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Bubble Bobble also featuring Rainbow Islands (commonly shortened to just Bubble Bobble & Rainbow Islands) is a compilation of both Bubble Bobble and Rainbow Islands, two popular arcade games developed by Taito in the 1980s and early 1990s. It was released for the Sega Saturn (alongside PlayStation and PC versions) in 1996.
Bubble Bobble also featuring Rainbow Islands is a curiously named game as despite suggesting Bubble Bobble is the main focus of this compilation, it is actually Rainbow Islands which receives the most treatment. Rainbow Islands exists in two forms, a largely unaltered arcade conversion and an enhanced mode, which updates the graphics to take advantage of the larger colour palette. Both share the same musical score and gameplay.
Bubble Bobble takes cues from both these versions of Rainbow Islands, being a faithful arcade conversion with some very minor graphical changes, effectively just giving the characters some shading (as opposed to Rainbow Islands which replaces backgrounds too).
Neither version of Rainbow Islands is entirely true to its arcade roots, as the theme of its first stage has been altered to sound less like Harold Arlen's "Over the Rainbow", most likely due to legal concerns which arose as the game became more popular. This altered theme was used in previous conversions for the Nintendo Entertainment System (1991) and the Sega Master System (1993).
Reportedly Taito had lost the original source code for Bubble Bobble, meaning developers Probe Entertainment had to resort to adapting the 1987 Atari ST version instead.