it is hard at the end if you have one party of good characters in kefkas tower and 3 partys of characters that can hardly win one normal battle.(trust me.thats the reason i havent completed the game yet and also my disk snapped."cries"i only just found out when i wanted to retry the game which was anoying.)so dont just use one party once you get to the world of ruin and once you are there and have assembled all of your characters level up as even as possible and use your best characters for the final battle.