"Game Over, Charles" was written and directed by showrunner I. Marlene King, which serves as King's second writing credit of the sixth season, and the fifth directed episode of the series.
As a regard to who 'A' is going to be, King said "We knew that Mona was the original "A," but we didn't know how long we were going to be able to go to sustain that story before we gave her up to the audience.