An ISO file is an image file that contains the exact copy of a game or software, including its file system, metadata, and data. In the case of a Super Mario ISO file for PSP, it allows users to play the game on their PSP console without needing the original UMD (Universal Media Disc).
You may see videos or downloads for New Super Mario Bros. PSP . This is . It’s a popular fan-made homebrew game created by a developer named Flame . It features original levels, power-ups, and graphics inspired by the DS classic. It’s a standalone homebrew .iso or .cso file that runs on CFW PSPs. This is legal as long as it contains no copyrighted Nintendo code (which it shouldn’t, if it’s original work). super mario iso file for psp