla 2000
Godzilla 2000 Destroyah
Anguirus Gigan
Gigan Rodan
Megalon King Ghidorah
King Ghidorah Mecha King Ghidorah
Unlock Mecha Godzilla
Beat the game with Destroyah, Rodan, and Mecha Ghidora.
Unlock Orga:
Beat the game with all characters.
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