I just got my system back from repairs, and I checked my activity log. Here's what was entered:

Day 1: system settings (0:01)
Day 2: ????????? (0:02)
?????????(0:02)
NINTENDO DS Demonstration (0:01)

The demonstration was also added to my software library. What do you think they could be?

Make it your favorite title lol.

It is probably tools that nintendo use to check up the 3DS after repairs, or even repair it with

But yes, you should have it as your fav title!

Do you have access to any software you didn't have before?

Make it your favorite title.

hahaha that'd be epic. I'll try it.

This exact application appeared in my activity log after sending my 3DS into Nintendo to be repaired (Mine was played for two minutes though).

Unfortunately, it isn't possible to set it as a favorite title (when you click "change favorite title", it doesn't appear on the list), making me think that it's actually a DS game of some sort (DS games also can't be set as favorite titles).

Yeah, just tried with the same result. Interesting though. can't find info on it anywhere.

OMG i got the ??????? as well! i wonder what it is!! and why its a secret!!

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PM ME UR FC AND I WILL ADD U!!!!!!

Mine had all those activity logs mentioned, but even more cool a streetpass hit from a Nintendo employee!