I suppose if any Wii game were modded to control with a classic controller instead of whatever scheme they have (be it horizontal Wiimote or Wiimote + Nunchuk) like Donkey Kong Country Returns was, then when used as the base, they'd then be able to be played with the GamePad on the Wii U.
Who was it that patched DKCR's controls? Can we find them and ask them to do so for more great Wii games? Or is that way more difficult than one would think where each game would be a different scenario.
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I don't know if the gamepad has gyroscope capabilities, but I don't think the pro controller does, so motion controls are a problem. the switch pro controller has them, but I find them awkward.
The Gamepad does have gyroscope, pro controllers don't. I don't believe we can use gyro from the gamepad in VC Wii games though, I mean I'm sure it could be programmed in, but I believe that information is outside our grasp.
Motion controls need to be patched with the modded controls. Whoever patched DKCR, mapped shaking the wiimote to specific buttons, so it's certainly possible for some motion controls, but I'm sure others could be more problematic for remapping.