Awesome quizes, I have thoroughly enjoyed doing them. Slovenia has already come up, and can I also encourage you to continue, there are a number of countries that I haven't seen (DRC, Namibia, Mozambique, Zimbabwe, Zambia, Tanzania, UK, just to name a few). I look forward.
Fun fact; Afghanistan is the country that has changed it flag more frequently throughout its history. In this particular quiz, it was ironic to see two flags l confuse quite often, namely Mauritius and Seychelles.
This beats or equals 60% of test takers"
Geo-nerds skewing the statistics.
Btw, wonderful series!