First choose a difficulty by typing ‘beg’, ‘int’, ‘adv, or ‘exp’ – Beginner is 200km radius, Intermediate 100km, Advanced 50km, and Expert 25km. Then, enter 1K+ population cities and all 1K+ population cities within that radius will automatically fill in.
hugequiz Premium members will see the 50 largest missed cities at the end of the quiz as large, purple markers.
NEW: Premium members can now also play a 3-hour time limit 'custom' coverage quiz of any distance from 5km to 500km, simply enter the distance followed by a '.' instead of choosing from one of the four levels, i.e. '350.' Quiz score is not recorded for the custom coverage option.
NOTE: the source citypopulation.de does not have a some Belarus/Russia/Ukraine smaller places such as villages so that data isn't available.
Quiz Takers 
i changed this to remove Frankfurt – it will be under its full name in a quiz for 15 letters.
Newcastle? also please accept Genichesk
This series of quizzes uses the full official name for cities, so it’s Newcastle upon Tyne. Same for Stoke and Hull for instance.
yeah i tend to use full city names for counting letters…will add that alternative.
then why do you use Frankfurt and not Frankfurt am Main
If you have Newcastle as an alternative won’t the city appear in two quizzes, this one and the one with more letters? I’ve seen quizzes with Frankfurt and Frankfurt am Main but with such an amount of quizzes one can excuse a bit of inconsistency here and there.