Buy The mayflash gamecube Controller Adapter for Switch allows you to connect up to two gamecube controllers (or wireless gamecube controllers) to a Wii U system and PC USB. Switch to “Wii U” or “PC” mode by using the switch located on the side. Supports the GC/Wii Emulator Dolphin.

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https://www.supremegamegear.com/products/mayflash-2-port-gamecube-gc-controller-adapter-converter-for-wii-u-pc-usb