of the Stone. A large chessboard with an army of large chessmen, transfigured by McGonagall. To continue to the door on the opposite side, the person in question must beat the chessmen at a game of wizards' chess where the player must risk his life if he loses. Ron and Professor Quirrell are the only wizards to win the game of wizards' chess. A room with a large troll inside. This is Quirrell's challenge. In the book, Quirrell had knocked out his own troll to get to the last room and thus the trio did not have to fight it; in the film, it does not appear, but it appears in the PS1 and Game Boy Color version of the game. A series of potions, brewed by Snape. A logical riddle, not magic, has to be solved. There are two doors, blocked by fire. One potion will allow the person to exit the way he or she arrived, another will allow him or her to continue to the next chamber, two are nettle wine, and the other three are poison. This challenge does not appear in the film, but does in the video game adaptation. The Mirror of Erised can be found in the final chamber, further enchanted by Dumbledore to bestow the Philosopher's Stone upon a seeker only hoping to acquire the stone but not use it for selfish means. Chamber of Secrets The Chamber of Secrets, which is deep under the school (most likely under the lake), was home to an ancient Basilisk, intended to be used to purge the school of Muggle-born students. Salazar Slytherin, one of the founders of Hogwarts, built the Chamber before he left the school. The entrance to the Chamber is hidden in the second-floor girls' lavatory (haunted by Moaning Myrtle). One of the sink taps has a snake scratched into its side; when a command in Parseltongue is spoken, it opens to reveal the mouth of a dark, slimy chute, wide enough to slide down, that gives onto a stone tunnel. There are many skeletons of small animals littering the floor and even a gigantic skin shed by the Basilisk. The tunnel leads to a solid wall, carved with two entwined serpents with emeralds for eyes. At a command in Parseltongue, the wall opens to expose a long, dim corridor, lined with monumental statues of snakes, including two rows of towering stone