What do they do in this game? Do you think the game is an accurate version of what happens in the Radley home?
This is a good question. In the early chapters of the book, Jem, Scout, and Dill are fascinated with Boo Radley. They have heard things and they want to learn more. At one point, they even want to get Boo out of the house. The children are very preoccupied. During the summers, they make "game," which is essentially a drama. They try to reenact what happened at the Radley house from what they heard. Here is what Scout says:
It was a melancholy little drama, woven from bits and scraps of gossip and neighborhood legend: Mrs. Radley had been beautiful until she married Mr. Radley and lost all her money. She also lost most of her teeth, her hair, and her right forefinger (Dill’s contribution. Boo bit it off one night when he couldn’t find any cats and squirrels to eat.); she sat in the livingroom and cried most of the time, while Boo slowly whittled away all the furniture in the house.
The climax of the drama was when Boo stabbed his father in the thigh with scissors. Jem, of course, played this role, as he was the oldest. Scout says that it all looked real.
We can say that kids are just being kids. Now as for accuracy - probably none of these things happened. All of it was rooted in rumors or the imagination of children.