Whoops! I apparently didn’t read the title well enough. I saw largest islands and couldn’t comprehend why Greenland, Borneo, Baffin, etc wouldn’t work. Only noticed once it was too late.
All my information came from the website which i linked in the description of the quiz but from googling it Malaysia is considered both a mainland and island country.
Australia is considered by many to be an 'island continent', or solely a continent because islands and continents are considered to be separate things, so Australia not included in this quiz.