Depends. It could very well cost you nothing if it's simple enough, but if it's a full-fledged game that's going to be sold on the commercial market as a popular item, it can cost thousands and thousands of dollars.
You could make it for free. But you'll have to pay time. Adventure Maker makes making games easy. http://www.adventuremaker.com/ . I'd stick with the free trial until you really get into it.
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