Super cool idea! Sadly execution isn't quite there. You can clearly read the cities' names and just guess them based off of their number. Some of the cities don't turn green as well when guessed, Karachi is never used as an answer, and the Francophone clue is both invisible and doesn't have an answer. This isn't as urgent but the font also looks a little weird, some letters are stretched weirdly compared to others (but that's just a cosmetic change). If you find out a way to clean up all of these small things, this will no doubt be a great quiz!
Thanks for all the inputs! I tried to fix most of the things you mentioned. Regarding font however, even I noticed some looked weird and stuff, but I couldn't seem to find what the problem was. Maybe it's bad luck, but I'll try again. Thanks anyways :)