Harry Potter anniversary quiz: 20 questions to test your knowledge

Today marks the 20th anniversary of Harry Potter and the Philosopher's Stone, the first book in J.K. Rowling's phenomenally successful series.
Take our Harry Potter quizTake our Harry Potter quiz
Take our Harry Potter quiz

If you consider yourself a Potterhead, have a crack at our fiendishly difficult Harry Potter quiz and see if your knowledge of the books is “Outstanding” or “Awful”.