Type 'easy' or 'hard' to begin the quiz. Easy is a 5-degree grid, hard is a 2.5-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.
AK and HI are NOT included in this quiz as they often have grid squares with only one answer for this quiz.
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 
Should not Boise City be on here?
The one in Idaho I mean.
I don’t think there currently is a city named “Boise City” – there’s just “Boise” Idaho.
I’m not positive what the official name is, but my understanding is it is officially Boise City, Idaho. The city itself interchangeably refers to itself as the City of Boise (which would not count) and Boise City. The city code is specifically called the “City Code of Boise City.” The mayor’s Covid-19 public health orders have all been issued by the “Mayor of the city of Boise City.” The census designates it as Boise City, but that may be to distinguish it from Boise County.
I refer to it as Boise in all my quizzes. Even the city’s official website just says Boise so I will leave it as that.
Oklahoma’s seems to use the word City:
https://en.wikipedia.org/wiki/Boise_City,_Oklahoma
I so badly wanted “New Jack” to be a bonus answer.
No New York?
the city’s name is ‘New York’ – city is only added to distinguish it from the state…officially it is ‘City of New York’