Wii U's GameCube Controller Adapter works with all games supported by the Wii Classic Controller/Pro, Wii U Pro Controller
Wii U GamePad GameCube controller Classic Controller, joystick, super Smash Bros For Nintendo 3DS And Wii U, electronics, nintendo png | PNGWing
Donkey Kong Wired Fight Pad (Classic Controller Pro) for Wii U & Wii | The Gamesmen
Hori Luigi Classic Controller Wired Controller For Nintendo Wii/Wii U - Walmart.com
The SNES Classic & Wii Classic Pro controllers both work on Mario Maker 2 using the 8BitDo Gbros Adapter, both have ideal dpads and feel right at home : r/NintendoSwitch
Nintendo Wii Classic Controller (White) review: Nintendo Wii Classic Controller (White) - CNET
We Unboxed Our Wii U And Weighed The Controller - Siliconera