Dead or Alive Ultimate is a compilation game that includes an enhanced version of Dead or Alive 1 and a remade version of Dead or Alive 2 with re-developed graphics and new stages for the Xbox gaming system. It includes the original Sega Saturn version of Dead or Alive 1, with smoothed graphics, but lacks the additional content received in the later-released North American PlayStation version (no Bass or Ayane characters or extra costumes). Both editions include online play.
Dead or Alive 1 Ultimate is essentially identical to its original Sega Saturn version, and is generally considered more of a collector's disc than for its content. Dead or Alive 2 Ultimate, being a remake created after the debut of Dead or Alive 3, takes elements and mechanics from both its original iteration and successor. The action of 3D-axis movement is as free-formatted as DOA3, and Hitomi is now a playable character albeit outside story mode. Other elements have been kept intact from DOA2. These include higher damaging counters than in DOA3, environmental hazards not warranting a knockout on a character, and a counter mechanism that is much harder to execute. Despite being able to freely move on a 3D axis in the Ultimate version of DOA2 however, most moves cannot be sidestepped as in DOA3 and other 3D fighters. Another major change is in the revamped holding system in DOA2 Ultimate. The final major set of changes instituted in 2 Ultimate is the inclusion of slopes, which are a type of environmental hazard where those knocked down them roll down the slope, taking damage as they fall.