Ok so Zoombinis has no right sounding this good for a 1999 educational puzzle game. The soundtrack covers four regions and each one gets its own escalating arrangement as the difficulty ramps up. "Deep Dark Forest" starts off mysterious and slightly creepy but by its hardest version it's genuinely tense.
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"Who's Bayou" does that swampy, slightly funky thing that just sticks in your head for days. The way "Mountains of Despair" builds dread with each difficulty tier is honestly clever sound design. And "Zoombiniville" at the end.
That little victory theme hits different when you actually earned it. If you played this as a kid and forgot how good the music was, go back and listen right now.