The object of this quiz is to adjust each circle's radius so it contains the target population shown at the right but ONLY within Europe. When you click Start you will be shown a marker on a random populated Europe grid square (there are over 90K 10x10 km grid squares used for the data, courtesy of https://human-settlement.emergency.copernicus.eu/index.php). Also you will see an adjustable circle of radius 100 km to start. Adjust the circle's radius by dragging it until it contains the target number of people shown - this target will be between 5 and 100 million people. Then click submit. You are scored on how close your circle's population is to the target.
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 
btw why is Figueira da Foz not an answer on the F quiz? it seems to be bigger than the answer currently listed
http://citypopulation.de/en/portugal/coimbra/figueira_da_foz/015764__figueira_da_foz/
Portugal I use localities – other figures are using larger areas than just the city proper.
Damn, this is so hard lol
It would be nice to have a little bit more time for this, 10 minutes is challenging… Other than that – I really love this quiz!
ill bump it to 15
still not enough though… it’s less than 10 s per square :/
yes but there’s a bonus for completing a square.
there were no bonuses for me tho
oh you’re right not on this one – i’ll up starting time.