Exercise your brain by memorizing numbers and calculating!

How to play
1. Some colored circles with numbers are shown.
2. Memorize the numbers.
3. After the numbers vanish, follow the indication to calculate with the memorized numbers.

Play once a day and you can improve your short-term memory and concentration. In addition, with memorizing and calculating with memorized numbers, you can train your “working memory.” Working memory is a very important part of brain. Weak working memory is said to be linked to ADHD or ADD. And high performance of working memory will improve your multi task ability.