In Yu-Gi-Oh! Duel Monsters EX 3 and Yu-Gi-Oh! World Championship Tournament 2004, the Duel Computer is a level 6 opponent. It is unlocked by defeating all the level 5 opponents at least fifteen times each, and then defeating Seto Kaiba three times in a row. The fourth time, the player challenges Kaiba, they will face the Duel Computer instead.