Is it possible for one disc to get a bug that affects gameplay? That seems kind of odd. I could understand if a disc got scratched, but how could the code on the disc get changed for only one disc?
Been playing Animal Crossing: A New Leaf a lot. It's a neat game because there's only a certain amount of activites you can do in the day and then you run out of things to do until the next day. The game has a real day/night system where if it's 2pm in real life it's 2pm in the game, shops close at night, etc.
Very fun/addicting to pick up for an hour or two, complete the daily things and set things up for the next day.
I also ordered FF13 from Gamefly, going to try it once more see if I can get into it.