Yu - Gi - Oh ! - Episode 019 " Double Trouble Duel , Part 1 " , known as " Tag - Duel in the Labyrinth " in the Japanese version , is the nineteenth episode of the " Yu - Gi - Oh ! " second series anime . It first aired in Japan on August 29 , 2000 and in the United States on March 16 , 2002 . Summary . In the cave , Yugi and the group have no way of removing the boulder blocking the entrance . Suddenly , Bakura ' s Millennium Ring starts to point , presumably towards Pegasus ' s Millennium Eye . Following where the ring points , they end up at a large Dueling Arena , where the Paradox Brothers appear . They say that Yugi and a partner from his group have to face them in a tag - team Duel . If they win , they will have to choose one of the two doors the brothers guard . One door leads them out of the Paradox Brothers ' dungeon , while the other leads to a even larger maze that is impossible to get out of . Yugi and Joey agree to the conditions , betting six Star Chip s between them , enough to gain them entrance to Pegasus Castle if they win . The rules are as follows : all four players start with 2000 Life Points each , and will move in turn , alternating between teams . However , if just one Duelist loses , his partner will also lose . Dox summon s " Labyrinth Wall " , which changes the Duel Arena into a maze . During the Duel , Para and Dox say that from now on , one brother will speak only the truth and the other will speak only lies ; they also offer Joey and Yugi the option to each ask one question . Joey is excited about this prospect , having heard a similar riddle before , and asks his question right away . Yugi , however , immediately recognizes the here , and waits to ask his question until later . Meanwhile , Mokuba , trapped in Pegasus ' s underground prison , is thinking about Seto Kaiba and what happened to them when they were younger . Kaiba , on the other hand , is outside , approaching Pegasus ' s castle . Featured Duel : Yami Yugi & Joey Wheeler vs . Para & Dox . Turn 1 : Dox Dox Normal Summon s " Labyrinth Wall " ( 0 / 3000 ) . During this Duel and exclusively in the anime , " Labyrinth Wall " acts like a Field Magic Card in addition to a monster . Once activated , " Labyrinth Wall " creates a 9×9 maze on the Dueling Arena that each player ' s monster must go through before they can reach the other side . Monsters can move a number of spaces equivalent to their Level . Monsters can attack each other inside the maze , but must be on tiles adjacent to one another . Turn 2 : Yami Yugi Yugi draws . He then Normal Summons " Beaver Warrior " ( 1200 / 1500 ) in Attack Position . Since it ' s a Level 4 monster , Yugi moves it 4 spaces inside the maze . Turn 3 : Para Para draws . He then activate s " Polymerization " to fuse " Shadow Ghoul " into " Labyrinth Wall " and Special Summon " Wall Shadow " ( 1600 / 3000 ) in Attack Position . " Wall Shadow " can travel through the walls of the maze instead of actual spaces , allowing it to strike any monster that is inside the labyrinth instantaneously . " Wall Shadow " attack s and destroy s " Beaver Warrior " ( Yugi : 2000 → 1600 LP ) . Turn 4 : Joey Joey draws . He then Normal Summons " Axe Raider " ( 1700 / 1150 ) in Attack Position and Set s a card . Turn 5 : Dox Dox draws . He then Sets " Jirai Gumo " on a space in the maze and Normal Summons " Labyrinth Tank " ( 2400 / 2400 ) in Attack Position . Since it ' s a Level 7 monster , Dox moves it 7 spaces inside the maze . Turn 6 : Yami Yugi Yugi draws . He then Normal Summons " Celtic Guardian " ( 1400 / 1200 ) in Attack Position . Since it ' s a Level 4 monster , he moves it 4 spaces inside the maze . Turn 7 : Para Para draws . " Wall Shadow " attacks " Celtic Guardian " , but Joey activates his face - down " Kunai with Chain " , equipping ito " Axe Raider " and increasing the ATK of " Celtic Guardian " and " Axe Raider " by 500 ( " Celtic Guardian : 1400 → 1900 / 1200 , " Axe Raider " : 1700 → 2200 / 1150 ) . " Celtic Guardian " destroys " Wall Shadow " ( Para : 2000 → 1700 LP ) . On Para ' s End Phase , the boost that " Celtic Guardian " got from " Kunai with Chain " expires ( " Celtic Guardian " : 1900 → 1400 / 1200 ) . Featured cards . The following cards appeared in this episode . Cards in italics debuted here .