Level Select: Pause the game, and press Right, SQUARE, TRI, SQUARE, TRI, R1, L1, R1, L1, CIR. The words "All Levels Open" should appear at the bottom of the screen. Start a new game, and you can select any level.

Infinite Lives: Pause the game, and press Right, SQUARE, TRI, SQUARE, TRI, X. The words "Infinite Lives On" will appear at the bottom of the screen. When you unpause the game, you'll have unlimited lives.