It is an application that allows you to test and train mental arithmetic.
Whether you are confident in your memorization ability or not, please try it out with this app.
You can test your memorization ability with people from all over the world anytime, anywhere.
You can also customize the speed and number of digits, so you can train at the level that suits you.
Please try the world ranking when you get the ability.
Rankings are also divided into levels according to ability.
You may be able to aim for the top ranking in daily training.
Please use it to prevent blurring, kill time, develop the right brain, and brag about it! !!