The Dome Duel Arena was the structure at the top of the first Kaiba Land.
The dome is in the center of a giant arena at the top of the Kaiba Land building, with the previous Death-T stages below it. Two bridges at either side lead into the it.
The dome was the arena for the Yugi Mutou and Seto Kaiba's game of Duel Monsters in the final stage of Death-T. Yugi faced Kaiba as Dark Yugi, using his Grandfather's Deck. Yugi managed to win, using "Exodia" and inflicted the "Mind Crush" Penalty Game on Kaiba.