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I have bought World of Warcraft Battle Chest where I got World of Warcraft and Burning Crosade Expansion (and CD key for bouth of them), and do I still need to pay to play game or I can play it for free in some other servers or something like that (I heard that I can), ok...that's my question is there any way to play World of Warcraft or Burning Crosade for free, please answer