Very nice, both the idea and the flags appearing as you guess! Personally I think I'd also eliminate the ones with 'thin lines' (eg Tanzania) and those with 'covered triangles' (eg Saint Lucia) or covered line ('Sudan') and I'd put Congo after Poland (listed as Republic of the Congo). How about making one with just 'flags divided in equal/almost equal parts of different colours'?
yes I guess you're right in the sense that those flags are effectively 'without symbols', maybe what I said would apply more to a 'country flags with extremely simple shapes' or something
I think you should state in your quiz explanation that Palestine is also included because country-related quizzes in this site are usually based on "Country of the World" quiz which omits Palestine.
Yes I know, but I think the official flag of Costa Rica has its emblem on it. On the other hand, Peruvian official flag doesn't have its emblem while the alternative one has. Correct me if I'm wrong.