To access the cheat menu, you have to be on the main screen. Scroll down to the bottom of the list. Press and hold L2, then CIRCLE, then R2 in that order, then let go of CIRCLE, R2, L2. Enter the following codes:

• 525955: All Monsters
• 659996: All Cities
• 812304: Buildings Indestructible
• 122574: Energy does not regenerate
• 536117: Health comes back
• 259565: Player 1 does 4x damage
• 819342: Player 1 has Infinite Energy
• 531470: Player 1 is Invisible
• 338592: Player 1 is Invulnerable
• 927281: Player 2 does 4x damage
• 324511: Player 2 has Infinite Energy
• 118699: Player 2 is Invisible
• 259333: Player 2 is Invulnerable
• 500494: Player 3 does 4x damage
• 651417: Player 3 has Infinite Energy
• 507215: Player 3 is Invisible
• 953598: Player 3 is Invulnerable
• 988551: Player 4 deals 4x damage
• 456719: Player 4 has Infinite Energy
• 198690: Player 4 is Invisible
• 485542: Player 4 is Invulnerable

Submitted by - Stainless_delorean

To unlock Space Godzilla, King Gidorah and Jet Jagaur beat the game two times with Megalon and 90’s or 2000 Godzilla.

Beat the game on the hard difficulty setting.