If you look on the back of your Sims 3 user manual, the code will be on the very top.
no
It is a code needed in order to play the game.
you use the code that is on the manuel, the same one you used to install the game.
no.
There should be a code on the back of your instruction manual at the bottom.
There is no code
It's different on every box.
The only place Serial key is stored is inside the booklet. Therefore, you yourself can't possibly find the serial code. You can try to contact EA and let them know of your situation and ask them to provide you with an alternative serial code.
If you are asking about the serial number of the legal version of the game Sims3 then look on the back of the package it come in near the company logo of the company that developed the program
Unfortunately, there isn't one.
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buy the game you will find it