Even if it's your own list, you probably should work based on other people's opinion too. That way, you wouldn't miss some of the most obvious of our days (San Francisco, Seattle, Shanghai, Bangalore) and you would think twice about some of your very strange choices (Dallas, Houston, Bordeaux, Nagoya, Lagos to name a few).
I'm working on a big, and improved list of cities. The organization of the quiz is a little messed up, so I may release other versions of this quiz in segments.