Nintendo; way to onboard:
First, choose "region" - being in the United States "region," you get to scroll all the way down to "U" instead of having the store detect ANYTHING by the region set by the store. Why not start with that?
Second, "link Nintendo account" drops you on a page with two choices: "Create Nintendo account" or "Create Nintendo Account for a child" What if you already have one? What if you just want to sign in? Well, actually, that's under Create. For some reason.
The game itself is alright. It's slow-paced and seems like replaying even early levels for completion could be fun. But, sheesh, Nintendo really exists in its own little bubble, and still doesn't seem to understand basic stuff like this for apps.