According to the eShop version packaging, the filesize of the game is 2.1GB (17,300 blocks).
Edit: Translation~
Edit: Translation~
In case anybody needs it/finds it relevant, here is a translation:
To add to the information, this japanese pre-order card also states 2.1gb.
So for those who were worried, your default 4GB micro SD will be more than enough for the game.Here's a look at the card:
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