i got gta4 the minute it came out and didnt take it out of my 360. then one day i couldnt play missions anymore do to damaged disc. i returned the game and got a replacement. had the replacement for about 24hrs and now i am getting that i cant play online with it due to disc damage. my 360 is horizontal. i put all of my other games in and dont have any problems with them just with gta4.