MayFlash Gamecube to Wii & Wii U Adapter - YouTube
Gamecube Controller Adapter for Wii U - Solaris Japan
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TTX Tech GameCube Controller Adapter for Wii U and Switch - Micro Center
Guide to the Best GameCube Controller Adapter for Nintendo Switch
Amazon.com: Hyperkin 4-Port Controller Adapter for GameCube Compatible with Nintendo Switch/ Wii U/ PC : Video Games
Amazon.com: Mayflash GameCube Controller Adapter for Wii & Wii U (Dual Pack), White : Video Games
SNES / NES to Gamecube Controller Adapter Nintendo Wii Switch - Etsy
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GameCube Controller Adapter for Wii U + Nintendo Switch [Nintendo Acce — MyShopville
Wii U can use two GameCube controller adapters
Confirmed: The Wii U GameCube Controller Adapter will not work on DDR, Active Life, or Cyberbike | Gaming.Fit
NGC GameCube Controller Adapter Converter for Nintendo Switch/Wii U/PC USB | eBay
raphnet. - Classic controller to Gamecube/Wii adapter
Mayflash GameCube Controller Adapter for Wii U and PC USB (4 Port) - Walmart.com