(adsbygoogle = window.adsbygoogle || []).push({});When buying or selling the Classic World at War maps for Black ops, MAKE SURE the two parties involved in the transaction have the same version of the game. Trade with people in your own country, as different countries have different versions of the game and gamesharing the maps arent compatible with different versions. For example, I have the Canadian version of the game and my friend from austrailia shared the maps with me, they downloaded and installed but do NOT work in game. So before you pay some random kid 15-25 bucks for the maps, be sure of this.