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Super Mario: Blue Twilight (MarioWeen for short) is a homebrew, Hallowe'en themed Super Mario game that combines elements of various Mario 2D and 3D games into a new, noncommercial game that includes such niceties as a "text-based directors' commentary" and "date-activated secrets."
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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.