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 Lloyd Wright, and in particular his house "Fallingwater". "And Then There Were None" was shipped to North American stores on October 27, 2005. The Adventure Company announced on March 19, 2007, that the game would be ported to the Wii console, which would feature an ability to spin the Wii Remote to turn safe handles, and the ability to unearth clues by imitating a digging action. "And Then There Were None" has received widely varying reviews since its release. Metacritic's weighted average score for the game was 68 out of 100 on the PC and 50 out of 100 on