Nintendo Support: How to Use Nintendo GameCube Controllers
Gamecube Controller Adapter for Wii U - Solaris Japan
Hands On: Wii U GameCube Controller Adapter | Nintendo Life
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GameCube Controller Adapter for Wii & Wii U (Dual Pack), White
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GameCube Controller Adapter for Wii & Wii U (Dual Pack), White
Wii U's GameCube controller will support more than just Smash Bros. [updated] | VentureBeat
Amazon.com: GameCube Controller Adapter : Video Games
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Confirmed: The Wii U GameCube Controller Adapter will not work on DDR, Active Life, or Cyberbike | Gaming.Fit
Mayflash Nintendo GameCube Controller Adapter for Wii/Wii U PS3 Video Games - Newegg.com
Controller Adapter for Wii U with White GameCube Controller (Play-Asia.com Bundle) for Wii U