General

A gamebook is a book that allows the reader to participate in the story by making choices that affect the course of the narrative, which branches down various paths through the use of numbered paragraphs or pages.

At the end of a paragraph, the reader is usually presented with a choice of narrative branches that they may follow, with each option containing a reference to the number of the paragraph that should be read next if the option is chosen. The reader may eventually reach a concluding paragraph which will bring the narrative to an end. In most gamebooks only one (or if more than this, a distinct minority) of the concluding paragraphs will end the narrative with a "successful" ending, with the others ending the narrative with a "failure" ending.

Gamebooks are usually written in the second person with the reader assuming the role of a fictional character. The titles are usually published in series containing several books, although individual gamebooks have also been published. While the books in many series are stand-alone narratives, others continue the narrative from the previous books in the series.

There are three types of gamebooks. The first is the branching-plot novel (an example of this is the Choose Your Own Adventure series of gamebooks), which require the reader to make choices but are otherwise like a regular novel.
The second type is the role-playing game solitaire adventure (an example of this is the Tunnels and Trolls series of gamebooks), which combines the branching-plot novel with the rules of a role-playing game, allowing the game to be played without a Gamemaster but requiring the purchase of separate manuals.
The third type is the adventure gamebook (an example of this is the Fighting Fantasy series of gamebooks), which combines the branching-plot novel with simple role-playing rules included with each book.

(Information taken from Wikipedia)

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