You dont have to download anything, people who play naruto usually go to the site Zatch Bell CCG Chat Site to meet up and play games. There are a lot of zatch bell players there most of them are nice and most of them also play naruto, so go there and ask for games. Then If you have aim or any type of messenger handler you can get to meet new friends and play more people, more often, making buying naruto worth while. there is no real way to prevent cheating this is why i gave you that site most people there are very honest and play by the honor system. So I can speed up your procees by asking if you have aim or a messaging system at all.