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World Circle Population Selection Challenge

Directions

The object of this quiz is to click on the circle containing the largest population. When you begin you’ll be shown 2 circles with radii between 100 and 2500 km on the map which do not intersect. Click on the one with the larger population within it (based world 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.

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World Circle Population Guess Challenge

You will be shown 10 different circles of radius 250-2000 km. Using the slider (or manually typing into the box below the slider), guess the population contained within each circle then click SUBMIT for each one. Populations are based on world population density at https://human-settlement.emergency.copernicus.eu/index.php.

World 20 Circle Population Challenge

The object of this quiz is to place 20 circles of radius 1000 km on the map so that they contain the largest total population.

When you begin you'll be given a 1000-km radius circle centered on the map. Move it using the mouse and click SUBMIT. You will be given a score for that circle corresponding to the total population contained within it based on world population density at https://human-settlement.emergency.copernicus.eu/index.php. Try to complete all 20 circles with the highest total score.

Any INTERSECTING areas are only counted one time, so no population will be counted more than once.

175

World 10 Circle Population Challenge

The object of this quiz is to place 10 circles of radius 1000 km on the map so that they contain the largest total population.

When you begin you'll be given a 1000-km radius circle centered on the map. Move it using the mouse and click SUBMIT. You will be given a score for that circle corresponding to the total population contained within it based on world population density at https://human-settlement.emergency.copernicus.eu/index.php. Try to complete all 10 circles with the highest total score.

Any INTERSECTING areas are only counted one time, so no population will be counted more than once.

807

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Bryson

1 month ago

I lost my streak of 63 because it was between 572 million and 571.3 million

KorZen

1 month ago

This is my absolute favorite quiz on this site. Darin, you outdid yourself with this one

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darin

1 month ago

Reply to KorZen

Thanks, appreciate it!

mlnbld

1 month ago

Seeing 7 or 8 different circles on the screen made me think it would be a fun challenge to try and order them largest to smallest: perhaps a suggestion for a separate quiz? Start with 3 circles, add one after each correct ordering, and see how many you can get?

mlnbld

1 month ago

Can anyone beat my record? Chose wrong between a 709,128,175 circle and a 709,498,818 one. 0.052%!

Bryson

1 month ago

Reply to mlnbld

Unlucky, but at least you kinda got it early on

waive

2 months ago

Whew

Klinkhamer

2 months ago

This quiz gets even more interesting if once in a while there is no circle in east Asia 🙂