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A. Each cell contains a country: they all have different inital letters. B. The arrows indicate alphabetical order for the corresponding row/column. C. For each of the 6 continents there is a column containing 4 of its countries; the only exception is Indonesia appearing in the Oceania column. D. Countries in the same column are connected either directly (ie they share a land border) or via other countries in the same column, with the exception of North America and Oceania columns. E. There are 4 countries that do not border any other country in the quiz.
In the last box, because of the alphabetical order, you need to have a country that begins with z. There are only two countries that satisfy this condition and they both are in Africa.
And still because of the alphabetical order, you need to put a country that begins with y in a box that is adjacent (vertically or horizontally) to the last one.
But in each column, you need to have a different continent.
So the only country that begins with y, which is an Asian country, needs to be in the box in the last row next to the box near the country that begins with z.
Column 2 and 3 couldn't be replaced by:
dominican republic - grenada - haiti - jamaica
france - luxembourg - monaco - netherlands ??
And still because of the alphabetical order, you need to put a country that begins with y in a box that is adjacent (vertically or horizontally) to the last one.
But in each column, you need to have a different continent.
So the only country that begins with y, which is an Asian country, needs to be in the box in the last row next to the box near the country that begins with z.