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 
Any issues with pics/cities, let me know.
A lot of them seem really odd size, like only taking up a tiny portion of the picture box. Makes it hard to see. For instance, Vienna, Kharkiv, Rotterdam, London, Dnipro, Birmingham (almost normal width but bottom seems to be cut off).
Those cities were fine for me, but I had that cutting-off-issue with other images. Also some images were very small. It looked like an internet issue, but it’s weird that it only happens with some pictures.
It seems like you only get to see what the previous city was if you actively skip it, if the 30s timer runs out the “Last City” field is unchanged