How do I play this quiz?

Test your knowledge with the US Random Grid Population Challenge Quiz! Choose a grid size, locate the square with the highest population, and earn points.

Do abbreviations or alternate spellings count?

Yes. Most quizzes allow common abbreviations, alternate spellings, and short forms. Try typing just the first few letters — if it matches, it will autofill.

North America

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US Random Grid Population Challenge

Directions

First choose a grid size by typing ’10’, ‘5’ or ‘2.5’. A randomly-placed grid of that size lat/long will be placed on the map (so if you choose ’10’ the grid width and height will be 10 degrees). Then, double click on the grid square with the highest population within it (based on US census tract information). 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.

Enter grid spacing to begin ('10', '5' or '2.5')...

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The object of this quiz is to click on the circle containing the largest population. When you begin you'll be shown 2 circles on the map with radii between 10 and 250 miles which do not intersect. Click on the one with the larger population within it (based on US census tract 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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darin

1 year ago

Issue with Aleutian islands grids not registering should be good now.

Philip

1 year ago

Reply to darin

Cool, thanks! Just curious, do you mind sharing what the issue was?

Author

darin

1 year ago

Reply to Philip

Was not calculating the grid square correctly when it crossed over 180 degrees line

Philip

1 year ago

Reply to darin

Ah, interesting. I had that intuition, but there was a Hawaii cell right below it that didn’t seem to have the problem. I wonder if it’s because the Hawaii cell didn’t have population west of 180?

Philip

1 year ago

This format has been such a terrific addition to the site! Probably my favorite quiz format now. Looking forward to seeing how it works for other geographies. Thanks for such a great site.