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 SECOND LARGEST city in each grid 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 2nd largest city accepted in that square (100 being you named the 2nd largest city). If you guess the largest city it will be based on the ratio of the 2nd largest city's population to the largest.
At the end of the quiz the 2nd largest city will show in each unanswered square, and for those answered the 2nd largest city will be listed next to your score if you didn't answer it.
Quiz Takers 
How do you figure #54? The strait of [name of country across the strait from it] is far more than 25 km, even counting outlying islands.
Kinmen County.
Copenhagen is within 25km of a land border?
the countries don’t have to have a land border, I mean the distance is to the closest point on land. ill rephrase the directions.
From what point of an urban area do you measure? Isn’t bujumbura supposed to be on here too?
not big enough city proper population. measuring from city proper limits not urban area limits.
ah, thanks!