Good quiz, but the question "To have another country contained in its name" is really bad. There are 4 possible answers and only 1 is randomly correct (Guinea-Bissau, SoMALIa, Equatorial Guinea, South Sudan)
Could use more time, but great quiz! I also agree with GoblinOfCooz that the question about containing another country within its name should accept all four possible options.
Better still, it is ought to be a different question. If it accepted all four answers it would mess up the format, the point of being that the pool of possible answers are eliminated one at a time.
Just a suggestion, but couldn't you fix the "To have another country contained in its name" problem by changing that clue to "To have a name containing a hyphen"?
Ivory Coast doesn't really have two capitals. It has one capital and one primary city that dominates economically. Benin is closer to having two capitals: an official capital and a different city that is the seat of government
This is minor, but some questions were capitalized and some were not. "That border Tunisia" should say "That borders Tunisia". There is no prequel; the link is broken.
Also, Eswatini has some weird capitalization going on