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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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CORN Classic USB Wired NGC Controller For Nintendo Gamecube Joystick for Nintend NGC GC Control for MAC PC PC Gamepad - Newegg.com
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Gamecube Controller USB Adapter (and Getting Started With the STM32F1) : 7 Steps (with Pictures) - Instructables
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