Attack mode on at all times
Press Select while playing, then hold L1 and press Circle(4x's), X, Circle(4x's) at the controller selection screen. A message will verify  entry.

Two extra Clams and fame
Press Select while playing, then hold L1 and press Circle(2x's), X(2x's), Circle, X, Circle(2x's) at the controller selection screen. A message will verify entry.

Invincible Oscar
Press Select while playing, then hold L1 and press X, Circle, X, Left(2x's), Square, R1, Down, Square(2x's) at the controller selection screen. A message will verify entry.

Replace all Pearls with Fish King coins
Press Select while playing on any level with Pearls, then hold L1 press Circle, X, Circle(3x's), X, Circle(2x's) at the controller selection screen. A message will verify entry.

Hints & Tips

Completing dance mode
In order to finish dance mode easier, press X + Circle + Triangle + Square on each arrow. It will now count as the arrow that is pointing to, even doubles. To be victorious in dancing mode, press the buttons when they get to the circle.

Avoiding enemies
When your in any chapter, to skip enemies or to swim faster, rapidly press Square.

Destroyable creatures
It is possible to destroy crabs, puffer-fish, guard fish, piranhas, electric eels, and angler fish. You are unable to destroy jellyfish, sea urchins, bus fish, and long eels.

Chapter 3: Easy pearls
If you happen to attack a puffer fish, several pearls will come out.

Chapter 9: Staying hidden
When you have to sneak around the fish with lights on their heads or the ones with torches, there are a few tables with cloths on them that you can go under without being seen.

Chapter 9: Avoid being caught
In order to avoid being caught by police fish, go into houses until the cops go by.

When you are passing through the dining room, you can only be seen by the waiters, and not the sharks. Note: Be cautious of piranhas.

Chapter 9: Easy pearls
Obtain all the clams you can find. Do as well as possible in dancing mode, and also make sure you finish the racing.