"Be An Interplanetary Spy is a series of twelve interactive children's science fiction books designed by Byron Preiss Visual Publications and first published by Bantam Books from 1983 to 1985.
Aimed at younger readers, these books were published in paperback form only, with brightly coloured covers and were heavily illustrated in black and white throughout. Unlike other series of interactive novels such as Choose Your Own Adventure stories or Fighting Fantasy gamebooks, each Interplanetary Spy book is made up largely of illustrations in a style that mixes comic book-like line drawings with blocky, straight edge illustrations matching the graphical quality of video games from the time of publication. Rather than requiring readers to select from various actions and directions, or succeed in dice driven 'combat' to progress through the story, these novels mostly involve puzzle solving. Image-based challenges such as mazes, pattern matching and visualization problems are common throughout the series, with all stories being presented in second person point-of-view. By including blank spaces or boxes for writing, puzzles that required pages to be folded over and even a cutout model in one novel (The Star Crystal) the reader was actively encouraged to make changes to the books themselves. Because of this, it is almost impossible to find a copy today in mint condition."
Source: Wikipedia, "Be an Interplanetary Spy", available under the CC-BY-SA License.