Every page contains two pictures that seem to be identical, but in fact, contain a number of discrepancies (between 8 and 12).
The number of discrepancies between the two pictures on each page is indicated at the top of the page.
Find the discrepancies, and circle each one on the upper picture of each page.
After having found all the discrepancies, you can color the pictures.
The solutions can be found at the back pages of the booklet.