If you're a beginner at photoreading and only using the book you'll need to understand that the dictionary game is just a game. It's played in the early part of the course to give us some insight what we can do. Not everyone has success with the game at the early point. To explain the details would be quite lenghty and thats probably why its not in the book. It takes up a complete side of the tape and there are preparations you need to do before you attempt to photoread the dictionary. It boils down to photoreading the dictionary then letting words pop into our head and then guessing the position of the word within the dictionary. Without the guidance to prepare you it is not much of a game.
When you are learning from the book you need to learn all the steps before one could recommend the dictionary game. Once you've tried all the steps and actually done the 5 day test to prove to yourself that the photoreading system works for you, then the dictionary game becomes kind of redundant. You can then photoread the dictionary for a different purpose.
Alex