: This format is native to Cemu (version 1.27 and newer) and does not work on original Wii U hardware. WUA vs. Other Wii U Formats Cemu Emulator Cemu - Wii U Emulator.
The Wii U had a messy update system. A base game, version 1.1 update, and DLC were often three separate entities. WUA allows "repacking" these into one container. When you download a , you literally drag one file into Cemu and click play. wii u wua roms archive