What happens to game saves when you delete a Nintendo Network ID?

Solution 1:

According to Nintendo's website,

Deleting a Nintendo Network ID will also delete the following information associated to the account: Nintendo eShop activity and balance, Friend List, Miiverse activity, and registered e-mail address.

They expand on this further, saying:

The Nintendo eShop and all associated purchases will be deleted, and cannot be downloaded. This applies to purchases made with this Nintendo Network ID both on the Wii U and Nintendo 3DS.

Any remaining balance in the Nintendo eShop account will be deleted and cannot be recovered or refunded. This applies to funds added to this Nintendo Network ID both on the Wii U and Nintendo 3DS.

The Friends List associated to this Nintendo Network ID will be deleted.

Any posts and comments made on Miiverse will be deleted.