[4] The game includes cameos by other Taito characters and settings from The NewZealand Story, Darius, Space Invaders, Arkanoid, Liquid Kids, KiKi KaiKai (including Cindy, known in Japanese version as Sayo-chan and the English Pocky & Rocky games as Pocky), Yūyu no Quiz de Go!

The players must collect certain square cards with music notes inside, in order to get the 4 keys that lead to the final world or face an early false ending.

The credits (in the arcade version) show all the enemies' names, and those of characters who make cameos from other Taito games.

[6] Bubble Symphony (バブルシンフォニー, Baburu Shinfonī) is a video game soundtrack that was released on CD and published by Pony Canyon and Scitron Label on January 20, 1995 in Japan.

Bubble Symphony Original Sound Track (バブルシンフォニー オリジナルサウンドトラック, Baburu shinfonī orijinaru saundotorakku) was released by Zuntata Records and Taito Corp on July 31, 2013 in Japan.