Mental arithmetic puzzles

Training a new sense of mental arithmetic puzzle game made by a professional engineer.
The screen is simple, but it is no doubt that Hooked.

You can play freely with little free time.

Since communication does not occur at all in the game, security is also safe.

[Explanation]
You can do sums mentally and enjoy yourself like a puzzle.
Just touch the arrow.
This simple game chooses the thing of the maximum [ sum total / of the number of the direction which an arrow points out ].
It is clearable by applying a correct answer into the time limit on each stage.
It will be failing if selection which was wrong or timed out.

Application because it is low volume, does not consume very little memory of the terminal.
There is almost no battery drain for simple graphics.

Since communication does not occur at all in the game, you can play even at locations out of reach of radio waves.
Because communication is not performed, without any risk of leakage, such as personal information, security is also safe.