When you choose to take a piece of literature and expand upon it, either through roleplaying, or through some form of fan fiction, there are a number of choices that you have to make. First and foremost is, will you stick to the logical and chronological timeline that was laid out in the book? If you choose to follow the chronology of the book you can either choose to replay something that was written, simply mirroring what is in the story, or you can fill in gaps that the story doesn’t cover, such as time periods which were glossed over, or events which were not described in great detail.