Suitable for ages 7-12. The user will figure out the number the app has generated. There are 3 levels, each with its own 3 sub-levels, each with 6 sets of clues to complete a picture. Some of the areas covered are Tens & Units, Greater & Less than, Odd & Even, Decimals, Counting on/back, Add/Subtract/Multiply, Square Numbers, Rounding. The app includes an interactive 100-square, help with clues, and an option to view the answer if all clues are used.