For each country, click on all major cities within that country.
Each of the cities listed are, for the most part, in the top 10 most populous cities within that country and/or the most capitals/major cities in their region. For example, if there’s a small town called Berlin with a population of 800 in the midwestern United States, I’m obviously not talking about that one.
Start by naming any country that France borders. Then name any country that borders any of those countries. Then keep going until there are no more countries left to name.
Otherwise, great quiz!