Hold L, B, R. Release B, R, L. A code entry box appears. Use the D-pad to choose numbers, and use A to continue.
567980: Black & White Mode
661334: Technicolor mode
760611: 12 continues
986875: Player 1-Micro Monster
971934: Player 2-Micro Monster
895636: Player 3-Micro Monster
795735: Player 4-Micro Monster
174204: All are micro monsters
843901: Player 1-Immortal
706149: Player 2-Immortal
188522: Player 3-Immortal
286552: Player 4-Immortal
505634: All players are immortal
511012: Player 1-Quad Damage
815480: Player 2-Quad Damage
212454: Player 3-Quad Damage
698206: Player 4-Quad Damage
817683: All players deal quad damage
492877: Health Regenerates
756287: Everything Throwable
112122: Buildings Indestructable
316022: Monsters are Invisible
650867: One-time Energy
649640: Player 1-Always in Rage
122224: Player 2-Always in Rage
548053: Player 3-Always in Rage
451242: Player 4-Always in Rage
256806: Turn Military On/Off
135984: Player Indicators on
677251: Player 1-Super Energy
435976: Player 2-Super Energy
603696: Player 3-Super Energy
291680: Player 4-Super Energy
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
612633: Unlock Gigan
877467: Unlock King Ghiodorah
104332: Unlock Rodan
537084: Unlock Destoroyah
557456: Unlock Mecha King Ghiodorah
131008: Unlock Mechagodzilla
696924: All beasts but Orga
480148: Unlock all cities
443253: No status HUD