Valve is offering a free weekend to explore the world of The Ship, a kooky shooter set on a cruiseliner that the marketing folks have dubbed "a massively mysterious thriller (MMT)." The $20 game is online only, though developer Outerlight is almost done with a single-player story mode that will be available only at retail. If online shooters are your thing, play The Ship now for free until 1 p.m. PST Sunday ...
