Shark Tale
Attack mode on at all times:
While playing a game, press Select, then hold L and press:
X(4), A, X(3) or X(4), A, X(4).
Invincible Oscar:
Hold L and press A, X, A, Left(2), Y, R, Down, Y(2)
at the controller selection screen.
Replace all Pearls with Fish King coins:
While playing on any level with Pearls, press Select, then hold L press
X, A, X(3), A, X(2).
Completing Dance Mode:
To complete dance mode easier, press A + B + X + Y on each arrow.
It will count as the arrow that is pointing to, even doubles.
Two extra Clams and fame:
While playing a game, press Select, then hold L and press:
X(2), A(2), X, A, X(2).