Flags of All World Countries
Andrey Solovyev
WELT News
WeltN24
Flags & Capitals of the World
Smart Fox: learning quiz games
Flag Quiz - Flags of the world
eleFUNt Games
Flags
gedev
Flags Quiz - Guess The Flag
PrizePool Studios
Flags of World Countries Quiz
Gryffindor apps
Flags of the World + Emblems:
Beeks — Quizzes, Games, Tests
World atlas & world map MxGeo
HPB Labs
Geo Flags Academy
MythicOwl