Because the Wii U contains a stripped down Wii It Is capable of natively playing GameCube but due to a lack of controller, memory card and a different disc drive that was
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![Wii U's GameCube controller will support more than just Smash Bros. [updated] | VentureBeat](https://venturebeat.com/wp-content/uploads/2014/10/wii-u-gamecube-controller-adapter-setup.jpg?fit=400%2C296&strip=all "Wii U's GameCube controller will support more than just Smash Bros. [updated] | VentureBeat")
Wii U's GameCube controller will support more than just Smash Bros. [updated] | VentureBeat
How to Play GameCube Games on Your Nintendo Wii/WiiU - YouTube
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Amazon.com: Super Smash Bros. GameCube Adapter for Wii U : Nintendo Gamecube Controller Adapter: Video Games
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Wii U - Wikipedia
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