On a whim, T downloaded Limbo this morning, and he's been working on it off and on all day. It's a side-scroller horror game, and it's pretty fantastic so far. You play a small boy navigating a world that's all grays shading into black, fraught with peril, and the creepy atmosphere is done perfectly. A good variety of puzzles, too. He's less than halfway through, but so far I would say definitely recommended.