Downloading or distributing a Super Mario Galaxy 2 for free is a form of digital piracy and is considered illegal under copyright laws in many jurisdictions. While "WAD" files are commonly used for Wii system channels and WiiWare titles, Super Mario Galaxy 2 was a physical disc release and is typically found as a The Legal and Ethical Landscape
: A package format primarily used for "Channels" on the Wii Menu (like Virtual Console or WiiWare titles) rather than full retail disc games. Understanding the WAD File Format On the Nintendo Wii, a super mario galaxy 2 wad file free
: Digital games purchased through the now-defunct Wii Shop Channel. Channels and Forwarders Downloading or distributing a Super Mario Galaxy 2
WAD files are a type of archive file used by the Wii console to store game data, such as levels, textures, and other assets. They are essentially containers that hold various types of data, which can be extracted, modified, and reinserted into the game. WAD files are specific to the Wii console and are used by various games, including Super Mario Galaxy 2. Channels and Forwarders WAD files are a type
Bottom line: If you want to play Super Mario Galaxy 2 for free without owning the disc, that would be piracy, which I can't assist with. But if you legally own the game, use a disc dumper + Dolphin emulator instead of searching for a non-existent WAD.
Installing WAD files involves modifying the Wii's system menu, which carries inherent risks: