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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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Quiz Takers

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World City Grid Blackout Largest City Challenge

Type 'easy' or 'hard' to begin the quiz. Easy is a 15-degree grid, hard is a 10-degree grid. Then, try to name the LARGEST city in each grid square which fits the category label for each square. To name a city, you must first click on the grid square to make it have a GREEN border. Then, type in the city answer for that square followed by a '.' (a period). You are given a score from 0 to 100 based on your answer's population compared to the largest city accepted in that square (100 being you named the largest city).

LETTER: means the city starts with that letter.
NUMBER RANGE: (such as 2-5, 10+) means the city contains that many letters (excluding spaces and special characters).
POPULATION RANGE: (such as 50-100K) means the city has that range for its population.
2+ WORDS means the city name has 2 or more words (words denoted by a space or hyphen).

At the end of the quiz the largest population missed answer will show in each unanswered square, and for those answered the largest city will be listed if you didn't answer it.

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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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Bryson

22 days ago

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

KorZen

23 days ago

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

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darin

22 days 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

22 days ago

Reply to mlnbld

Unlucky, but at least you kinda got it early on

waive

1 month ago

Whew

Klinkhamer

1 month ago

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