[PSP] Mortal Kombat Unchained (USA) : Midway Games, Inc. : Free Download, Borrow, and Streaming : Internet Archive. Internet Archive
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Many mods include "guest" fighters like Joker, Spawn, or Terminator. [PSP] Mortal Kombat Unchained (USA) : Midway Games, Inc
Look for reputable fan sites or community forums like Approm.cc or PPSSPPZip that host the highly compressed MK11 mod files. Inc. : Free Download
Because these are fan-made mods, you might encounter a few bugs or graphical glitches. Always make sure to enable in the PPSSPP settings if you experience lag.