Hidden Invasion

UP, DOWN, DOWN, UP, LEFT, LEFT, UP, RIGHT, RIGHT, UP, UP, UP. Enter the cheat quickly at title screen; you should hear a weird sound indicating the code worked.

Rotate Analog Pad four full rotations counter-clockwise. Enter the cheat quickly at title screen; you should hear a weird sound indicating the code worked.

LEFT, LEFT, UP, UP, RIGHT, RIGHT, DOWN, DOWN. Enter the cheat quickly at title screen; you should hear a weird sound indicating the code worked.