Bubble Bobble also featuring Rainbow Islands/Hidden content
From Sega Retro
Contents
Bubble Bobble
Original Game mode
On the title screen, press 
.
In this mode, the secret treasure room doors will always appear even if you have lost a life before reaching the correct level.
Power Up mode
On the title screen, press .
When you start the game you will permanently have the Shoes (increased speed), Yellow Candy (fast-firing bubbles) and Blue Candy (fast-moving bubbles).
Enable debug mode
On the title screen, press .
Now during gameplay, 
will skip forward a level, and 
will skip backwards.
References
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