I will immediately give this game 5 stars if you make more target numbers. Instead of adding to 10 every time, can you make the goal to add to 15 or 7 or 12....? I would pay $10 for this game if it had target numbers that went up to 20. And I'd pay $40 if the game also used subtraction, multiplication and division! It would end the days of forcing/bribing my child to practice boring flash cards. You folks have a great START here...the game is ADDicting (haha), fun, visually attractive, great music, clear instructions, and motivating. Give this app its full potential by adding the additional challenges I described and you will have an app that teachers and parents (and kids) will flock to (and pay for!) Go for it! I'll be eagerly waiting!