This game had a lot of thought put into it. It has an experimentation area and three types of games. Each game is different but the number principles and number “physics” are consistent between all games. This game was a hit with the preschoolers and kindergarteners in my class and engaged their attention longer than just about any app I have seen them work with. It is more expensive than most apps, yes, but it is well worth the money. I cannot think of a better way to spend $8 on a math lesson. This app has many levels of play and many puzzles for each level. On their puzzle game I counted 30 categories with 9 puzzles each for a total of 270 puzzles. The way the designers have set this game up to teach number concept is very effective. The way the numbers/quantities are built and added upon and how they can also be sliced into smaller numbers/quantities, is pure genius! This app is an excellent tool to learn number concept-one of the best out there. I can say enough about how well this app can teach and reinforce number concept and numerals. This app is a must have for teaching experiential math concepts.