計算ナイン：脳トレ・早押し暗算ゲーム！計算ゲームで脳トレ習慣

Do you know your mental arithmetic power?
With this app, you can see your mental arithmetic power in time.

Compete for time with family and friends ...
Try to update the best time ...
A brain training / quick mental arithmetic game that you can play in as little as 5 seconds!

Quickly press to complete the formula and erase the numbers.
I'm thrilled at the approaching time limit!
Erase the numbers and feel refreshed! !!

A brain training / quick-press mental arithmetic game that is addictive to thrills and exhilaration!
Whether you can clear it or not, your brain will be activated.
Effective for preparatory exercises for the brain before studying or working!

◆ Recommended game at such times ◆
・ I want to eliminate calculation mistakes
・ I want to calculate addition, subtraction, multiplication, and division accurately.
・ I want to increase the calculation speed of multiplication tables, etc.
・ I want to speed up the rotation of my head by practicing quick pressing of calculations
・ I want to improve my concentration as a routine before studying
・ I want to do brain training in the gap time
・ I want to prevent dementia by practicing quick pressing of simple calculations

Let's start with a gap time, 1 minute mental arithmetic and brain training habit every day!
Let's check the rotation speed of today's head!