I own Coloring Books. Is Color by Number included?

No. Color by Number is its own studio, and Coloring Books does not include it (nor the reverse). It uses the same drawing engine as Coloring Books, but numbers, color keys, mystery mosaics, color by code, photos by number, pencil sets and answer keys belong to Color by Number. In a Coloring Books book, the "Color by number" card says "Unlock Color by Number in Activity Studio to use it ($97, one time)." If you own both, it shows "Make this a color by number book" instead, which turns that book into a Color by Number book.