>4 year old sister who can't read english yet
>100% Mario Kart DS, including 3 stars in every single course and event
>even have Porygon-Z's Gen 4 sprite as my car logo
>allow her to play it because she finds it fun
>one week later I open the DS because it was still on
>Save file deleted, everything back to 0
>winnie the pooh the family dog
>It hurts, but I suck it up and I start playing to 100% it again
>Still allow her to play, she obviously reached the hidden inside the Settings Delete Data option by accident so is no biggie
>A couple days later, she managed to delete the save data again