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Playstation 2 - Under The Skin cheats

Unlock bonuses:
Finish the entire game once

Extra versus mode levels:
Finish the following stages to unlock new modes.

Unlock Banzai in versus mode: Finish the Tombland stage. 
Unlock Chowlow in versus mode: Finish the Spaceland stage. 
Unlock Daio in versus mode: Finish the Bioland stage. 
Unlock Dangun in versus mode: Finish the Westernland stage. 
Unlock Kurione in versus mode: Finish the Pirateland stage. 
Unlock Majinai in versus mode: Finish the Horrorland stage. 
Unlock Manitron in versus mode: Finish the Casinoland stage. 

Unlock Hard Mode:
Finish the game in normal mode with an "A" rank

Unlock Master Itazura:
Finish the game on any difficulty mode 

Unlock Cosmi Sr.:
Finish the game as Master Itazura