Nine objects:
Press Up, Down, Up, Down, B, A at the "Press Start" screen. A sound will confirm correct code entry. Note: They will be refilled after dying.

Unlimited lives:
Press L(3), R(3), Right(2) at the "Press Start" screen. A sound will confirm correct code entry.

Invincibility:
Press B(2), A(2), L, R, Down, Up at the "Press Start" screen. A sound will confirm correct code entry.