This is subtitled Appearing The categories in the book are under general headings of counting, addition, subtraction, division, letters and words, money, reasoning, time telling, rhymes and differentiation. The games are all mixed so that other than the Table of Contents there is no division- thus taxing the ingenuity from page to page as to the kind of problem to be solved. Games include incomplete number series, mixed up picture sequences, the arrangement of object categories and so forth. There is a lot of type repetition but in reasonable amounts. A good book to play with. Paper.