Playing Prey at the moment. Super-cool puzzle where you're trapped inside a cube. Even the construction of the cube beforehand was a really impressive intro to it. Looked like something from that Cell demo! Anyway, the puzzle reminded me a lot of the cube-logic puzzles found at http://www.totallygame.com/game.php?type=game&id=2116
Great fun to be doing it from *inside* the cube. Wish they had more like that in games!!