Inside your Sims3 CD case, there is suppose to be an booklit that has the same cover as the CD case. Look at the back of that at the bottom. If you don't have the booklit, go back to the store that sold it to you with your purchase-slip, and ask them for the booklit. If for some reason you have a booklit that's black and white on the outside, you might have an coppied CD/CD case/booklit/Game. If you have an booklit, but there is no number at the bottom-back, go ask the store you bought it at for help or look inside the case somewhere, it might be there...
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It is a code needed in order to play the game.
no.
A serial code in The Sims 3 is what you require to install the game which means no serial code is equal to no Sims 3 on your computer.
Yes, you must have a serial code to install the Sims 3.
There is no "the serial key" for World of Warcraft. You have to actually go out and buy the original game (and the expansions) and download it to your computer. When it prompts you for a serial code, enter it in. If you already have the game in front of you asking you to enter in a serial code, unless you borrowed it or pirated the game, you should have a 25-digit serial code on a piece of paper that came in the CD-ROM box that will look something like a bunch of random letters and numbers with a hyphen (-) every 5 characters. If you downloaded the game, you should have received the code from either the World of Warcraft website (www.worldofwarcraft.com) or in your email. If you did not receive a code with your download, contact Blizzard Entertainment via their website (www.blizzard.com).