The world of the Three Question Marks - The exciting quiz about the cult detectives

Do you know what Bob's mother's first name is? In which episode Justus breaks a taboo? And how many secret entrances the headquarters has? The once US-American youth book series "The Three ???" has become an absolute cult in our country and now includes well over 200 exciting criminal cases. It's not easy to keep track of them all! Get ready for this special quiz, compete against your friends in different game variants and find out which of you is the greatest "The Three ???" expert.