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Retro Controller Hub - 4 Port GameCube Controller Adapter , Nyko, Nintendo Switch 743840872665 - Walmart.com
Nintendo Gamecube Modem Adapter
Nintendo Support: How to Use the GameCube Controller With Nintendo Switch
How to use your GameCube controller with Nintendo Switch | iMore
8bitdo Gbros adapter turns any Gamecube controller into a Wavebird for Switch | Shacknews
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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