Mortal Kombat 9 (2011) was never officially released for the Sony PSP, many fans enjoy a similar experience through a heavily modified version of Mortal Kombat Unchained . These community "MK9 Mods" for the PPSSPP Emulator
Purchase a used copy of Mortal Kombat: Unchained on eBay ($10–15). Then, patch it yourself using community tools (search "MK9 mod for Unchained PPSSPP"). This supports preservation and keeps you safe legally. mortal kombat 9 ppsspp iso download upd better