Unlimited continues:
Press B(3), C, A(3), B(2), C(3) at the title screen. The phrase "Free Play" will appear at the bottom of the screen to confirm correct code entry.

Invincibility:
Press A, B, A, C, B, C(2), B, C, A, B, A at the title screen.

Level select:
Press C, A, C, B, C, A, B, A, B, A, B, C, A at the title screen. The phrase "Zone Select" will appear to confirm correct code entry.

Extended high score screen:
Press A, B, C, A, B, C, A, B, C, A, B, C at the title screen.

Sound test:
Obtain a high score and enter ZZT as initials on the high score screen.

Debug data:
Press [A, B, C] four times at the title screen.

Expert mode:
Press C(12) at the title screen.

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