Mortal Kombat 9 (2011) was for the PlayStation Portable (PSP) and, therefore, a native "PPSSPP ISO" for the original game does not exist. The files found online under this description are typically fan-made mods of Mortal Kombat: Unchained or modified versions of other PSP fighting games. The Reality of "Mortal Kombat 9 PPSSPP"
: Creators add custom textures, UI skins, and sometimes character models to make the game look like MK9, but the core gameplay, moves, and engine remain those of the older 3D-era titles. Mortal Kombat 9 (2011) was for the PlayStation
If you are looking for a similar experience on the PPSSPP emulator, most "highly compressed" MK9 downloads you find online are typically one of two things: 1. Mortal Kombat: Unchained (Official) If you are looking for a similar experience
Iconic Roster: Play as Scorpion, Sub-Zero, Raiden, and Johnny Cage with updated moves. and Johnny Cage with updated moves.