3DS carts are actually NAND flash, and if you don't play them for long enough the may lost all the data! https://www.nintendolife.com/news/2021/05/psa_yes_your

3DS carts are actually NAND flash, and if you don't play them for long enough the may lost all the data! https://www.nintendolife.com/news/2021/05/psa_yes_your_ds_and_3ds_cartridges_will_eventually_deteriorate_but_dont_panic https://www.nintendolife.com/news/2021/05/psa_yes_your_ds_an...