Your comment about Eastern Europe confused me. How can there be a non-European part of Eastern Europe? Anyway, all the answers are European and I guessed them all despite the distraction (tried places like Baku in case that was what you were getting at.
Second issue: I didn't consider Frankfurt since I had already guessed Hamburg and every other quiz I've done on jetpunk has placed Hamburg ahead of Frankfurt in population. Where is your data coming from?
Reply to your first issue: I meant that the UN's version of Europe includes all of Russia, including Siberia, but geographically speaking, Siberia is part of Asia, while anything west of the Urals is Europe. I will remove that caveat anyway just in case other people get confused.
Reply to your second issue: My data is urban area population and comes straight from JetPunk on this well known featured quiz by Quizmaster. There, it says that Hamburg's urban population is 2.88 million while Frankfurt's is 3.28 million. I think you mistook the cities for City-proper, not urban-area.
This is grouped by UN regions and in that, all of Turkey is counted as Western Asia, which is a region of Asia so Istanbul would be counted in that, not European regions.
Second issue: I didn't consider Frankfurt since I had already guessed Hamburg and every other quiz I've done on jetpunk has placed Hamburg ahead of Frankfurt in population. Where is your data coming from?
Reply to your second issue: My data is urban area population and comes straight from JetPunk on this well known featured quiz by Quizmaster. There, it says that Hamburg's urban population is 2.88 million while Frankfurt's is 3.28 million. I think you mistook the cities for City-proper, not urban-area.