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US City Latitude Grid Challenge
DirectionsChoose a number of cities by typing ‘3’, ‘5’, or ’10’. Then, enter the largest number of US cities you chose in each 2-degree latitude range. Only green ranges contain answers. When you have 2 left to go in a range it will fill in faintly yellow, 1 left it will be orangish, and all done it turns red. A time bonus is given for completing a square (it is greater for higher levels).
hugequiz Premium members will see the top 25 missed cities at the end of the quiz as purple markers.
Quiz Takers 
I love these quizzes. My only suggestion would be to offer them in formats limited to the contiguous United States. Alaska and Hawaii have so many obscure localities; I think it would be helpful to have some that are limited to the “lower 48.”