I have just bought me a ps3 after my xbox 360 broke, and I had cod waw on the xbox 360 On the ps3 I have cod 4, and after playing it, I think I prefur cod waw, but I dont wanna go on an empty multiplayer game, are there any gamers that still go on world at war? Also, Would I be able to trade in cod4 for waw at a gameshop anywhere?