Europe, Largest Cities - Game Information

I need to improve my knowledge in the East!

OK, I moved the dot, thank you.

Please, Rostov (Pосто́в-на-Дону́) is in Russia, not in Ukraine

A small correction, The Dusseldorf urban are has more than 1 000 000 inhabitants.

The Ruhr-area consists of many cities.
I made a game about it a while ago:
http://www.purposegames.com/game/cities-in-the-ruhr-area-germany-quiz/info
I used the urban, or metropolitan, area population to qualify the other cities for this game so they are all areas, if not by name.
None of the cities in Ruhr have more than 1 000 000 inhabitants but the population of the greater Ruhr area is something like 5-12 000 000 (depending on definition) so it wouldn't feel right not to include it in this game.

Nice game !! this thing about the Ruhr, I don't get it, it's an area not a city, seems peculiar to that place, it comes up many times !! Not a problem for playing the game though.

Thank you.
I'm happy to include it since it makes the game better :)

In this list for example they include Düsseldorf:

http://en.wikipedia.org/wiki/List_of_urban_areas_by_population

It's true that there are different interpretations of the term "Ruhr area".

I see what you mean. In the statistical data I used they differed between Ruhr and Düsseldorf. But I will do as you suggest, will make the game better.