The website boasts a considerable collection of Wii U ROMs, including popular titles and various indie games. However, the availability of specific games may vary, and it's unclear how often the collection is updated.
While some "free" archives exist online, the safest and most reliable way to obtain .wua files is by creating them from your own legally owned backups. Option 1: Converting in Cemu (Recommended)
The only legal way to obtain a ROM is to from a game you physically own, using homebrew tools on a modded Wii U. Even then, sharing that dump is prohibited.
: Instead of managing thousands of files in complex folder structures (like the Loadiine/RPX format), WUA packs everything into one file. Compression
Most modern emulators, specifically , also support a "Loadiine" format (extracted folders) or the WUP format used by the original hardware. The Best Way to Get Wii U Games: Cemu & Beyond