Well, if that's the case, I'm sure they have a windows version of Adventure somewhere. I don't see why you need to practice your vi skills. The thing about vi is, you either feel the use for it, or you use microsoft word or (gasp) Emacs (which is probably also available in windows for some reason or another). If you get sick of playing adventure and still want to practice your vi skills, check out another Unixy game: Nethack. Remember: "j" moves you down, "k" moves you up, "l" moves you right, and ";" moves you left. No need to use the escape key.
Correction. "h" moves you right. I forget what ";" does. Doesn't matter though. Once your fingers learn how to do it, you don't have to remember anymore.