To clear any confusion; GW doesn't currently work on 8.1 but they have confirmed they'll be supporting it along with 9.0-9.2
yeah he has a standard 3ds on 8.1, so it would work on that, i was just saying it doesn't work on the n3ds on any firmware currently, and it doesn't for on 9.4 on either console and most likely wont for a long time
so to clarify
4.x-9.2 is usable on a standard 3ds
8.1-9.2 is supposed to be supported for the n3ds in a "coming soon" update
and 9.3/9.4 will not work for either the 3ds or n3ds, and there is no info suggesting it will be at any point