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.
Harry Potter & The Philosopher's Stone is 20 today.Harry Potter & The Philosopher's Stone is 20 today.
Harry Potter & The Philosopher's Stone is 20 today.

Since its publication in 1997, a box-office breaking film franchise has followed, but it’s the book series that most fans remain fiercely loyal to.

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”.