Looking for a book from my childhood. It would be from the 70s, probably '77 or later, and my recollection is it was a dystopian book about a war between humans and androids or cyborgs.
It was an oversized paperback book with black and white illustrations. I think it also had some kind of "code wheel" built into the cover to solve codes in the book.
I do not remember a title or an author.
The book was actually a puzzle book and wove the story and the puzzles together. I don't know if you had to complete the puzzles to follow the story. I remember one puzzle involved plotting points in 3D, and I could never figure out how they derived their answer.
It was probably a YA book, and since I was only 8 or 9 it was probably over my head which is why it didn't click with me at the time.
But now I've been googling furiously trying to find it but coming up empty.