In a world of clever Tetris variants, First-Person Tetris stands out for being challenging, not impossible, and fun. When you rotate the bricks, the entire screen rotates as well, so two rotations makes the bricks fall "up" -- it's mind-bending and way cool.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.