30 Lives - At the title screen, press Up, up, down, down, left, right, left, right, B, A.

Max out abilities - During game, press UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, B, A. Can only be used once per level.

Sound Test Menu - Hold A+B and turn on the NES, when screen comes up press start, hold A+B until title screen then press start again.