I have to tap some of the areas several times before they will take the color. Also, it would be really helpful if, when one color is completed it would automatically jump to the next color. Then I would know the previous color was used up and i'd stop looking for pieces of that color. If the numbers on the areas were a little bolder, it would be easier for older people to see them. These are all features that other coloring apps use, and it makes it more fun to do.