The object of this quiz is to click on the circle containing the largest population within Europe. When you begin you'll be shown 2 circles with radii between 50 and 250 km on the map which do not intersect. Click on the one with the larger Europe population within it (based Europe 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.
PLEASE NOTE: ALL of Turkey is included in counting population (not just European portion), and the portion of Russia west of 61.5 degrees E (just east of Chelyabinsk). Nothing outside Europe (such as Africa or middle east other than Turkey) is included toward the population count within a circle.
Quiz Takers 
Perhaps a list of the stations you’ve guessed somewhat like with the periodic table.
Possibly with a per letter scorecard
1st try 77 done
A National Rail stations quiz for all train stations in the UK would be neat.
More time. There’s no way you can get it all done in that time (yes, I see two people have done so, but I am very dubious). Also, it didn’t pop up afterwards with the top 50 most difficult ones. Was this intentional?
there’s 30 minutes now and there are bonuses along the way…so I bumped it up a bit.
Should have more time, I could have done way more with more time. Otherwise good 🙂
a ton of UK (especially London) new users here – so this is for you! let me know if i need to accept any alternates.
Mr. Holmes, first name Sherlock, would like you to know the street he lives on is the name of a Tubeway Station.
Very good quiz, thank you. Echoing gmaric.22, could have done with some more time. You’re asking for two seconds per guess which isn’t possible for us mere mortals.
ill bump it up a little soon