I learned all the flags of the world from this app.
This is an extremely good app, and it has thought me so much. However I do miss some islands and territories as their own entities. Would you please consider adding the following (in no particular order) to the flag quiz: Tristan da Cunha Ascension Island South Georgia and the South Sandwich Islands British Indian Ocean Territory Wales Scotland England Northern Ireland Åland Madeira Azores Canary Islands Melilla Ceuta Corsica Saba Sint Maarten Sint Eustatius Saint Barthélemy Tokelau Macau Zanzibar Transnistria Somaliland Kurdistan Tibet East Turkestan