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Playstation 2 - Ultraman cheats

Unlock Monster World mode: 
Play in story mode and finish the game

Unlock Monster Grave mode: 
Play in Monster World mode and finish the game

Unlock Violence Rock mode: 
Play in Monster Grave mode and finish the game

Unlock Ultraman Returns mode:
Play in Violence Rock mode and finish the game with the highest score. 

Unlock Survival Mode:
Play in Ultraman Returns mode and finish the game.

Unlock Different endings:
Beat Z-Ton with physical attacks, but you can't use the Spacium Ray. 

Unlock 1st set of monsters:
Finish the game in story mode once 

Unlock 2nd set of monsters:
Finish the game in story mode two times. 

Unlock 3d set of monsters:
Play in Ultraman Returns mode and finish the game