My vote goes for Tomb Raider II and the floating islands levels. The game is a relativity normal globe trotting affair for Lara until she gets transported into the fucking shadow realm here. This level gave me major scares as a kid since you’re traversing a giant void being chased by animated statue warriors out to kill you.
The Shalebridge Cradle in Thief: Deadly Shadows is to this day one of the most unexpectedly pants-shittingly frightening sequences I’ve experienced in a game.
on that note don’t know if VTMB counts as a horror game, but goddamn that hotel level fucks with me no matter how much i know that i’m supposed to be the scary thing in the dark
it is impressive that they managed to give people playing as immortal creatures of the night the willies