Amnesia: The Dark Descent?
One of the scariest games?
It's different...
You have no weapons and you have to use your wits and hide.
It's scary...
It has got lots of scary sounds and everything you have to do is to...
Immerse...
It's really scary because it's different than any other horror game, this is REAL horror, like it should be!
It's not anymore scary if you see a monster and you think: "OMFGZ IM GUNNA SHUT IN DA FACE DAT ZING"
It's scary when you can't stand a chance fighting and you have to hide.
Seriously, go on steam and try the demo. And the full game is 10x scarier than the demo