Hey I know this is a late response but I just tried our loader on the Wii U and it won’t work with either hyrule warriors or LEGO Batman 3. Ones that I have tested were just dance 2015, star fox guard, and super Mario 3D world. (Btw they are all American games)
@K3Nv2 I got some cheapies at wallys, that are pretty good, already have lost a few expensive ones (one falls out and gone, can't find) while cutting grass so bought some cheap ones, and of course never lose these cheap ones. (Cheap meaning only $35, compared to air buds which I only have 1 of 2 now)