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World Country Population Guessing Challenge
DirectionsUpon clicking START you’ll be shown a country and a population slider below it. Move the slider to the country’s population and click SUBMIT. You’ll get a score from 0 to 100 based on how accurate your guess was. Complete 20 random countries to end the quiz.
If you click on the slider you can use the left and right arrows to move it more accurately.
Quiz Takers 
Great idea. Do you plan to do it with cities as well?
There are some city based ones just made and more coming.
This is a really fun idea. However the scale of the slider changes from country to country which effectively tips off the answer. The correct number seems to consistently be in the center-left portion (2nd quartile) of the scale.
There aren’t great solutions but using a single logarithmic scale might help.
I’ve switched it to logarithmic. Got it so it should work well now.
Thanks! Oh yeah, much harder… in a good way. Now I can’t cheat. 🙂