If you choose the converted/reproduction route for PPSSPP, follow these steps:
Technically, , not a native PSP game. The PPSSPP emulator is designed specifically for PlayStation Portable (.ISO or .CSO) files. To play Tekken 3 via PPSSPP, you generally need a version of the game converted into a PSP EBOOT (.PBP) format or a specially modified "reproduction" ROM.
: Set "Rendering Resolution" to 2x PSP for a balance of clarity and speed.
If you have a standard PS1 ISO, it is highly recommended to use dedicated PS1 emulators like DuckStation or ePSXe , which are built to handle Tekken 3's specific architecture without crashes or graphical glitches.
: By configuring the Ad-hoc settings in PPSSPP, you can even play matches against friends over local Wi-Fi. Reddit·r/Tekken