Pause the game and press Right, Square, Triangle, Square, Triangle, R1, L1, R1, L1, Triangle, Down.

Unlimited lives

Pause the game and press Right, Square, Triangle, Square, Triangle, X.

Control main menu screen

While you are at the main menu screen, press Circle to say "Ribbit" or Square to lick and eat the fish and bugs.

Level secret

Collect all the gold coins on a level to unlock a secret for that level.