Flag Solitaire + Quiz - Brain

(General Introduction) You have two ways to enjoy this game: playing the solitaire or answering the quiz. Yet they are not separated. You will answer better if you play more. (Number of Countries/Regions) There are totally 175 countries/regions in the game, classified into seven groups by population from high to low, with 25 countries/regions in each group. (Playing the Solitaire Game) Playing…