I don't know if there's such a thing as game invites for the 3DS, but if there is, I apologize to I think Grand Kirby. Someone was on MK7 and there was an orange circle glowing on my screen and said that some guy was waiting in the lobby.
I tried to get in, but I couldn't because I needed an update. Then, I get a notification saying that the update can be found in the shop. Then I spent ages looking for this shop and then ages after that, I figured out that I had to manually do a system update before it would even pop up as an app on the home screen.
After all that crap was taken care of, my friend was no longer online.
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http://img.imgcake.com/kcftabletpnget.png