Love this simple project you and the kids can do… and play!… together!
All it is, is paving stones and some rocks the kids can find and paint Os and Xs on. Store the markers in a secondhand bowl or two from the local thrift store, and you can leave the entire game out all summer long.
(I found the image on Pinterest, but can’t find the creator. If you are that person, let me know so I can credit you!)