Harry Potter and the Prisoner of Azkaban: This map is infamous for how many secrets it holds, designed by Padfoot, Moony, Wormtail, and Prongs.
What is the Marauder's Map?
Harry Potter and the Half-Blood Prince: This is the result of splitting a soul and placing it into an object (typically inanimate).
What is a Horcrux?
Harry Potter and the Prisoner of Azkaban: The iconic sweets shop.
What is Honeydukes?
Harry Potter and the Philosopher's Stone: This kind of accident is what the Dursleys told Harry his parents had died in.
What is a car crash?
Harry Potter and the Philosopher's Stone: The Sorting Hat nearly placed this character into the Ravenclaw House, but changed its mind and put them into Gryffindor.
Who is Hermione Granger?
Harry Potter and the Goblet of Fire: Over 100 of these creatures, including one named Winky, are always working in the Hogwarts Kitchens.
What are house elves?
Harry Potter and the Chamber of Secrets: The Diagon Alley, but for Dark Magic folks.
What is Knockturn Alley?
Harry Potter and the Philosopher's Stone: The name of the train that takes students to and from Hogwarts School of Witchcraft and Wizardry.
Harry Potter and the Philosopher's Stone: The names of Harry's parents.
What is Lily and James Potter?
Harry Potter and the Chamber of Secrets: This person is deathly afraid of spiders.
Who is Ron Weasley?
Harry Potter and the Philosopher's Stone: There are 142 of these in the castle of Hogwarts.
Hint: They're constantly moving!
What are staircases?
Harry Potter and the Chamber of Secrets: This evil artefact nearly killed Katie Bell when she accidentally touched it.
Genius Point: What is the Cursed Opal Necklace?
Harry Potter and the Prisoner of Azkaban: The pub, named after a kind of Quidditch equipment.
What is the Three Broomsticks?
Genius Point: What is the Three Broomsticks, home of Butterbeer?
Harry Potter and the Deathly Hallows Parts 1 & 2: Harry was accidentally made into this when He-Who-Must-Not-Be-Named attempted to murder him.
What is a Horcrux?
Genius Point: What is the 7th Horcrux?
Harry Potter and the Goblet of Fire: This person's favorite subject was Herbology, and they later became the Herbology professor at Hogwarts.
Who is Neville Longbottom?
Harry Potter and the Prisoner of Azkaban: This is what guards a secret passageway to the basement of Honeydukes, as Harry sees on the Marauder's Map in his third year at Hogwarts.
What is the One-Eyed Witch?
Harry Potter and the Deathly Hallows Parts 1 & 2: This artefact is used to smuggle Death Eaters during the Second Wizarding War, and is stored in the Room of Requirement. Notoriously used by Draco Malfoy.
What is the Vanishing Cabinet?
Genius Point: What is the pair of Vanishing Cabinets in the Room of Requirement and Knockturn Alley?
Harry Potter and the Prisoner of Azkaban: This is the only joke shop in Hogsmeade.
What is Zonkos Joke Shop?
Harry Potter and the Philosopher's Stone: This is the exact address of Harry's Muggle family's house.
What is 4, Privet Drive?
Genius Point: What is 4, Privet Drive, Little Whinging, Surrey?
Harry Potter and the Philosopher's Stone: This half-sized professor teaches Charms.
Who is Professor Flitwick?
Genius Point: Who is Filius Flitwick?
Harry Potter and the Goblet of Fire: A secret civilization of this species inhabits the Great Lake of Hogwarts.
Harry Potter and the Prisoner of Azkaban: This is the name of a follower of Voldemort.
What is a Death Eater?
Harry Potter and the Prisoner of Azkaban: This is the name of the clothing shop in Hogsmeade (not to be confused with Madam Malkin's in Diagon Alley).
Harry Potter and the Deathly Hallows: Part 2: The job Harry took up after he graduated Hogwarts.
What is an Auror?
Harry Potter and the Chamber of Secrets: This professor lost all his memory in the Chamber of Secrets when a spell rebounded.
Who is Professor Lockhart?
Genius Point: Who is Gilderoy Lockhart?