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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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Controller Adapter for GC, Super Smash Bros NGC Controller Adapter for Switch, Wii U and PC USB w/ 4 Port - Plug & Play, No Drivers Needed: Amazon.co.uk: PC & Video Games
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Gamecube Adapter for Nintendo Switch Gamecube Controller Adapter and WII U and PC, Super Smash Bros Gamecube Controller Adapter - AliExpress
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Gamecube NGC Controller Adapter - Compatible with Nintendo Switch, Wii U, PC - 4 Ports for Super Smash Bros - USB No Drivers Required: Amazon.co.uk: PC & Video Games
![Nyko Retro Controller Hub Plus - 4 Port GameCube Controller Adapter with Turbo and Home Button for Nintendo Switch : Amazon.co.uk: Electronics & Photo Nyko Retro Controller Hub Plus - 4 Port GameCube Controller Adapter with Turbo and Home Button for Nintendo Switch : Amazon.co.uk: Electronics & Photo](https://m.media-amazon.com/images/I/71zKSTzyWAL.jpg)
Nyko Retro Controller Hub Plus - 4 Port GameCube Controller Adapter with Turbo and Home Button for Nintendo Switch : Amazon.co.uk: Electronics & Photo
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