Control main menu screen
During the mainmenu, you can press Circle to "Ribbit" 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.
Infinite lives
hold Square and press Down, Down, Up, Down, Right, Down, Up, Up
OR
press Right, Square, Triangle, Square, Triangle, X.
Level Select
Hold Square and press Up, Down, Left, Right, Right, Right, , Down, Left.
OR
press Right, Square, Triangle, Square, Triangle, R1, L1, R1, L1, Triangle, Down.
Level skip
hold Square and press Right, Left, Up Up, Up, Right, Left, Left.
Temporary invincibility
hold Square and press Right, Left, Right, Left, Up, Up, Left, Right.