Nintendo has clarified details on amiibo save data restrictions following the announcement of 11 new NFC models scheduled for release next year. According to Nintendo of Japan’s official amiibo website, which verified Toon Link, Sheik and Zelda would be compatible with Hyrule Warriors, the figures will only be able to store one game’s save data at a time due to limited space. Ultimately, this means that players will be able to save data from Super Smash Bros, but will have to erase their data to use with another game which writes to the model.
However, this does not restrict read-only data, so players will still be able to use amiibo models with Mario Kart 8 and Hyrule Warriors to unlock Mii racer suits or new weapons without affecting the model’s save data. Given that Super Smash Bros is the only title that will read and write to the models currently, there’s no nightmare-inducing losses of save data. But when Nintendo chooses to release newer titles which both read and write data, players will have to exercise caution when using the same amiibo models between games.
“If you want to write the data of other read and write compatible software, please erase the data in the “amiibo setting” of Wii U.”