Duelist Kingdom ( island ) Duelist Kingdom is a private island owned by Maximillion Pegasus . It constitutes the location of the Duelist Kingdom tournament . It is a remote island in the approximately 5 km wide . History . During the , the island was occupied by the U . S . military . Troops that died were buried in the caves under the island . Maximillion Pegasus later came into ownership of the island and used as his own private residence . He sometimes invited others over to discuss business deals . Seto Kaiba visited the island to celebrate the completion of the holographic Duel Monsters technology , and Duke Devlin went to demonstrate Dungeon Dice Monsters to Pegasus . Pegasus and The Big Five brought Mokuba there after kidnapping him in the Duelist Kingdom arc as they attempted to gain control of KaibaCorp . Pegasus used the island to host the Duelist Kingdom tournament . For the tournament , he had various Dueling Arenas ( Battle Boxes in the manga ) set up across the island . During the tournament , Kaiba made his way to the island to take Mokuba back . Pegasus forced Kaiba to Duel both Yugi and him for the chance to save Mokuba . After Pegasus lost to Yugi at the end of the tournament , Yami Bakura attacked him and stole his Millennium Eye . In the manga , this killed Pegasus . Locations . Pegasus Castle . Pegasus Castle was situated on the top of a hill . In the anime , it was given a much longer staircase to the top . The Duelist Kingdom tournament finals took place here . To gain entry , a duelist must insert 10 Star Chips into a lock . This rule also applied to visitors wishing to see Pegasus during the tournament , including Seto Kaiba . Underground . The island has underground caverns . Bandit Keith managed to find the way into them . He and his goons ganged - up on Joey Wheeler and pulled him into them . Inside the caverns were two main passages ; one led to the graveyard , and the other led to the labyrinth . In the anime , the tunnels were lined with traps , such as a fake giant boulder , which rolled through the tunnels after someone stepped on a trap . Joey was forced to Duel against Bonz in the graveyard . After he won , Keith had Bonz , Sid and Zygor trap Joey and his friends inside by pushing a large boulder in front of the entrance . To escape , they had to make their way to the labyrinth . Bakura was able to navigate through the tunnels in the direction of Pegasus castle , since his Millennium Ring was pointing at Pegasus ' Millennium Eye . Graveyard . The graveyard , called the crypt in the manga , was where Joey was forced to Duel Bonz . The area was lined with skulls and gravestones . In the manga it had a Battle Box , while in the anime it had a Dueling Arena . Zombie - Type monsters were given a Field Power Bonus here . Bonz was given an advantage , since he made a Zombie Deck beforehand , but Joey managed to beat him . Labyrinth . The edges of the tunnel become smoother and straighten out into solid walls as the tunnels become the labyrinth maze . Past the maze is another dueling arena , where the Eliminators , the Paradox Brothers , waited . This arena was set up for Labyrinth Duel s . Past them was the exit to surface just outside the castle . In order to leave , entrants must defeat the Paradox Brothers in a Duel and choose from one of two doors , only one of which they said led out . In reality , both doors went to the same place , and the brothers tried to trick the players into thinking whichever door they picked was the wrong one .