An interesting idea for a quiz: thank you. Two suggestions though:
(i) I know it's not meant to be an exhaustive list, but there are a few more you can add - Fiji; Penang state in Malaysia; the county of Berkshire in England
(ii) As quite a few of the answers are quite obscure, perhaps it may be worth adding clues e.g. "Iberian city" for Madrid, "Pacific island" for Norfolk Island etc?
No, all media specifies Norfolk Island as 'Norfolk Island' and never just Norfolk to prevent confusion with the English county of Norfolk. I would like to keep this in the quiz because the flag of Norfolk does not have a tree on it.
The flag appears on other quizzes that accept "Norfolk". If you type in "norfolk" it is obvious that you mean "Norfolk Islands" and not that county that I just find out it has a flag.
(i) I know it's not meant to be an exhaustive list, but there are a few more you can add - Fiji; Penang state in Malaysia; the county of Berkshire in England
(ii) As quite a few of the answers are quite obscure, perhaps it may be worth adding clues e.g. "Iberian city" for Madrid, "Pacific island" for Norfolk Island etc?