Flash mental calculation app to answer the total by adding the digits that are displayed one after the other on the screen.

[Training mode]
In the training mode you can play by changing the following settings.
- Digit number
· Display interval
- Number of questions

You can play anyone until the difficult problem from a simple problem.


[Challenge Mode]
You can challenge the rankings in four of the degree of difficulty in the challenge mode.
Aim the top ranking in the degree of difficulty that suits you!