The Sonic the Hedgehog Adventure Gamebooks are a series of six books published in the UK between 1993 and 1996 by Penguin Books. The first four books were released under the Fantail imprint, and the last two under the Puffin imprint.
They are interactive gamebooks, with multiple divergent stories. This means that, instead of a continuous narrative from start to finish, each book consists of many short, numbered sections, out of chronological sequence. At the end of each paragraph, the reader is directed to another paragraph, depending on the reader's choices, the events that have taken place so far in the story, and luck (in the form of results of dice rolls).
At the beginning of the book, a profile page allows readers to choose Sonic's abilities by assigning numbers to certain traits (e.g. speed and strength), as well as keep track of any items collected during the story.
The books required means of keeping track of your statistics and inventory (for example paper to write on and a pencil and rubber to keep track of your numbers and items.) A crucial item for gameplay required is a 6-sided die to roll with.
Gameplay was done through a series of Vital Statistics such as Speed, Agility and Coolness. The reader is instructed to number these abilities from 2 (being worse) and 5 (being best). During reading there are moments which require rolls based on a set statistic, These moments have a "Difficulty Number" that ranges from 5-10.
You roll the die and add the die number to the number of the statistic asked for in the book. If the number in total is equal or higer than the Difficulty Number then you are sucsessful, any lower may have consequences like the loss of rings.
Sonic collect various items throughout the books, the most common is rings, in tradition to the video games, collecting of 100 rings results in a life and under defeat at loss of rings is a penalty of these lives but can start a part of the story you are on from a check-point.