What do they do in boo radley's game

They roleplay all of the myths that have been told about him and act as him.

Jem plays Boo, Dill plays Mr. Radley, and Scout plays Mrs. Radley. They polish it up over the summer into a little dramatic reenactment of all the gossip they've heard about Boo and his family, including a scene using Calpurnia's scissors as a prop.