Second Most Populous City Given First Place #3

20 random countries have been removed from the map of the world! Can you identify them in 3 minutes?

Difficulty level: impossible and mean-spirited. Can you guess these countries based on a partial view of their flag?

In each randomized group, name any answer which matches the first category to reveal the second category, etc...

Drag the pin onto the correct country. Careful, though! Three wrong moves and the game ends.