Amnesia: The Dark Decent.
Oh nice one. What makes this game great to me is two things:
- you can't defend yourself. There is just nothing more terrifying than being defenseless
- looking at enemies and other scary stuff actually makes things worse for you!
That entire premise makes you use your environment to its fullest. In stead of rushing into a new area, the first thing you do is scout for places to hide. And the torch... It not only makes you more visible, but it runs out so quickly too... and you really need that thing to regain your sanity so you hoard it.
Its funny how a few basic limiting gameplay elements make you play the game in a very realistic manner - and enjoy it too.