At the title screen, press A, B, C, A, B, C, A, B, C, A, B, C.

When entering a high score, enter "ZTT" to see the Sound Test screen. To exit, press Reset.

At the title screen, press B, B, B, C, A, A, A, B, B, C, C, C.

At the title screen, press C twelve times.

At the title screen, press C, A, C, B, C, A, B, A, B, C, A, C. The words "Zone Select" should appear at the bottom of the screen.