What is RetroArch?
RetroArch is a multi-system frontend which allows you to run many different emulators and other programs ("cores") through a unified interface. There are currently 28 different systems supported on Wii U, along with RetroArch features such as Ozone. While far from complete, the Wii U port is constantly growing as features and cores are added.
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Source: https://gbatemp.net/threads/retroarch-wiiu-wip.447670/