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 
Why is Seoul(almost 10M) only 539km? Cities over 10M(Tianjin or Shanghai) will be at least 800km away.
oops – i had miles instead of km – fixed now.
Where is Johannesburg? Or what is it called?
it’s actually Soweto. the city proper population is a little higher than Johannesburg
I really like that you can see some that you missed at the end!! Wish the city coverage quiz had that too.
I’m sorry, I’m slowly getting used to the quirks of this website. But Nasinu over Suva? Really?
Nasinu is now actually a larger municipality than Suva. Suva’s metro area may be larger, but my city quizzes use city populations.