Over 600 cars {with some dating back to the 1800's}, over 50 tracks, all new B-spec mode where the computer races with your cars, a new thing called photo-mode where you can take photos of your cars using fx and lighting etc, New physics system, better graphics, garages can now hold around 1000 cars, and plenty more subtle updates.....If you have even the slightest interest in racing games, GT4 will satisfy!!!!