In chapter one of To Kill a Mockingbird, Jem and Scout are introduced to Dill, the nephew of a neighbor who is staying in Maycomb for the summer. As kids will do, Jem, Scout, and Dill pass the time in their sleepy Alabama town in a multitude of ways. One of Dill's inventions is the game "Boo Radley." Boo, a reclusive neighbor who is never seen outside of his home, is a source of endless fascination for the children.
Like many misunderstood characters in small towns, much of what is "known" about Boo is known through rumors and passed-down stories. One such story is that Boo stabbed his father with scissors while scrapbooking and showed no remorse afterward. Jem, Scout, and Dill create the game "Boo Radley" as a means of acting out the various stories they have heard about Boo. They weave the stories into a narrative of sorts, trying to make sense of what they have heard and to fill in the gaps of the information they do not have.
This game will later take on an additional layer when the children dare each other to touch the Radleys' front door.