When buying PC games made by the Company Valve be extremely careful as with many of these games for example: The Orange Box, Half Life 2, Left 4 Dead 2 you will need to have a Steam Account and be connected to the internet to install them and if the game you are buying is pre-owned when you go to put in the serial key it will come up with a mesage saying something like "Duplicate Key, this key has already been registered to another Steam Account". So this will leave you with a game that you will not be able to play and possibly unable to install. You will not be able to get Steam to transfer the serial key over to you either as you have brought it second hand from an auction site. I know this from experience having brought The Orange Box from a charity shop and tried to register it.
Buying PC Games by Valve
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28 January 2011
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