If the emulation hassle seems too great, why not play native PSP games that capture the spirit of Mario? These are official ISOs you can legally buy on UMD or from the PlayStation Store:
This is the holy grail. A developer managed to reverse-engineer Super Mario 64 and port it natively to the PSP. This isn't emulation; it runs directly on the hardware. super mario iso file for psp
This is the most common search intent. You want to play Super Mario World (SNES), Super Mario 64 (N64), or Super Mario Bros (NES) on your PSP. In this case, you are not looking for a "Mario ISO" specifically made for the PSP. You are looking for a (for cartridge games) or an ISO (for disc games) that runs through an emulator program installed on the PSP. If the emulation hassle seems too great, why
Fan-made Mario clones built specifically for the PSP. Playing Classic Mario via Emulators This isn't emulation; it runs directly on the hardware
You are now playing Super Mario on a PSP, but you did not use a "Mario ISO."