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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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Other Quizzes You May Like:

World Grid Population Challenge

First choose a grid size by typing '30', '20', or '10'. A grid of that size lat/long will be placed on the map (so if you choose '20' the grid width and height will be 20 degrees). Then, double click on the grid square with the highest population within it (based on world 10km x 10km population density estimates). The highest-population remaining square will give you 100 points, all the way down to 0 for the one with the smallest population. Try to obtain the most points by successively double-clicking on the highest-populated grid square.

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World Circle Radius Population Challenge

The object of this quiz is to adjust each circle's radius so it contains the target population shown at the right. When you click Start you will be shown a marker on a random populated world grid square (there are over 800K 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 500 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 2.5 and 250 million people. Then click submit. You are scored on how close your circle's population is to the target.

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World Flags Color Selection Challenge

The object of this quiz is to fill in each blank flag with the correct colors for that country. When you click START you will be shown a country and 12 colors on the right, these include the flag's color and random colors not in that flag. Click on colors that represent at least 5% of that country's flag. If you click a correct flag color it will fill in on the flag and that color box will get a green border. An incorrect color will show with a red border. Complete all the colors in the flag to move on to the next country. Completing 10 countries will end the quiz.

You get points for correct answers and minus points for incorrect answers. Correct answer points vary based on the number of flag colors, flags with more colors can have a higher possible point total.

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Bryson

2 days ago

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

KorZen

3 days ago

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

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darin

2 days ago

Reply to KorZen

Thanks, appreciate it!

mlnbld

14 days 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

14 days ago

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

Bryson

2 days ago

Reply to mlnbld

Unlucky, but at least you kinda got it early on

waive

18 days ago

Whew

Klinkhamer

19 days ago

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