If you write a sentence and add a question in parentheses, should there just be a ? in the parentheses at the end of the sentence or should there also be a period?

Hello to all grammar freaks, I'm currently very unsure about a grammatical problem. Suppose I write a sentence and add a question to the sentence, but it is in parentheses. Which punctuation mark comes at the end? Example: I'll probably be running a new role-playing system (although: didn't XYZ say he'd rather continue playing the…