Labyrinth Treasure Hunt The Labyrinth Treasure Hunt was an event in the " Yu - Gi - Oh ! " manga , first series anime and second series anime , where Shadi ' s search for Yami Yugi ' s soul room was turned into a Shadow Game . In the manga and first series anime , this takes place after the Egypt Unearthed exhibition , before Yugi is conscious of Dark Yugi ' s ( Yami Yugi ' s ) existence . In the second series anime , this takes place under altered circumstances after Duelist Kingdom when Yugi is aware of Yami Yugi ' s existence . Manga events . Prior events . Shadi found the Millennium Puzzle in Curator Kanekura ' s office after performing the Question of Truth Shadow Game on Kanekura . As he was leaving the museum , he bumped into Yugi . Yugi asked Shadi if he had seen Kanekura and explained that Kanekura ' s was supposed to be returning the Millennium Puzzle to him . Shadi was surprised that Yugi might be the one who solved the Millennium Puzzle , so he used his Millennium Key to look inside Yugi ' s soul room . Inside Shadi was surprised to find two soul rooms ; one belonging to Yugi , which was filled with toys , and a more sinister - looking room that belonged to Dark Yugi . Dark Yugi was in his soul room and asked why Shadi had come . Shadi explained that he had come to learn the power of the Millennium Puzzle . Dark Yugi replied that the power Shadi spoke of does rest in his soul room , but he wasn ' t going to let him see it that easily and challenged him to a game . The game . The rules of the game were that Dark Yugi ' s true soul room existed somewhere within his soul and if Shadi could find it , he could then see the power that he seeks . Shadi mentioned that when he enters someone ' s soul room , he can " redecorate " , which can let him control the person and even destroy their personality . He then accepted the challenge . Dark Yugi warned Shadi not to think that the game was easy as it is much more dangerous than he thinks . In order to find the true room , Shadi began opening the doors one by one . On opening the first one , a stone pillar was dropped from above , which Shadi barely managed to dodge . Dark Yugi laughed and asked if Shadi gave up . He then disappeared through a wall , telling Shadi that he would be waiting in the true room . Shadi continued to search . He understood that the soul was tightly closed against strangers and set to confuse him , but he was determined to find the room . Eventually , he found a room , where Dark Yugi was sitting on a throne . He wondered if this was the true room , but as he approached Dark Yugi , the floor under him began to collapse , leaving him dangling from one hand . If he fell , he would be trapped in Dark Yugi ' s soul forever . However Dark Yugi held out his hand and helped Shadi back up . Aftermath . Although he saved Shadi , Dark Yugi still insisted that Shadi leave . Shadi accepted defeat and began to leave . However , Yugi corrected him saying that their game was only beginning . Shadi then returned to the museum , where Yugi was still standing in front of him . He realized that he had entered Yugi ' s soul room with the intention of testing him , but wound up being the one tested . He returned the Millennium Puzzle to Yugi , who thanked him . Shadi insisted that he should be the one thanking Yugi , but Yugi didn ' t understand why that was . As Shadi tried to explain , Yugi laughed at the idea of there being another Yugi . Shadi realized that Yugi was unaware of his other self ' s existence , so he told Yugi that he must learn about his other self in order to solve the true riddle of the Millennium Puzzle , which is the duty of the one who solved the Millennium Puzzle . Before parting he told Yugi his name , which he claimed to have never told anyone before . Shadi then left , planning to put Professor Yoshimori on trial before returning to test Dark Yugi .