In each group, name any answer which matches the first category to reveal the second category, then name any answer which applies to both categories to reveal a third, and so on.
Honestly I am shocked that I finished this. Doing the Flags of the World quiz a few days ago definitely helped.. and I warmed up by doing a few flags by continent quizzes that I was less familiar with
No five pointed star for blue categories.
No green for the green categories.
And no red for the orange and purple categories.