Type 'easy' or 'hard' to begin the quiz. Easy is a 5-degree grid, hard is a 2.5-degree grid. A random grid will be placed on the map. Then, try to name the THIRD LARGEST 10K+ European city in each grid square. 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). You are given a score from 0 to 100 based on your answer's population compared to the 3nd largest city accepted in that square (100 being you named the 3nd largest city). If you guess the largest city it will be based on the ratio of the 3nd largest city's population to the largest.
At the end of the quiz the 3nd largest city will show in each unanswered square, and for those answered the 3nd largest city will be listed next to your score if you didn't answer it.
Quiz Takers 
Can you make some of these for Africa, South America, and the Middle East? Also, how about coverage for cities starting with the same letter as their country? You could even break that into separate versions for each letter.
I would love to have this quiz for other continents as well! As far as I can see, there is only a World version and a Europe version. That should be relatively easy to make, right?
I have Ioannina, Ierapetra, and Ialysos in Greece, but for the life of me I either cannot find the fourth city, or cannot come up with the proper spelling. Is there a listed source somewhere?
Did you ever figure it out?
Imittos