I don't think it would be any kind of Format issue ishandinho. Especially as you have a slimline PS2 (the newer version). I'm really confused about this one, you say that your PS2 and two of your friends PS2's have problems playing Fifa 08? If the Fifa 08's you are trying work fine in other PS2's (the PS2 engineers one?) then there must be a problem with all 3 of your PS2's or all '20 disks' must have some kind of fault with them....? My original belief would have been that you have a faulty Fifa 08.... Are all of these '20' Fifa 08's actual retail copies?