Guess the modern-day countries that were once in the Dutch Empire, in whole or in part. Most the the colonies was owned by either Dutch East or West Company.
I'm pretty sure Germany needs to be added. Of course I don't know exactly until when this quiz goes back, but the current Dutch-German border around the Ems delta wasn't always as it is now, and several towns currently in Germany used to be part of the Dutch Republic until the early 17th century.