<Li> Devil's Snare, grown by Professor Sprout . </Li> <Li> A room containing dozens of keys, charmed by Flitwick to sprout wings and fly near the ceiling . One of these keys will unlock the door to the next section . However, in the film adaptation, the keys attack the seeker of the Stone . </Li> <Li> 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 . </Li> <Li> 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 . </Li>

What is the meaning of each house in harry potter