Godzilla: Destroy All Monsters Melee Cheats

To unlock pictures in the Gallery, you must play through Adventure
Mode on the Medium or Hard difficulty setting. Some buildings that you
destroy will reveal Silver Atari symbols. Pick these up to unlock a
picture. THIS CANNOT BE DONE ON THE EASY DIFFICULTY SETTING.

Codes
To access the cheat menu, press and hold (in this order) L, B, then R. Then release B, then R, then L. Then enter specific code for the effect that you want.
Cheat Effect
567980 Black & White Mode
661334 Technicolor mode
760611 11 Coninutes in Adventure Mode
986875 P1 is micro monster (1/3 norm. size)
971934 P2 is micro monster
895636 P3 is micro monster
795735 P4 is micro monster
174204 All Players are micro monsters
843901 P1 is damage-proof
706149 P2 is damage-proof
188522 P3 is damage-proof
286552 P4 is damage-proof
505634 All players are damage-proof
511012 P1 deals quad (4x) damage
815480 P2 deals quad damage
212454 P3 deals quad damage
286552 P4 deals quad damage
817683 All players deal quad damage
492877 Health regenerates
756287 All buildings and Objects become throwable
112122 All buildings become in destructible
316022 All monsters are invisible
650867 One time energy (Energy doesn't recharge over time, but energy weapons do more damage)
649640 P1 Always in Rage
122224 P2 Always in Rage
548053 P3 Always in Rage
451242 P4 Always in Rage
256806 Turn Military On/Off
135984 Player Indicators always On
677251 Super Energy (Constant Full energy ball) 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
225133 Unlock Godzilla 2K
616233 Unlock Gigan
877467 Unlock King Ghidorah
104332 Unlock Rodan
537084 Unlock Destoroyah
557456 Unlock Mecha King Ghidorah
131008 Unlock Mecha Godzilla
696924 Unlock all monsters except Orga
480148 Unlock all cities
443253 No Status HUD
097401 Display version of game and time of completion in the Options
176542 View Credits
202412 Unlocks Orga
913963 Smog Mode
308929 Stronger Military

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:

Here are some ways 2 get new mosters:
Godzilla2000: beat adventure mode w/ Godzilla90`s(easy lv.)
Destroyah: beat adventure mode w/ Godzila2000.(easy lv.)
King Gidorah: beat adventure mode w/ Mechalon(easy lv.)
Mecha King Gidorah: beat adventure mode w/ King Gidorah(easy lv.)
Gigan: beat adventure mode w/ porqupine dude(easy lv.)
Rodan: beat adventure mode w/ Gigan(easy lv.)
Mecha Godzilla: beat adventure mode w/ all monsters(easy lv.)
Organ dude: beat adventure mode w/ all mon.(easy lv.) then beat adventure mode w/ Mecha Godzilla(medium lv.)

Beat the game with all of the charcters to unlock Orga.

At the main menu, highlight "Versus" mode, then hold L + R + B. Release the button in this order: B, R, L. If done correctly, a white box will appear. Enter the following codes to activate the cheat function:

Code: Result:
696924 All characters (except Orga)
225133 Unlock Godzilla 2K
104332 Unlock Rodan
537084 Unlock Destoroyah
557456 Unlock Mecha King Ghidorah
616233 Unlock Gigan
131008 Unlock Mecha Godzilla
877467 Unlock King Ghidorah
480148 Unlock all cites
677251 P1 Unlimited Energy
435976 P2 Unlimited Energy
603696 P3 Unlimited Energy
291680 P4 Unlimited Energy
256806 Military On/Off
413403 No energy power-ups
562142 No health power-ups
134615 No Mothra power-ups
841720 No freeze tanks
119702 No rage power-ups
843901 P1 Damage-proof
706149 P2 Damage-proof
188522 P3 Damage-proof
286552 P4 Damage-proof
505634 All players Damage-proof
650867 P1 Power energy
492877 Slow Health regeneration
649640 P1 Rage Mode
122224 P2 Rage Mode
548053 P3 Rage Mode
451242 P4 Rage Mode
511012 P1 Qaud damage
815480 P2 Qaud damage
212454 P3 Qaud damage
286552 P4 Qaud damage
817683 All players Qaud damage
459113 P2 Invisible
316022 All monsters Invisible
986875 Tiny P1
971934 Tiny P2
895636 Tiny P3
795735 Tiny P4
174204 Tiny players
756287 Throwable buildings & objects
135984 Player Indicators On
112122 Indestructible buildings
760611 11 continues (Adventure Mode)
661334 Technicolor Mode
567980 Black and White Mode
443253 No Life & Energy bars
097401 Show Game version in Options
176542 Shows Credits

To unlock Gigan, beat the game on adventure mode with Angilas.