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GameCube Controller Adapter 4 Port Compatible with Nintendo Switch Wii U & PC USB
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GameCube Controller Adapter for Wii U & PC USB for Windows, Wii U
How to use the Official GameCube Controller Adapter for Wii U in Dolphin - Dolphin Emulator Wiki
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MayFlash 4 Ports GameCube Controller Adapter for Wii U & PC USB (W012) – SupremeGameGear
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