His grandson, Jin Kazama, possesses the Devil gene but has been missing since the previous tournament. The experiment fails since Heihachi lacks the Devil gene. Two years after the King of Iron Fist Tournament 3, Heihachi Mishima and his scientists have captured samples of Ogre's blood and tissue to splice with Heihachi's genome, in order to make him immortal.
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The game also harbored many gameplay revisions, such as the series-unique ability for the player to move about before the round begins and the introduction of walled stages. Placing distinction on the plot in the console version, the tone of Tekken 4 was noticeably darker than other installments of the series. It was released as an arcade game in 2001 and on the PlayStation 2 in 2002. Tekken 4 ( 鉄拳4) is a 2001 fighting video game developed and published by Namco as the fourth main and fifth installment in the Tekken series, following the release of the non-canon crossover titled Tekken Tag Tournament for the arcades, during the summer of 1999.