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Switch's 4.0.0 update now allows for GameCube controller support with Wii U GameCube Adapter
Here’s something very neat about Switch’s new firmware update. If you’ve installed the new 4.0.0 update, you can get GameCube controllers to work with the console. You just need the Wii U GameCube Adapter that Nintendo sold back in the day. Once you’ve plugged the adapter in, you can pair the GameCube controllers to your Switch in the main menu....
Brian