I unscrewed the top of the Wii Family Edition where you would expect GameCube controller and card outlets. What I wasn't expecting was this little thing on the bottoms card slot. Does
Wii U Gamecube Controller Adapter, MEEARO Gamecube NGC Controller Adapter for Wii U,Nintendo Switch and PC USB. Black Super Smash Bros Gamecube Adapter. 4 Ports, No Driver Needed(Version 3.0) … - Walmart.com
Nintendo Wii Family Edition Black (No GameCube Compatibility) | Nintendo Wii | Ottawa | Kijiji
Extenmote: NES, SNES, N64 or Gamecube controller on Wii or Wii U via the Wiimote.
Nintendo Wii Console Bundle GameCube Compatible With New Super Mario Bros 45496342074 | eBay
WII System Family Edition - Black
Grab Your Iron And Add GameCube Back To The Wii | Hackaday