Multiple choice general knowledge What creature guards the gate of Sorcerer's stone? 3 Headed snake 3 Headed Dog 2 Headed Dog 2 Headed snake Reveal answer Fill a bubble to check yourself B Correct answer Explanation The Sorcerer's Stone is guarded by Fluffy, a massive three-headed dog belonging to Hagrid. The three-headed dog (Cerberus) is from Greek mythology and prevents anyone from passing through the trapdoor.