Type 'easy' or 'hard' to begin the quiz. Easy is a 10-degree grid, hard is a 5-degree grid. Then, try to name the largest South American cities (min 50K population) 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.
At the end of the quiz the largest remaining city you haven't named will be shown in each square.
Quiz Takers 
I think some cities should count agglo too? Example is Vitoria being smaller than Serra… I’m a bit confused with this one!
It uses the populations of ‘Major Cities’ under each Brazilian state here:
https://citypopulation.de/en/brazil/
The municipality of Vitória really is less populated than Serra. In fact, it is only the 4th largest city in its state despite being the capital!
This quiz has the same issue that the Brazil city grid quizzes had – some urban districts are counted as cities (e.g. Coxipo da Ponte for the major city of Cuiaba)
I’ve figured out the problem from the source: https://citypopulation.de/en/brazil/matogrosso/
There’s two separate dropdown lists on this website. First is a section of “municipalities” and second is a section of “municipal districts”. Municipalities should be used for the BR quizzes and municipal districts should be excluded. If that works you could also redo the Brazil city grid quizzes without the 20k population limit? Thanks for looking into this
yeah i’ll switch this one to major cities.
The “municipalities” section on the page I linked actually contains all municipalities including those below 20k, I think that might be a better source for Brazil than the “major cities” dataset on the site
I want to stick to the cities on the site as they calculate the populations a little differently than they do the corresponding municipalities.