English Counties with the highest population density

Can you name the 26 nations that have at least one urban area with 10,000,000 or more inhabitants? The '#' column is the number of megacities.

Name all the countries that have a population of at least 50 million people.

Name the countries that added the most people in each decade since the 1950s.

Can you select the 20 most densely-populated countries in the world? Three mistakes ends the quiz.