The Wind Fish's Egg is the final "temple" in the Game Boy entry in the Zelda franchise: Link's Awakening. This level is empty and all the rooms are pretty much identical. There are literally NO enemies here (aside from the boss at the end). And if you don't know the right order to go through the maze of identical rooms in, you're screwed and you're lost (unless you keep going down, which takes you back to the entrance). Luckily you can just go to the library and, using a magnifying glass, you can read a book that tells you the order. You can even just look up the order on Google.
As for the music, pretty unsettling, and it gives me quite a bit of anxiety. Random volume rises, bleeps and bloops with long pauses in between. The music gets more and more sinister the more it plays, which will give you the sensation that you're on a time limit, when really you're not. Maybe the reason why this place is so empty is because the scary music scared the monsters away.
The Nintendo Switch version of the song, unfortunately is not as scary. It just sounds more bad***.
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https://www.youtube.com/watch?v=mg4qlORor9U