Game:

Rainbow Islands (1988)

Duration: 10:09

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18

The original Rainbow Islands theme is hidden in this game, not even playable in the sound test.

Download link: https://mega.nz/file/OY1QGTqJ#A4Z-8c1V11Lpvi-3VDbESxLOv9i9nsXbKxh909dJoTQ

The main culprit is the subroutine which starts new music at 00:0774. The first thing it does is map the requested music ID to *another* music ID through a table stored in 00:0794.
Curiously, the world music table for both the normal and hurry up versions was also changed, even though the aforemented music ID mapping would have been enough.

Normally, these are the music replacements in the table at 00:0794:
$01 ➡️ $25 (replace the Rainbow Islands theme with the Bubble Bobble theme)
$12 ➡️ $26 (same as above, for the hurry up version)
$13 ➡️ $27 (replaces the cutscene music with the title screen theme)
$18 ➡️ $25 (duplicate? Rainbow Islands theme replaced like in $01)
The rest of the music IDs play the correct sound.

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Oh, and as the video shows, this game has very generous collision detection against other enemies. You' d think I'd have enabled an invulnerability cheat code but no. A bit of close calls there when the player sprite visibly overlaps with enemies, but I don't get hit.
If only the collision detection against platform was better. Ah well.

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