Puyo Tunes Dailyさんのイラストまとめ

#88: Theme of Satan - Puyo Puyo '92
Composition: Masanobu Tsukamoto
Context: The music played in the cutscene prior to challenging Satan.

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#74: Circus Stage ~ It's Showtime! - Puyo Puyo~n (standard)
Composition: Unknown
Context: Skeleton T, Archan, and Kikimora's stage themes in story and battle modes.

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(2/3)

(2/2) So about that question mark...

My resource page appears to believe the 15th "original" song is actually a rearrangement of a Nazo Puyo theme composed by BA.M. I can't confirm this myself, so for now I credit Abe.

A higher quality version of the song exists in the data of other versions, but it goes totally unused, and never plays.

You can listen here.