This app is an amazing way to teach algebra. My 7 and 8 year old granddaughters were competing to see who could complete each level first. They were almost tied, and the older is a math wiz and the younger has developmental challenges and struggles with basic math. This format is so logical and intuitive, that neither had any issues with it. It makes perfect sense out of an abstract concept. Growing pet monsters gives the motivation to keep trying. I enjoy playing it as well. Thank you!