You begin with two Europe countries/US states shown in the grid. Upon starting, your job is to sort the countries/states in order from largest to smallest by max elevation (so countries/states with the highest max elevation first). The order is represented by the '1st' thru '16th' in each box. You can click on a country/state to move it to a higher position in the list - simply click once and it will turn red, then clicked another higher-ranked country/state to position the first country/state before it. Click submit to check your answers...if they are in order you will get a new country/state added to the end which needs to be positioned correctly, and so on until you either get one wrong or complete all 15 levels.
PLEASE NOTE: Only the portions of each country geographically in Europe are counted to determine the highest points. So no Asian portion of Turkey/Russia, African portion of Spain/Portugal, Greenland, etc.
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Quiz Takers 
the locations of the cities are very of, never in the center of the cities just vaguely in the right area.
Yeah the city centroids are based on the border of the whole city I believe.
These seem to be based on urban areas and some of the pins (Thisted for example) are way out in the countryside.
I think it’s just poor cordinates, A lot of the cities have pins right on a square border. Thisted is perfectly at 57N, Herning is perfectly at 9E. Hjørring and Brønderslev are perfectly at 10E, Helsingør is perfectly at 12º30’E, Vejle is perfectly at 9º30’E. etc.etc.
It’s centers of the boundaries I think based on the source (citypopulation), so yeah some aren’t going to appear right in the actual center of the populated area.
The pins on citypop are all accurate. I think you might be getting the municipal seat cordinates from the municipalities instead of the actual city. It would explain why larger cities like Frederikshavn and Helsingør are so far off while smaller cities and settlements in the municipality are more accurate. It’s actually quite bad, for example (on expert) it has Helsingør being in the square west of Hellebæk when it should be in the square east of it.
Interestingly the pins are accurate on the Denmark largest cities quiz.