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.
Darin, if you are going to make new quizzes only available for premium users for the first week they were published, you need to solve a problem. You know, navigation on this site is not the best. I always check the new and updated section – but it only includes a few quizzes. When this premium wall for this quiz is over, the quiz is already gone from that section. You should expand it or make it so we can sort quizzes by date of creation. I was away for two weeks and i probably missed some new quizzes because i am not able to search for them manually and guess if i played them or not. Because when i discovered this site, i played all geo quizzes.