Wii U can use two GameCube controller adapters
Nintendo Support: How to Use Nintendo GameCube Controllers
New MAYFLASH 2 Ports Wii U GC GameCube Controller Adapter for Wii U & To PC USB | eBay
How to: Use a Gamecube Controller for the Wii U! - YouTube
![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
Amazon.com: Mayflash GameCube Controller Adapter for Wii U, PC USB and Switch, 4 Port : Video Games
Wii U GameCube Adapter - iFixit
How to Connect a GameCube Controller to the Wii - Howchoo
nintendo wii - Using GameCube discs on wii (controller) - Arqade
How to SYNC up GameCube controllers on the Nintendo Switch - YouTube
raphnet. - N64 controller to Wii/Gamecube adapter (v2)
C-stick, activate: Wii U to receive GameCube controller adapter | Ars Technica
How to Use a Gamecube Controller on a Wii: 5 Steps (with Pictures)
Tutorial: How to use your GameCube Controller Adapter for Wii U on the vWii - YouTube
How to Connect a GameCube Controller to the Wii - Howchoo
How to Use a Gamecube Controller on a Wii: 5 Steps (with Pictures)
raphnet. - Gamecube controller to Wiimote adapter
GBros. Adapter | 8BitDo
raphnet. - Gamecube controller to Wiimote adapter
How to mod a Gamecube controller to connect to a Wiimote for Wii U and Wii - YouTube
TIL You can use gamecube controller in Mario Kart Wii : r/wii
Gamecube Controller to Wiimote : 8 Steps (with Pictures) - Instructables
Amazon.com: Mayflash GameCube Controller Adapter for Wii & Wii U (Dual Pack), White : Video Games
How to Connect a GameCube Controller to the Wii - Howchoo
