June 17, 2014 12:25 AM EDT
I thought the majority of HL1 (NOT HL2) was pretty scary considering that it wasn't really a horror game per se, especially at the end when you have to go through the portal. Also there were parts of Dark Souls that made me just want to sit at firelink shrine and never leave, and I'm not even talking about the difficulty. New Londo Ruins freaked me out, those ghosts were just perfect, they could walk through walls and everything. You never knew when something was going to reach through the walls and skewer you.
Also, another DS one, the Tomb of Giants. The extreme darkness was almost unbearably claustrophobic, I was only able to make it through after resigning myself to the fact that something absolutely terrible was going to happen to me, and I might as well get it over with. I was right .
EDIT: Oh and +1 for the KOTOR 2 reference, I first played it when I was much younger and man, Peragus terrified me lol. It was probably the first "serious" game I had ever played, I just wasn't really prepared for it. All those bodies, that ambiance, and all those holotapes (yes I viewed every one) really built up the suspense. Oh, and invisible assassins. Ah, nostalgia.