GGF's Diary, an abbreviation for Great-Grandfather's Diary, is an item in EarthBound Beginnings. It is the diary of George, Ninten's great-grandfather, which can be obtained from a Gift box in the basement of Ninten's House after unlocking the door. In front of the "XX" shell within the cave that leads to the mysterious Magicant, the book can be used to answer a strange riddle.
- "Who has lost his tail?"
- "The forgotten one of the ship that sails the cosmos."