アーマード・コアシリーズ
"" was released as a stand-alone expansion to the original game, released on December 4, 1997. "Project Phantasma" introduced an Arena mechanic that would be expanded on in later titles, as well as an import mechanic that would become an important feature through the franchise. Players were able to import save data from earlier "Armored Core" games and bring their existing Armored Core units into the expansions.