400 and Gamebooks
James Clewett graphs one of his favourite books and explains the significance of 400.
The extra video about the weird bit of graph is at http://youtu.be/wYo0SOMlxuc
The book is The Warlock of Firetop Mountain, the first in the Fighting Fantasy series. The same principle applies to the likes of "Choose Your Own Adventure" books.
James Clewett tweets (occasionally) at https://twitter.com/_Itch_
More videos featuring James: http://www.youtube.com/playlist?list=PLeaKaAcimVK3tyCR6ugbA4Yx7eaP0MIoX