C-stick, activate: Wii U to receive GameCube controller adapter | Ars Technica
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GameCube Controller Adapter only works with Super Smash Bros. Wii U | VG247
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Wii U's GameCube controller will support more than just Smash Bros. [updated] | VentureBeat
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White Wii U GameCube Controller Adapter Spotted - News - Nintendo World Report
SEALDE Official GameCube Controller Adapter Switch Wii U Super Smash Bros + Gift | eBay
GameCube Controller Adapter For Wii PC and Nintendo Switch
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