Unlimited health

Pause game play, then press Up, Right, Down, Up, Left, Down, Right, Left.

Unlimited energy

Pause game play, then press Down, Left, Right, Down(2), Right, Left, Down.

Unlimited pebbles

Pause game play, then press Down(2), Left, Up(2), Right, Up, Down.

Level select

Hold R1 and press Square, Circle(2), Triangle, X, Triangle.