软件介绍：

心算：★Let's play the mental arithmetic game!★

★1. Introduction
- You can improve your ability in mental arithmetic by playing this game.
- There are nine different levels prepared for you.

★2. How to play
Calculate the two numbers that spring up from below.
Mathematical symbols will appear on the top of the screen.
You should choose one of the answers from the bottom.
Each time you tab on an answer, sound effects will let you know if it is correct or incorrect.
Each time you choose the wrong answer, you will lose a heart.
If you have no hearts left, you lose the game.
Hearts get recovered at the end of each levels.

★3. Specifics
- Easy to play
- Compatible with retina display