Gran Turismo 5: Prologue is an odd one. It's not a "full" GT game, nor a demo. As a retail product, it sits somewhere in between -- and that certainly makes it difficult to judge. As the first PS3-powered entry in the popular Polyphony-developed racing series, Prologue marks the beginning of a new generation. Nice as it would be to think of this Gran Turismo 5 precursor as Polyphony's early gift to series fans, the very real $40 price tag overrides that thought. Basically, it's a bone to tide us over until the real game comes out.