Click START to begin - then fill in the 100 squares with World countries (see NAMING NOTE below) based on the categories in the rows and cells. For example, if you are looking at a cell with 'Asia' in its row, and 'Starts With A' in the column, that cell can be filled in with 'Armenia.' Many shortened names of countries are accepted, such as DRC, CAR, UAE, UK, US, etc. Answering a country which doesn't fit in any remaining unanswered cell will end the quiz.
Occasionally a cell may not have a qualifying answer, in which case it will appear blank and be a gimme. After completing the quiz you can simply click RESTART to play again.
Please note that 'star on flag' does not include a representation of the Sun.
Scoring is based on 100 points for each correct (or blank) square, and 5 points are subtracted for every second used on the quiz. So you are rewarded for getting squares quickly, however be careful as not to name a country which doesn't qualify for an open cell.
NAMING NOTE: You must type a '.' (period) after a country name or abbreviation to submit it, to prevent entering a country you don't want to (i.e. Guinea when you want to enter Guinea Bissau). For country naming purposes, the following names are used: Cote d'Ivoire, Timor-Leste.
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Quiz Takers 
Is there any reason I’m not aware of why Tromsø isn’t included? Current population looks to be over 50k but that might be a similar situation to Muscat I don’t know of.
You might be looking at the full municipality – city proper is a little too low:
https://citypopulation.de/en/norway/cities/ua/?cityid=8252
Saigon (Ho Chi Minh) should be accepted under both names as they’re equally used and thus should be on both the 6 and 9 letter quizzes.
Also, since Mumbai/Bombay is a 6 letter city no matter which of those two names you use, both should be accepted.
On most quizzes Saigon is accepted as an alternative for Ho Chi Minh City but for this letter-based series it must be one or the other as no city should appear on more than one quiz. As the official name for the city is Ho Chi Minh City that name should prevail over Saigon which, as useful as it is as an alternative name, it’s an outdated designation.