First choose a state by typing its abbreviation. A grid will then be placed over the state, larger states will generally have larger grid squares. Then, name any city from your chosen state in each grid square which fits the category label for each square.
LETTER: means the city starts with that letter.
NUMBER RANGE: (such as 2-5, 10+) means the city contains that many letters (excluding spaces and special characters).
POPULATION RANGE: (such as 50-100K) means the city has that range for its population.
2+ WORDS means the city name has 2 or more words (words denoted by a space or hyphen).
At the end of the quiz the largest population missed answer will show in each square.
A quick suggestion to quiz takers – on my computer, the relationship between where my cursor is pointed and where Google Maps thinks the cursor is pointed is not perfect, particularly when the red dropped pins overlap. You might have better luck if you zoom in one or two levels when clicking on capitals that are close by each other (particularly in the Northeastern states).
No shade to hugequiz on this – they are doing a great job with the tools available.