I didn't have that question, but I recommend to put Marseille without s as the main answer. Marseilles is an alternate (and arguably erroneous) spelling in English only.
Please change the clue for the French national anthem, as it was never composed in Marseille ! it was composed in Strasbourg in 1792 and originally known as the Battle Hymn of the Army of the Rhine; it became the national Anthem called the Marseillaise only in 1795
Cologne is not part of the Rhine-Ruhr area, as it's too far south. The most populous city of Rhine-Ruhr would be Dortmund. Cologne is the most populous city of North Rhine-Westphalia though.
There are cities further north in Colombia than Barranquilla. Manaure if it's mainland Colombia and Providencia y Santa Catalina Islas if you include outlying islands
I was surprised to get two questions about the Spanish-American war. I'm guessing they're the only two in the 180-questions pool of the quiz. Not my lucky day... (Yes, I missed both.)
It’s probably just me but this quiz doesn’t work at all on my phone (Safari). It only allows me to answer the first question and accepts no answers after that, and only 10 questions show up and the rest are blank.
I'm making a similar quiz with the exact same name with 500 possible answers but I have given 2-3 clues like landmarks or something famous for it.
Can I still make it since it's pretty big and I have already gave it a lot of effort