Ultima Dimension

The Ultima Dimension (ウルティマ次元 Urutima Jigen) is the Dimension where all Duelists use Ultima Cards. In this world, Dueling was deemed illegal after a certain event, and thus eventually moved into the "Underworld Circuit",and underground place where Duelists gather. Here, Dueling is used as a means of gambling.

's counterpart in this Dimension is Yuda, a young, wealthy, slick-talking Duelists who has been on a never-ending winning steak for the past few years.