The most common scenario is a heavily modded version of Mortal Kombat: Unchained , which was the official PSP port of Mortal Kombat: Deception (a PS2-era game). Modders use PPSSPP's custom texture-loading features to replace the character selection screens, HUD, and skins to look like Mortal Kombat 9 . While impressive, the underlying gameplay, combat mechanics, and graphics engine belong entirely to the older 2006 PSP game. 2. MUGEN Games Packaged as ISOs
Please note that you should only download from trusted sources to avoid any malware or viruses. The most common scenario is a heavily modded