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 
Was muss man denn eingeben, damit die Stadt Offenbach grün wird? “Offenbach” jedenfalls nicht. Da wird nur der Kreis grün.
Sie müssen “Offenbach am Main” schreiben.
I had 259, but the score was not saved. 🙁
I like the quiz (but I’m also from Germany, so it’s not so hard for me), but I’m not so happy with the update.
1) in the previous version the german ä,ö and ü worked alongside a, o and u, now they don’t anymore.
2) the abbreviations are kind of odd. For example I didn’t get ‘Neumarkt i.d. OPf.’ because I couldn’t guess what kind of abbreviation you used. The correct name would be: ‘Neumarkt in der Oberpfalz’, but that does not work. ‘Neumarkt i.d. Oberpfalz’ also didn’t work. And there are several other examples where either the abbreviation worked, but not the whole title, or the other way around, and no abbreviation would work. That could definitly work better.
3) You don’t need the exact name of the district any more, which you needed in former versions. I’m not so happy with this, because if you type in ‘rhein’, you will get six or seven districts, which all starts with ‘rhein’. That should not really be the case. Also the difference between a district and a ‘free city’, which have often slightly different names, get lost.
4) if the word ‘kreis’ (german for district) is part of the name without a space between, you have to type it, but not if its an extra word (saalekreis <-> rhein sieg kreis), which is not so konvenient. That was also the case in former versions, but not typing the word ‘kreis’ if its at the end would definitly be more konvenient.
I’m using a new dataset now and the names have changed in it, ill try to fix the names so they are closer to the old way.
Rer ich weis gar nix