User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-4813670-20130221114300/@comment-4813670-20130221141730

PicantePants, no you couldn't. Even near a wii u, you could only play locally with the guy on wii U. So far, wii u players could NOT bring 3ds players in the same room on the internet. Now the adapter can. But you still need a wii u to do so. No idea if you need a copy of the game for the wii u though... Since it only talks about the adapter as a mean to play online on 3DS, doubting seems allowed as far as requiring having both versions of the game is concerned.