However, the PSP is home to two incredible, full-fledged God of War titles that are widely considered some of the best games on the handheld. These are the ones you should be looking for:
The short answer is that because it was never released for the PlayStation Portable (PSP). PPSSPP only runs games designed for the PSP, whereas God of War 4 was built for much more powerful hardware like the PlayStation 4 and PC. god+of+war+4+ppsspp+iso+file+download+work