Have you tried any of the major modding projects for this game? Let us know your favorite custom levels in the comments!
Finding a .wad file is a bit of a technical rabbit hole, as this specific game was originally a physical disc release rather than a digital WiiWare or Virtual Console title. Understanding .wad vs. .iso / .wbfs New Super Mario Bros Wii Wad File
"Must be a bad dump," Leo said, reaching for the power button on the console. Have you tried any of the major modding