It sounds like you’re referring to Genesis Plus GX — a popular open-source Sega Genesis/Mega Drive, Master System, Game Gear, and SG-1000 emulator — and specifically asking about a WAD file version of it.
System Compatibility: Designed for the original Wii and the Virtual Wii (vWii) on Wii U.
Step 3: Launch a WAD Manager Insert the SD card into your Wii. Launch the Homebrew Channel, then launch your WAD Manager (e.g., MMM). genesis plus gx wad
Installing a Genesis Plus GX WAD on your Nintendo Wii creates a "Forwarder Channel," allowing you to launch the emulator directly from the Wii System Menu without opening the Homebrew Channel first. What is a Genesis Plus GX WAD?
Controller Support: Works with Wii Remotes, Nunchucks, Classic Controllers, and GameCube controllers. It sounds like you’re referring to Genesis Plus
The Genesis Plus GX WAD transforms the Wii into a dedicated Sega emulation console. While the Homebrew Channel method remains safer and more flexible for developers, the WAD approach offers a polished, appliance-like experience. For the cautious user, installing a well-constructed WAD from a trusted source (or building it yourself using the steps above) yields an excellent retro gaming machine.
Additional Resources
Note: Distribution of ROMs is legally sensitive; WADs that include copyrighted ROMs may violate law. Many WADs are created as personal backups or for homebrew development.
Support for Sega CD BIOS, high-quality audio filtering, cheat codes, and customizable display settings. Launch the Homebrew Channel, then launch your WAD Manager (e