Dig Stones

Dig Stones are large dark grey stones with a huge, white X painted on them. The first time you spot one starts a brief cutscene telling you to talk to Grandpa to find out more. There are several scattered all over the Valley. Digging them up will reward you with various items such as Furniture, Treehouse items, Cooking and Crafting recipes, Clothing items, and more.

You will need the Shovel/Spade to interact with them.