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 largest cities in each square IN ORDER. 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).
The squares will start with '0/5' (or maybe fewer cities if less exist in that square). Click on a square and enter the largest city in that square not yet answered (so, the largest city if you have yet to answer a city in that square). You will then have '1/5' and need to click on that square to name the 2nd largest city, and so on until you complete all the cities up to 5 (or less if less exist). If you name an incorrect city in a square it becomes 'locked' and turns red and you can no longer accumulate cities in that square.
You receive 1 point for the largest city in a square, 2 for the 2nd largest, and so on.
AK and HI are NOT included in this quiz.
At the end of the quiz the largest remaining city you haven't named will be shown in each square.
Quiz Takers 
a quiz with all urban areas in the us (regardless of population) would also be fun!
Per the census definitions, here are three metro/urban areas type quizzes:
https://hugequiz.com/quizzes/us-metropolitan-statistical-areas/
https://hugequiz.com/quizzes/us-micropolitan-statistical-areas/
https://hugequiz.com/quizzes/us-combined-statistical-areas/
It would be neat if we could select a specific amount of metro areas like you can with cities with the two hashtags. Like in the US Largest Cities, if you want 347 cities, you’d type #347#. I’d love it if we could do that here.
I had no idea that Concord (and basically the rest of Contra Costa County) was considered its own urban area. I always assumed we were part of the SF-Oakland UA.