If it's intellectual or ridicoulous who cares?
The fact that somebody can come up with these questions and hide answers so cleverly really needs some praise. The fact that you can't get through a question doesn't mean to give up on it just read the questions really carefully and try searching every inch of a confusing question. Heck write down the previous answers somewhere so you don't get lost if you have to work your way back up to the higher questions. (I end up having to do that anyway.) I just wish i could think of creative questions like that but until that day comes keep making your quizzes confusing,brain teasing,and last but not least funny.