Every GT was easy imo. GT4 was my favorite because all the cars, the introduction of rear wings, the photomode, the huge track list, the background music and sound effects (which are still my favorite). I did miss the different types of 'fake' f1 cars from gt3 and some things like the random car rewards. I remember doing the save game trick on the memory card to get the Denso SARD Supra GT500But overall, GT4 just edged out GT3. GT5 and 6 weren't bad games imo, just not as good for their time as the previous two.