Prodigy is a web based math games in which the kids have to math questons at their grade level. Correct answers allows them to do things and initiate actions. The game has a free version but it is limited of course; so you have to pay a yearly subscription to unlock some of the cool features. It is great teaching tool that the kids find entertaing as they are playing a graphical intensive game while learning math. I get a weekly report on their educational progress such as how many questions they answer and the percentage of correct answers given. The App is well worth the money and I have seen a difference in their math skills.