If you've purchased the game on CD-ROM then you can find the serial code on the back of the instruction manual.
If you have downloaded it on the internet you have to use somebody else's serial code by browsing and searching for one on the web.
If you have downloaded it on steam then contact them because this shouldn't happen.
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Its on the top of the back of the booklet in the case the CD came in
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.
A serial code for a dsi is on the back of the dsi under the barcode, only you start with tw not whatever is on there like this:TW582054296 Not a real code
It is a code needed in order to play the game.