To follow up on the Devil's Fork, here is the trailer for Limbo. From the Wiki:
The primary character in Limbo is a nameless boy who awakes in the middle of a forest on the "edge of hell" (the game's title is taken from the Latin limbus, meaning "edge") who then begins to seek out his missing sister.
It looks innocent, but if you watch the trailer, you can see the kid stepping on dead bodies and so gruesome deaths. It's out on the 360 via XBLA, I don't know if it's out on any other platform.
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