Despite the addition of four new characters, Armor Ralf has been removed, as have several stages, as well as the story and challenge modes from Maximum Impact 2. In addition, all of the characters have lost half of their outfits in both normal and alternate types. Some new music, including songs from the original Maximum Impact and Sengoku 3, have been added, in addition to new alternate versions of stages and a new level for Makoto Mizoguchi.

The game was also released for the PlayStation 2 in Japan, on July 26th, 2007. It was planned for release in the U.S. along with RA2 but was cancelled due to the timing of KOF:XII