Thank you for your feedback, the engagement is the biggest problem in this game, A lot of people just click a few flags and leave from the match. I will probably add a beginner mode or a flagdatabase where people can view all flags name while scrolling down.
I'm also planning to add more topic to the game. Country Quiz 2 is a kind of game engine, the images are easily replacable, and the answer is the source image's name, so its not hard to add more topic to the game. for example: currecies, etc...