* Always access secret rooms : Before inserting your coin, at the intro screen with the curtain, press Jump, Bubble, Jump, Bubble, Jump, Bubble, Left, Start. A tone will sound.

* Black Background And Classic Music : Before inserting your coin, at the intro screen with the curtain, press Bubble, Jump, Bubble, Jump, Bubble, Jump, Right, Start. A tone will sound. The background of each room will be black and the original Bubble Bobble theme will play instead of the usual music.
Alternative Codes :
1. Left, Jump, Left, Start, Left, Bubble, Left, Start.
2. Start, Jump, Bubble, Left, Right, Jump, Start, Right.

* Game mode select : before inserting your coin, at the intro screen with the curtain, press Up, Start, Right, Jump, Bubble, Left, Start, Down. The curtain will turn blue. You can now choose between 'normal game' and 'super game'. In 'Super' mode, platforms appear in different colors, and most of the monsters are switched around (see 'Updates' above).

* Unlock Human characters : before inserting your coin, at the intro screen with the curtain, press Left, Down, Up, Jump, Right, Start, Bubble, Right. A tone will sound. You can now choose from four human characters.

* Power-up : Down, Bubble, Jump, Start, Left, Right, Left, Start. Gives running shoes, multiple bubbles, fast bubbles.