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Unboxing Official GameCube Controller and Adapter for Switch! - YouTube
I figured out a way of connecting GameCube Controllers to Nintendo Switch without the Dock, all you need is a USB to USB C Adapter and Nintendo's New adjustable kickstand that's releasing
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GameCube Controller Adapter For Wii PC and Nintendo Switch
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4-Port Controller Adapter for GameCube® Compatible with Nintendo Switch® / Wii U® / PC/ Mac®
Gamecube Controllers Adapter (switch)
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