Mind Crush (Penalty Game)

Mind Crush (マインド・クラッシュ, Maindo Kurasshu) was a Penalty Game that Dark Yugi inflicted on Seto Kaiba in the manga at the end of Death-T. It was used to metaphorically shatter Kaiba's heart, destroying the evil that corrupted it and leave him reassemble the broken heart as a puzzle. Physically Kaiba remained in a coma until he was ready to reawaken.

In the Yu-Gi-Oh! anime, the term "Mind Crush" has been used for all of Yami Yugi's (Dark Yugi's) Penalty Games, where it has the consequence of exorcising an evil spirit or rendering the victim unconscious.

In the Yu-Gi-Oh! ZEXAL manga, Kyoji Yagumo also inflicts a Penalty Game called Mind Crush on Eviluder, causing a spider to appear on his heart.

Original Mind Crush
Seto Kaiba forced Yugi Mutou to participate in Death-T, a theme park designed to kill him. Dark Yugi defeated Kaiba in a game of Duel Monsters in the final stage and inflicted the Mind Crush Penalty Game on him as punishment for his crimes. The part of Kaiba's soul that was filled with evil was destroyed and Kaiba was left motionless in his chair. Dark Yugi that Kaiba was now reassembling the broken puzzle of his heart, one piece at a time and with his own strength so that he would not make any mistakes. He told Mokuba Kaiba that Kaiba would return one day when he completed the puzzle. Mokuba, who had compared Kaiba's change in personality over the last few years to him being possessed by a gaming demon, was glad that Kaiba's evil part had been dispelled and promised to wait forever for him to wake up.

Kaiba spent the next few months in hospital and was sometimes visited by Yugi. The world's best doctors looked at him and thought that he could spend the rest of his life in the coma. He was later put under 24 hour care in Kaiba Manor. Over time, Mokuba came to resent Dark Yugi for doing this to him. Kaiba's absence also gave Maximillion J. Pegasus, an opportunity to takeover KaibaCorp.

The Ventriloquist of the Dead used a Kaiba puppet, which he pretended housed the soul of the real Kaiba and was seeking revenge on Dark Yugi. During Dark Yugi and the ventriloquist's Duel, the ventriloquist got the puppet to play Kaiba's cards, including "Blue-Eyes White Dragon". However the real Kaiba woke up from his coma during this Duel, causing the "Blue-Eyes White Dragon" to self-destruct and the ventriloquist to abandon his use of the puppet.

Despite his revival Kaiba maintained his cruel personality. However when he was saved from Pegasus by the Yugis, an apparition of his younger self appeared and led him to Mokuba. When the two of them were reunited, the apparition of Kaiba inserted the final piece into the puzzle of his heart.