It is a free app that you can enjoy training your calculation and mental arithmetic skills.

The problem is the popular fill-in-the-blank format,
Because you only need to select the calculation symbol
Anyone can enjoy it easily.

There are 1 to 5 levels
As the difficulty level gradually increases,
You can easily get your brain.

I need to answer within the time limit, so
It is also a training for reflexes and mental arithmetic.

Because you can feel free to do it during the gap time
It's also perfect for killing time!

[Recommended for people like this! ]
Those who like math and arithmetic
Those who are not good at calculations, mental arithmetic, and numbers
Those who like brain games
Those who like to get smarter, such as brains and pazuru
Those who want to train their brains while crushing
Those who want to train their brain for free
Those who want to increase the calculation speed
Those who want to do brain teasers easily