ParabolaX is an educational math game designed to help you learn about quadratic equations. There is a study mode to help you understand how the product of two linear lines forms a parabola. Once you have understood this there are three fun mini-games that help reinforce the concepts.
One of the games uses gestures as input, so you need to wave the device to guess the orientation of the parabola. The other two games use the touch screen to enable you to draw an approximate solution to the presented problem.