There is no official release of (2011) for the Sony PSP. The game was released for PlayStation 3, Xbox 360, and PC, with a handheld port exclusive to the PlayStation Vita .
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Once you have downloaded your verified, highly compressed ISO file, follow these steps to play: Mortal Kombat 9 There is no official release
Websites claiming to offer a "highly compressed verified" ISO for MK9 on PSP are likely providing either a different game or potentially harmful files. Official Mortal Kombat Options for PSP highly compressed ISO file