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Hyperkin Wii U ProCube Wireless Controller for Nintendo Wii U - Purple – Gametronex.com
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Amazon.com: Hyperkin ProCube Wireless Controller for Wii U (White) : Everything Else
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Nintendo Super Famicom Style Digital Controller Pad for Nintendo Gamecube Switch & Wii U / Switch Controller Adapter SFC GCN (B) – Retro Games Japan
Gamecube Controller Adapter for Wii U - Solaris Japan
Innex Wavedash Wireless Controller GameCube/Wii/Wii U - Black - Micro Center
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Is it possible to mod your Wii U to connect to the wireless switch GameCube controller? : r/WiiUHacks
Nintendo GameCube Controller – Super Smash Bros. Edition for Wii U – Pika Dude
