If the game card is dirty, you should clean it with the exclusive tool of Nintendo neatly.
If the game card cannot be read yet, you will have to ask Nintendo for repair.
This place isn't community of Miitopia, but community of Smile BASIC.
If data of Miitopia have disappeared from your 3DS, I think that you should download it again.
Let's question in community of Miitopia, if you are saying about the contents of the game!
This place isn't community of Miitopia, but community of Smile BASIC.
Who are they?
If data of Miitopia have disappeared from your 3DS, I think that you should download it again.