Playing custom Wii mods requires a specific setup. You cannot simply download a standard "ROM" file and run it like a traditional emulated game. To protect your hardware and comply with safety standards, you must patch a legitimate copy of the original game. System Requirements
: Turn the Retro Remix option to "Enabled" and press "Launch." Safety and Legality Notice new super mario bros wii retro remix rom download 2021
Based on player feedback and gameplay documentation around 2021: : Playing custom Wii mods requires a specific setup