Schizoslayer pointed me at the trailer for the forthcoming Unreal Tournament 3 mod The Ball. It's out on the 7th, and the trailer really looks quite exciting. It's got a mesoamerican theme to its first person puzzling, and has the vague vibe of you being a tiny person in a world of Marble Madness. Except with stress on the word "Madness". It's got that horror-movie vibe about it. For more information, you can have a look at the site, but it's best to just sink up the atmosphere from the trailer.
Ignore the "get it now" though, as you bloody well can't. But we'll forgive them, as their site features a lovely screen of an whacking-great ape.