Sound Test
When entering a high score, enter "ZTT" to see the Sound Test screen. To exit, press Reset.
Play Data Screen
At the title screen, press A, B, C, A, B, C, A, B, C, A, B, C.
Level Select
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.
Harder Game
At the title screen, press C twelve times.
Free Play
At the title screen, press B, B, B, C, A, A, A, B, B, C, C, C.
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