Decide Your Destiny was a series of children’s Doctor Who gamebooks published by Penguin Character Books from 2007 to 2010.
They were of the style commonly referred to as “Choose Your Own Adventure,” written in the second person and with branching narratives, with each page ending with two or more options with instructions to advise the reader as to which page to go to depending on their choice. For example: “To go right, go to page 56. To go left, go to page 77.”