UP10 (Play & Learn! Series)
This is a game app in which you add up numbers horizontally or vertically to equal 10 to make them disappear. The puzzles grow from the bottom, and when they extend past the striped area the game is over.
There are hidden problems in the app. You can try them if you complete some condition.
Enjoy mental calisthenics with this app by competing with your friends or family members in the ranking or by simply working to increase your own score.