Shadows Over Camelot is a game that stands out due to its unique mechanism called the Traitor Mechanism. This mechanism adds a twist to the cooperative gameplay by introducing the possibility of a traitor among the players. The traitor secretly works against the group's goal of completing quests and protecting Camelot. This element of secrecy and mistrust adds excitement and tension to the game, as players try to deduce who the traitor is without revealing their own loyalty. This mechanism enhances the overall experience of the game and makes it a favorite among players.