The object of this quiz is to click on the circle containing the largest population within Europe. When you begin you'll be shown 2 circles with radii between 50 and 250 km on the map which do not intersect. Click on the one with the larger Europe population within it (based Europe population density info) then 'Submit' - if you are correct you'll move on. One incorrect round and the quiz is over. Every 5 rounds the number of circles on the map will increase by 1. Try to build the longest streak of correct circles. Circles displayed will always be non-intersecting.
PLEASE NOTE: ALL of Turkey is included in counting population (not just European portion), and the portion of Russia west of 61.5 degrees E (just east of Chelyabinsk). Nothing outside Europe (such as Africa or middle east other than Turkey) is included toward the population count within a circle.
Quiz Takers 
I ended up cheating for 2 missing cities in Russia… so that I could finally finish this quiz! I can now try finishing it with less circles
Why did Porto, Spain not work?
You mean Portugal? It’s just under 250k.
wikipedia says otherwise, and we all know that wikipedia is never wrong /j
In this case Wikipedia is actually more up to date.
If the quiz was about agglomerations, Porto would have over a million.
Why can i not give up whenever I want? It should be able to like on any other quiz, instead i have to wait until the timer is over.
it’s because you have to actually finish this quiz for a score to mean anything. finishing without covering all cities will give you a meaningless score because the object is to get the least number of circles.