The Book of General Ignorance round differs, in particular during the Christmas specials. During the course of the "B" Series special, Fry and Davies swapped places for "General Ignorance", with Fry attempting to answer questions ostensibly written by Davies to stump him. During "D"s Christmas Special, all the "GI" questions revolved around saints. "The Book of General Ignorance" contains a list of 230 questions, most of which previously appeared in episodes of "QI". Each question explains the correct answer, and usually attempts to show why people tend to make the wrong assumptions, or believe certain myths. Each book contains two forewords, one by Fry, the
Agatha Christie: And Then There Were None sections of gameplay are optional, and the player may ignore many of the side-quests. This divided progression adds another dimension to gameplay, as not only does the player have to be in the right place to find a clue or solve a puzzle, but must be there at the right time. For example, an empty room in one act could hold a vital clue in the next. "And Then There Were None" features a journal system to aid in the collection and piecing together of clues. The in-game journal records everything that the player needs to advance in the game,