At the Title screen press Y, Down, Up, L, R, R, L.
At the Title screen, press Y, Down, Up, L, R, L, R. While playing, hold A+C while pressing Y to change your weapon.
At the Title screen press Y, Down, Up, L, R, Down.
At the Title screen press Y, Down, Up, L, R, Left.
At the Title screen press Y, Down, Up, L, R, Right.
At the title screen Press Y, DOWN, UP, R, L, L R there should be a noise.
At the Title screen, press Y, Down, L, R, Up.