Unlimited Continues
At the Title screen press Y, Down, Up, L, R, R, L.

Weapon Select
At the Title screen, press Y, Down, Up, L, R, L, R. While playing, hold A+C while pressing Y to change your weapon.

Movie Test
At the Title screen press Y, Down, Up, L, R, Down.

Hidden Game 2
At the Title screen press Y, Down, Up, L, R, Right.

Hidden Game 1
At the Title screen press Y, Down, Up, L, R, Left