was a retail disc release and not a small WiiWare title, it is too large to be contained in a standard playable WAD; instead, it is usually managed as an Understanding WADs vs. Game Files WAD Files as Forwarders : Most "Super Mario Galaxy 2 WADs" found online are Forwarder Channels
Navigate to your wad folder. Select Super Mario Galaxy 2 . Press the + button to install. Wait for the progress bar. It should read "Installing ticket... OK" and "Installing content... OK." Super Mario Galaxy 2 Wad File