I am wondering why you should do that?

Most game code is customized code.. so if your code doesnt consist of tight modules its worthless. IMHO most game parts will be rewritten or completely redesign if someone buys your project. The most interesting part of it are the concept papers, the copyright and of course licensed ressources which will be inherited in that deal naturally. I would also add maybe contact information of any outsourced people which like to proceed in the development as well.

The most important part of the transaction is the copyright deal. Do you wanna sell it as franchise or a complete copyright transaction? Do you wanna sell it to several people and every sold unit makes one dollar for you or so?

Maybe you should talk with a lawyer.

BTW: What do you wanna sell?