Method 2 - Nintendont forwarder (Boot directly into Nintendont where you can choose a game from a list)
1) Download these Nintendont files
(REMOVED, make your own Nintendont inject with the Wii VC inject script. I can't help since its considered copyright)
2) Extract all files to your SD card, including the install folder (Which contains the Nintendont forwarder)
3) On your Wii U, run CFW such as HaxchiFW or Mocha. Then run
WUP Installer GX2 to install
Nintendont Forwarder (To USB Storage or System Memory)
4) Launch Nintendont from your Wii U home menu. It will ask if you want to use the gamepad as a controller, choose yes.
If your TV is turned off or the HDMI isn't connected, it will also ask if you only want to display on the gamepad. It will reboot into vWii mode and launches Nintendont.
Note: You always need to enable CFW before launching Nintendont, else you'll get
Error Code 99-9999 and be forced to shutdown. Even if you exit a game, you still have to enable CFW again before launching Nintendont
Note: For some users, launching Nintendont may result in a
black screen. As of right now, there is no explanation to this phenomenon or how to fix it. If this is the case, you won't be able to use method 1 or 2 in this section. Use the "All in One" method instead in
Section III below as a workaround.