While is a well-known retail title for the Nintendo Wii, it is important to clarify that it was never released as a digital-exclusive WAD or through the Wii Shop Channel. The game was distributed exclusively as a physical disc starting in March 2012.
While there is no "exclusive" official digital version, the term "WAD" is commonly used in the homebrew community to refer to custom-made shortcuts for the Wii Menu. Key Release Facts mario party 9 wii wad exclusive