Color by Numbers - Christmas - Free is a children's app where kids can colour in a range of festive scenes. By following the numbers, they can choose the correct colours from the palette and let each picture come to life. Some of the pages require children to complete simple sums, meaning that the app is educational as well as entertaining. Once a picture has been coloured, it can be saved so that kids can return to it later. The range of pictures can be expanded through in-app purchases.