Instructions
Press R3 at the build deck screen and enter the following passwords: 37689434 for Exodia's Head and A5CF6HSH for Exodia's left arm.
Place any of the following three monsters in a row in the graveyard slot machines to obtain the right leg of Exodia: 3 Berformet, 3 Gaia the Fierce Knight, 3 Insect Cannon, 3 Invigorations.
Reincarnate cards with a 5 Deck Cost or more to obtain the rest of the Exodia pieces. This will take multiple attempts, so always save before doing a reincarnation.