I mean if you want an example of a series that translated a computer game into a serial format well, look no further than the Pokemon anime. It wasn't the best quality thing in the world, but I think it translated an RPG game into a serial relatively well. I think, as Mercen-X said, you'd have to cut far too much out of a film that it'd be almost unrecognisable or would just serve to disappoint (I'm sure, for example, most Harry Potter fans can point to bits from the books that were changed/removed that irked them).