Knight Lore: Majou no Ookami Otoko

To enable this cheat, you first need to insert an extra joystick in the Famicom's expansion port. After you've done that, hold Left on the extra joystick & Right + B + A on controller 1, then while still holding, press Right 10 times on controller 2. As an alternative, if you can somehow manage to hold both Left and Right on controller 1, then you wouldn't need that extra joystick.