Trial of the Mind

Dark Yugi and Shadi's Shadow Game was a Shadow Game in the Yu-Gi-Oh! manga and first series anime, which Shadi used to test Dark Yugi.

Prior events
Shadi came to Japan to put Professor Kanekura and Professor Yoshimori on trial for an excavation they carried out in the Valley of the Kings, which he saw this as trespassing on the territory of the gods. After killing Kanekura in a Weighing of the Heart Shadow Game, Shadi found the Millennium Puzzle on his desk and soon discovered it had been solved by Yugi Mutou.

Shadi entered Yugi's soul room using the Millennium Key in order to test Yugi, but instead became tested by Yugi's alter-ego Dark Yugi as his search for Dark Yugi's true soul room as turned into a Shadow Game. Shadi lost the Shadow Game, but was spared by Dark Yugi, who said that their game had really only just begun. When he left Yugi's soul room, he learned that Yugi was unaware of Dark Yugi's existence and returned the Millennium Puzzle to him.

Shadi prepared to put Yoshimori on trial later that day. However after entering his soul room, Shadi learned that Yoshimori was expecting a visit from a group of people, including Yugi. Shadi saw this as his chance to test Yugi and planned a Shadow Game, involving using Yoshimori as an instrument.

Setup
Shadi used his Marionette Design to redecorate Yoshimori's soul room, turning him into a zombie with the intention of making Yugi's friends suffer.

Yugi, Sugoroku, Anzu and Jonouchi visited Yoshimori in his laboratory at Domino University, hoping to comfort him after Kanekura's death. They were greeted by the zombified Yoshimori and suspected something was up when he claimed that someone killed Kanekura. Yoshimori then tried to strangle Jonouchi, which Shadi suspected would cause Dark Yugi to emerge. Unable to pull Yoshimori off Jonouchi, Anzu grabbed a globe and walloped him in the face, knocking out three of his teeth and causing him to let go.

As Yoshimori proceeded to chase Yugi and his friends, Shadi thought that possessing Yoshimori alone might not be enough and decided to redecorate Anzu's soul room too.

Yoshimori knocked Sugoroku out and was then lured out of the room by Jonouchi. With everyone else gone, Shadi showed Yugi that he had possessed Anzu. Shadi ordered Dark Yugi to come out and explained that Anzu will only do what he commands her and will even die if he gives the order. With that Dark Yugi appeared.

Everything Shadi needed to set up the game was in the laboratory and he instructed Dark Yugi to meet him on the roof in ten minutes at eight o'clock.