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Playstation 2 - Savage Skies cheats

God mode
First pause the game and enter 
Left, Left, Right, Right, Up, Up, Up, Up, X, Up, X 

Crystal
First pause the game and enter 
Left, Left, Right, Right, Left, Up, Right, Down, Left, X, X

Complete all objectives
First pause the game and enter 
Left, Left, Right, Right, Down, Down, Down, Up, Down, Down, X

Unlock creatures
Go to the main menu and enter
Left, Right, Left, Left, Right, Right, Right, X 

Unlock multiplayer levels
Go to the main menu and enter
Left, Right, Left, Left, Right, Left, Right, X