Fill the World Map by Half-Size Area Chain of Countries
Starting from the largest country and then the next country closest to half the size of the previous one. When you've reached the smallest country, start again with the remaining countries
You are shown the initial letter of the countries that start each chain going down - you are shown the other initials when you guess the answer above it
I did it after turning off the timer. It took a very very long time. There are a couple of errors that make it very challenging. North Macedonia is listed as an M country, Eswatini is still listed as Swaziland and some standard JetPunk shortcuts aren't accepted (Antigua and Barbuda) require full name.