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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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Type 'easy' or 'hard' to begin the quiz. Easy is a 15-degree grid, hard is a 10-degree grid. Then, name any 50K+ World city in each grid square which fits the category label for each square. Grid will be randomly placed each time the quiz is played.

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 250-500K) 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 square.

World City Random 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. The grid will be placed randomly each time. 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.

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.

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Bryson

2 months ago

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

KorZen

2 months ago

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

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darin

2 months ago

Reply to KorZen

Thanks, appreciate it!

mlnbld

2 months 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

2 months ago

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

Bryson

2 months 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 🙂