Amnesia: The Dark Descent, a first person survival horror. A game about immersion, discovery and living through a nightmare. An experience that will chill you to the core.
With no doubt, The dark descent achieved the most dark and terrorific ambient of games in the last decade, thing lot's of AAA games never achieved.
While having not over the top graphics (sometimes just average), and a bit of hardcore gameplay or unintuitive puzzles, the excellent narrative and atmosphere of the game make you go and go on to end of the story.
Amazing experience for all publics.