GameCube Controller Adapter for Wii U, Nintendo Switch and PC USB – Lexuma
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Amazon.com: Mayflash GC Controller Adapter for Wii & Wii U (Dual Pack), White : Video Games
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Amazon.com: Mayflash GC Controller Adapter for Wii & Wii U (Dual Pack), White : Video Games
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Amazon.com: Y Team Controller Adapter for Gamecube, Compatible with Nintendo Switch, Super Smash Bros Switch Gamecube Adapter for WII U/PC with 4 Port : Video Games
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Mayflash GameCube Controller Adapter for Wii U and PC USB (4 Port) - Walmart.com
Amazon.com: Mayflash GameCube Controller Adapter for Wii U and PC USB, 4 Port 2-Pack : Video Games
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Does anyone have any experience with the Brook Gamecube Wii U Controller Adapter : r/DolphinEmulator
Tutorial: How to use your GameCube Controller Adapter for Wii U on the vWii - YouTube
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GameCube Controller Adapter for Wii U, Nintendo Switch and PC USB – Lexuma
GC Controller Adapter for Wii/Wii U (PLAY-ASIA.COM Edition) for Nintendo Wii, Wii U