I've been playing this Japanese freeware game recently called Yume Nikki. Its basically about a girl named Madotsuki and you can explore her dreams. The thing is though, her dreamscape is incredibly huge and contains numerous unsettling situations, such as encountering crazy bird ladies, melty-faced ghosts and phallus-shaped monsters that like to rub poles and stare at you.
Anyways, its probably one of the most unique gaming experiences I've ever had and I recommend that everyone should play it at some stage of their lives. I'M SERIOUS