Wii U can use two GameCube controller adapters
GameCube Controller Adapter For Wii PC and Nintendo Switch
Confirmed: The Wii U GameCube Controller Adapter will not work on DDR, Active Life, or Cyberbike | Gaming.Fit
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
GameCube Controller Adapter for Wii U, Nintendo Switch and PC USB by L
GameCube Controller Adapter for Wii U & PC USB for Windows, Wii U
Mayflash GameCube Controller Adapter for Wii U and PC USB (4 Port) - Walmart.com
Wii U Gamecube Controller Adapter - Brook Gaming
gamecube Controller Adapter (For Switch/WiiU/PC) – YCCTEAM
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4 Port Gamecube Controller Adapter Converter for Wii U & Switch [gcac037] - $19.99 : Zen Cart!, The Art of E-commerce
Gamecube Controller Adapter for Wii U - Solaris Japan
Nintendo Wii U & Switch GameCube Controller Adapter - OFFICIAL OEM | eBay
GameCube Controller Adapter for Wii U, PC USB, MAC & SWITCH - NEXiLUX - Walmart.com
Amazon.com: Gamecube Adapter for Nintendo Switch Gamecube Controller Adapter and WII U and PC, Super Smash Bros Gamecube Controller Adapter. Support Turbo and Vibration Features with 180cm Long Cable : Video Games
4 Ports GameCube Controller Adapter for Nintendo Wii U
Amazon.com: Mayflash GameCube Controller Adapter for Wii U, PC USB and Switch, 4 Port : Video Games
GameCube Controller Adapter only works with Super Smash Bros. Wii U | VG247
GameCube Controller Adapter for Wii U, Nintendo Switch and PC USB by L
Amazon.com: Super Smash Bros. GameCube Adapter for Wii U : Nintendo Gamecube Controller Adapter: Video Games
Wii U Gamecube Controller Adapter〔USA〕 Brook Gaming - Official Brook Gaming Store
Does the USB to gamecube adapter work in Wii mode on the Wii U? : r/wiiu
Wii U 4 Port Gamecube Controller Adapter
E-NET Gamecube Controller Adapter, 4 Ports for Gamecube Controller USB Adapter Converter for Wii U PC NGC & PC Game Accessory, Support Windows XP, Vista, for Windows 7/8, 32-bit and 64-bit Nintendo
TTX Tech GameCube Controller Adapter for Wii U and Switch - Micro Center
Amazon.com: Gamecube Controller Adapter for Switch/Switch OLED.Gamecube Adapter Compatible with PC Wii U.Adapter with 4 Ports 6 FT(1.8M) Cable Support Turbo and Vibration Features Super Smash Bros : Video Games
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GameCube Controller Adapter for Wii U + Nintendo Switch [Nintendo Accessory] | eBay
Gamecube Controller Adapter for Nintendo Switch | Hand Held Legend
