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Gamecube - Shark Tale cheats

Chapter 3: Easy pearls:
Attack the puffer fish. You can pick up many pearls.
To win in dancing mode, press the buttons when they get to the circle.

Shorties: 
If you can't beat them, try to following Shorties.

Destroyable creatures:

You can destroy:
crabs, puffer-fish, guard fish, piranhas, electric eels, angler fish. 

You cannot destroy:
jellyfish, sea urchins, bus fish, long eels.

Insuperable Oscar:
Hold L and press A, X, A, Left,Left, Y, R, Down, Y,Y at the controller selection 
screen.

Complement all Pearls with Fish King coins:
While playing on any stage with Pearls, choose Select, then hold L press 
X, A, X,X,X A, X,X.

2 extra Clams and fame:
During the game play, choose Select, then hold L and press 
X, X, A, A, X, A, X, X.

Attack mode always:
During the game play, choose Select, then hold L and press X, X, X, X, A, X, X, X 
or X,X,X,X, A, X,X,X,X.