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Portholic Gamecube Controller Adapter with 4 Ports Compatible with Wii U, Nintendo Switch for Super Smash Bros Ultimate (No Drivers Needed) - Black - Newegg.com
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KoopaTV: Stupid Gaming Journalists Confirm Nintendo Switch's Lack of Physical Backwards Compatibility
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Amazon.com: Y Team Controller Adapter for Gamecube, Compatible with Nintendo Switch, Super Smash Bros Switch Gamecube Adapter for WII U/PC with 4 Port : Video Games
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Nintendo Switch 2 Backward Compatibility Functionality Is Allegedly Being Tested By Developers : r/nintendo
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