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 
on int how is it not la paz or cochabamba i tried some stuff in peru and chile too
it’s el alto instead of la paz and santa cruz instead of cochabamba?
why doesn’t it accept santarem in beg. mod
Not the largest in its square
Mendoza?
It isn’t the largest city in that square, though it is pretty close.
Thats a dumb thing to not consider the whole conurbation major name. Really dumb. Same thing with San Juan.