Death T - 5 Death T - 5 was the final stage of the Death - T theme park in the " Yu - Gi - Oh ! " manga and first series anime . It consisted of a game of " Duel Monsters " , enhanced by Solid Vision , played between Dark Yugi and Seto Kaiba . The game used an early set of rules , including players beginning with 2000 Life Points and some cards having different effects and properties . Direct attack s and Tribute Summon s had not been introduced at this point . Manga events . Prior events . Before taking part in Death - T , Grandpa gave Yugi his Deck to use defeat Kaiba with . After he and his friends passed the earlier stages of Death - T , Dark Yugi used the Deck for this Duel . Spectators from Death T - 4 rushed to the Dome Duel Arena to watch this Duel , unaware it was intended as a means of killing the Yugis . Jonouchi and Anzu , who were held at gunpoint were also brought here to see this . Kaiba Summoned " The Wicked Worm Beast " and attacked " Winged Dragon , Guardian of the Fortress " . Since it had the power of Flight , the " Winged Dragon " had a 35 % chance of evading the attack . It managed to dodge the attack and destroy " The Wicked Worm Beast " . The Duel . Since he ended his turn without any monsters on his side of the field , Kaiba got to Summon a monster in Defense Mode and choose " Saggi the Dark Clown " ( DEF : 1500 ) . Kaiba equipped " Saggi the Dark Clown " with " Dark Energy " ( ATK : 600 → 1800 ) and switched it to Attack Mode . " Saggi " attacked and destroyed " Winged Dragon , Guardian of the Fortress " ( Dark Yugi : 2000 → 1600 Life Points ) . " Saggi " attacked and destroyed " Sangan " . Kaiba draws and Summons " Blue - Eyes White Dragon " ( ATK : 3000 ) , which attacks and destroys " Gaia " ( Dark Yugi : 700 Life Points ) . " Blue - Eyes White Dragon " attacks and destroys " Imp " . Instead of attacking , Kaiba draws a card , which turns out to be another " Blue - Eyes White Dragon " . Kaiba Summons the second " Blue - Eyes White Dragon " . Kaiba Summons an unnamed kappa - like monster in Defense Mode . Kaiba Summoned " Judgeman " ( ATK : 2200 ) . Since " Judgeman " was Summoned after " Swords of Revealing Light " was played , it was able to attack and destroyed " Beaver Warrior " . Kaiba drew his third " Blue - Eyes White Dragon " , Summoned it and used it to attack and destroy " Dark Magician " ( Dark Yugi : 700 → 200 Life Points ) . Aftermath . To punish Seto Kaiba for his crimes Dark Yugi inflicted the Mind Crush Penalty Game on him , destroying the corrupted part of his heart . His body was left motionless , while inside he began reconstructing his heart properly . Jonouchi , Anzu and Johji were still at gunpoint , by Kaiba ' s guards , but Honda appeared and helped fight them off . One of the guards managed to get back his gun and threatened to kill Jonouchi . However Mokuba , who had rescued Honda previously arrived and told the guards to let them go . Anzu asked Mokuba why Seto went through all the trouble of creating Death - T just to get revenge . So Mokuba told Yugi and his friends how he and Seto had been adopted after Seto defeated Gozaburo Kaiba in chess by cheating and how Gozaburo vigorously pushed Seto to become his heir , unknowingly making Seto his enemy , who drove him to his suicide by taking control of KaibaCorp . Dark Yugi explained to Mokuba that Kaiba was rebuilding his heart and would return when he completes it .