0+1 app for iPhone and iPad
It is a calculator game.
How to play?
In the game, you can see a list of number on a blue line, and the calculator panel in the below. when the game start, you just need to click the related number button as regularly, and complete the level target.
How to change level?
In the main menu, you can see the current level, you just need to click the level button to switch the level you like.