Question for Command and Conquer: Generals Zero Hour

kodiak asks: Added Jun 25th 2011, ID #203997

Question for Command and Conquer: Generals Zero Hour

It says invaild serial number when I want to play online
How can I out the vail serial number? and get
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Glaceon answered: Added 16th Feb 2012, ID #483353
If you bought your game used you'll have to use a CD key that hasn't been used yet or else you won't beable to play online.

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