Hard game for 5year olds

My son gets frustrated, its too hard for him, there should be an easy level. This is the only one of this group of games that he Doesnt play anymore. It could be great if the diferences were more obvios for him to start to develope this skill and practice . After all this games are for kindergarden -age Kids

Gaecol about My First Games: Find the Differences - Free Game for Kids and Toddlers - Kid and Toddler App, v1.0