Sanitarium is a (rare? only?) game that you travel in a psychedelic dream after having a car accident, and explore and interact with a surreal world full of craziness and fear.

Some points that I love are:
- It has a solid narrative that, somehow and in a clever way, it's all connected within the game
- The dialogues are spoken, giving you the real sense of the emotions of the characters
- It's a puzzle game, not an action game
- It's not a scary game. It plays with your emotions in a real phycological horror experience
- The avatar and the worlds transforms in the game, making you feel a real psychedelic dream
You can buy it here:
http://www.gog.com/game/sanitarium
Hope you guys find it attractive as I do.