Feb 24, 14 · A news site known as "Wii U Hax" has revealed that it has tested an exploit to access the Wii U hardware — through the Wii mode, at leastThe Wii U is not compatible with GameCube discs or accessories, although a homebrew application for Wii Mode exists that enables GameCube hardware and GameCube controller support A USB GameCube controller adapter with four ports was released exclusively for use with Super Smash Bros for Wii U and does not support any other Wii or Wii U gamesIt has a few limitations, but overall it is comparable to the Wii's Homebrew Channel The most common way to get Homebrew up and running, is to download HBL and any apps your want to the SD card, and then run the gx2sploit from the Wii U's browser This can be done through one of several exploit sites, or by selfhosting (see below)
Multicore Wii Homebrew Possible By Unlocking Wii U Cores News Nintendo World Report