The Suffering. I like the easier controls compared to what I get in most horror games, even if jumping around like a jackrabbit is more hilarious than scary. The atmosphere is downright fantastic, but when the actual monsters appear, it's not as scary. But sweet crap, the jump scares are top notch, hinting at how fucked up the prison really is. One of the few times jump scares aren't stupid.
Spoiler warning: