"Game designers like to think that games are different than stories. Although games and stories can contain similar elements, there are some things that games can do but stories can't. This viewpoint is known as Ludology (from the Latin for game, ludus).
In the past, though, creators of other new media — theatre, film, television — have also thought this, only to be proven wrong. So are game designers wrong? Or is there something about games that is fundamentally unobtainable from stories?"
— Richard A. Bartle, MMOs From the Inside Out (info)