I found something interesting out the other day. If you have your switch on a dns to browse (I think fiddler also works) when you try to play the global testfire, it will bring up the browser but what makes this interesting to me is that all of the other methods I know of do not allow you to go home and return to the same page and also run off of a game. You also stay logged in on anything you have logged into when you turn it off or go home. I assume that the browser has some form of ties to splatoon while in use as the splatoon music continues to play while you are on it. If you have removed the demo it was possible for me to go to my account on the eshop and redownload it from my account options as of yesterday.