Each book is exactly 121 pages long. Each book contains various puzzles such as mazes and word searches. There is an inventory system where the player collects items used to solve the puzzles, and a scoring system where the player can judge how well they did on a scale at the end of the book. In books 1-5, 7 and 8, this is judged by multiplying the number of coins the player collected in the course of the adventure by ten, but in books 6, 9-12, the player is simply awarded a certain number of points for overcoming challenges (the coin scoring system was joined with the point system in book eleven). There are several endings in each book. There is one victorious ending, and unsuccessful (often lethal to the characters involved) endings which end saying Game Over.
The You Decide on the Adventure series, also referred to as the Choose Your Own Adventure books, are a series of four gamebooks published by Scholastic from 2001 to 2002. All four were written by Craig Wessel and were based on the Game Boy Advance and Game Boy Color games at the time.