UFC: Sudden Impact known in Japan as UFC 2004 is a mixed martial arts video game featuring Ultimate Fighting Championship properties and fighters developed by Opus and published by Global Star. It was released in 2004 for the PlayStation 2. It is the fourth UFC game released and the second and last on the PlayStation 2. The gameplay in Sudden Impact is very similar to that of the previous entries in the series. Each fighter possess a fighting style that varies between Boxing Karate Kung-Fu Kempo Muay Thai Ninjitsu Sambo Submission Sumo Pro Wrestling Kickboxing Wrestling Brazilian Jiu-Jitsu and more. Each of the four face buttons on the controller specifically controls one of the fighter's limbs. By hitting two buttons at once the player can perform a takedown a grappling move a submission move or other similar technique. An addition made to Sudden Impact's gameplay is an added focus on fence positioning. When backing an opponent into the cage that surrounds the Octagon ring attempting a grapple maneuver will put the player into one of several different possible positions including a standing face-off as well as a special ground-mount where the bottom fighter's head is literally pressed against the cage. The overall gameplay is also slightly faster in comparison to the previous games. Fights are announced by Bruce Buffer and refereed by "Big" John McCarthy.