All the games are well sorted and available with a picture of its cover along with its download link. All the games are either in PSP ISO or CSO format. Sometimes you might require to use winzip or winrar to extract the downloadable Games .
You might need to modify or downgrade your PSP to run these Games. A Custom firmware would enable you to run all the free games available on the sites. Once you have that done, the next step is merely copying the PSP ISO games file from the PC to your console .
