A "Shadow Game" where losing monster battle results in the duelist losing their memories of specific friends. Key Duel Highlights
Marik transforms the duel into a magical contest where memories are literally erased from the mind when monsters are destroyed. Yu-Gi-Oh! Duel Monsters (Dub) Episode 90
Mind Game, Part 1 (or "Mind Game: Mai vs. Marik (1)"). The Duel: Mai Valentine vs. Yami Marik. A "Shadow Game" where losing monster battle results