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NEXiLUX Nintendo Switch GameCube Controller Adapter for Wii U, PC USB – J&L Video Games New York City
Wii U's GameCube Adapter Will Only Work with Smash Bros. - GAMING TREND
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This Portable GameCube Controller Switch Adapter Hits Kickstarter Next Month | Nintendo Life
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raphnet. - Gamecube to USB adapter - V3
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Nintendo Support: How to Use the GameCube Controller With Nintendo Switch
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GameCube Controller Adapter For Wii PC and Nintendo Switch
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Wii U 4 Port Gamecube Controller Adapter
Gamecube Controller Adapter for Nintendo Switch | Hand Held Legend
Nintendo GameCube Controller Adapter for Nintendo Switch - Walmart.com
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GameCube Controller Adapter for Wii U, Nintendo Switch and PC USB by L
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TTX Tech GameCube Controller Adapter for Wii U and Switch - Micro Center
8Bitdo GBros (Wireless Switch Adapter for Gamecube Controller) - us.MaxGaming.com
Ultimate GameCube Adapter by Panda Hardware — Kickstarter
GameCube Controller Adapter for Wii U, Nintendo Switch and PC USB – Lexuma
You can use the Smash Brothers Gamecube adapter in portable mode with a USB C adapter (Rumble works too) : r/NintendoSwitch
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Best Nintendo Switch GameCube Controller Adapters | Digital Trends