Population density
Inside the question engineOpen the field notes
Country pairs are matched by population density: population divided by land area. Each stage makes the gap more subtle.
About the quiz: Population density
This quiz tests whether you know where people live most densely. Population density is the number of people per square kilometer of land area, so small city states can outrank huge countries.
How are the questions built?
Each round has 10 questions. Pairs are drawn from 196 countries and territories that have verified data and an outline on the map. The density gap between the answers shrinks at each stage: from 50% to 150% in the first questions to only 2% to 8% in the last ones.
Where does the data come from?
We calculate density as World Bank population divided by World Bank land area (FAO data).
A fact from the data
The most densely populated area in the data is Monaco (18,397.8 people/km²), and the most sparsely populated is Greenland (0.1 people/km²).