I'll start by saying that underwater levels tend to creep me out sometimes, especially in games from the N64/Playstation era and beyond. On the ground, all you have to worry about is what is around you and above you. However, underwater, danger can come from any direction. Not to mention that some forms of aquatic life, whether based on reality or fiction, can be downright scary. From that eel in Super Mario 64 to the gringills of Super Mario Galaxy 1 & 2, water levels have always been places I've dreaded to go.

Yep. Giygas is almost always a frontrunner in these kinds of topics. :P

I looked these up on Youtube. The rope music is quite chilling. The wrench is kinda unsettling, too. I like how they gave the knife a Psycho-like theme.

I haven't gotten around to playing Super Metroid yet, but I've played the original Metroid. It's amazing how you can feel that sense of isolation even in a game that old. Coming back to the overworld after a long journey through a lair is like a breath of fresh air.

Actually, I would like to play that. I enjoy games with a creepiness factor. :-D

There were so many scary things in OOT: Big Skulltulas, Stalchildren, ReDeads, Dead Hands, Wall Masters, Like Likes, the Shadow Temple, etc.

And Majora's Mask could probably count as a horror game on its own. lol. And this game had scary eels, too, in the depths of Pinnacle Rock.

Those can be scary, as well, especially when the two are combined. Darkness + underwater = NOPE.

Clanker creeped me out at first, too, until I learned he was friendly. It doesn't help that you come out of the pipe right in front of him. What's worse is that, if you swim to the point right before he starts talking to you, he has an animation where it looks like he's trying to eat you.

And I hated the sea hats in Wind Waker. The ocean's battle music doesn't help matters: