How to use the Official GameCube Controller Adapter for Wii U in Dolphin - Dolphin Emulator Wiki
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raphnet. - Dual Gamecube controller to USB adapter
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GameCube Controller Adapter for Wii U, Nintendo Switch and PC USB – Lexuma
How to Use a Gamecube Controller on Steam - What in Tech
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Switch GameCube Controller Adapter MayFlash
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4-Port Controller Adapter for GameCube® Compatible with Nintendo Switch® / Wii U® / PC/ Mac®
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The official Wii U GameCube adapter is still crazy stupid to find, here's a third-party one – Destructoid
GameCube® Controller Adapter - XYAB
How to Use a GameCube Controller on PC - Howchoo
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