Open All Levels:

When you are in any level press start and enter the: Right, Square, Triangle, Square, Triangle R1, L1, R1, L1, Circle.

Infinite Lives:

When you are on a level press start to pause it and then enter: Right, Square, Triangle, Square, Triangle, X bottom.

Control Main Menu Screen:

During the main menu, you can press Circle to "Rabbit" or press Square to eat bugs and fish.

Level Secrets:

Collect every coin for a level to unlock the secret for that level

The following codes are all entered at the pause screen

All Characters:

Hold Square and press Left, Right, Left, Left, Left, Up, Left, Left.

All Extras and Bonus Levels:

Hold Square and press Right, Up, Up, Down, Right, Down, Right.

Alternate Level Select:

Hold Square and press Up, Down, Left, Right, Right, Right, , Down, Left.

Level Skip:

Hold Square and press Right, Left, Up ,Up, Up, Right, Left, Left. For level skip go about 10 hops into the level and then enter the cheat!

Temporary Invincibility:

Hold Square and press Right, Left, Right, Left, Up, Up, Left, Right.