Try to name the most populous cities in Europe that begin with the letter 'D'; using the English language spelling or the spelling most commonly used on English language quizzes on Jetpunk.
Population figures from citypopulation.de for urban agglomeration/metro area
Lost of things are missing, not just in this quiz, yet in the complete line of quizzes from this author. Douai-Lens, for instance? It's an agglomeration, not a city.
I have decided to include Darmstadt and Derby. Dusseldorf, Duisburg and Dortmund I have decided to leave out as they are part of larger agglomerations. When it comes to this question of whether to include certain cities when they are deemed part of larger agglomerations, I have no definitive answer. I make the best choice I can based on the source citypopulation.de.