: Retro-inspired costumes originating from the original Mortal Kombat , Mortal Kombat II , and Ultimate Mortal Kombat 3 .

Unlike the Xbox 360 version (which used simple TU files), the PS3 version of MK9 requires specific installation files. These contain the character models, move lists, and compatibility patches. Without them, you cannot play against someone who has the DLC online (or via ad-hoc).