Press 1, 1, 9, 3 at the title screen to enable cheat mode:
Result - Button:
Invincibility - 4
Select sounds - 0
Play selected sound - *
Slower background scrolling - Left
Faster background scrolling - Right
Skip to next stage - Option
Faster foreground scrolling - A
Slower foreground scrolling - B
Unlimited special weapons ammo - C
Power-up gun - 1
All bomb power-ups - 2
Flag other moons completed - 3
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