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.
Basically you can edit one line of type-ins like (territory|territory|territory) with each territory having its own individual type-ins within this format.
Then you can make each number and hint be hidden (in manual mode) until the previous clue is guessed
edit: 19/20, missed the final blue question. That territory is hard! Great quiz, nominated and placed in my favorite quizzes.
Then you can make each number and hint be hidden (in manual mode) until the previous clue is guessed