n-back

Good brain trainer app to improve your working memory with N-Back Task.

＜ USAGE ＞
1. Select level (1-10).
2. Memorize the answer of easy addition for the level times.
3. Continue memorizing and tap the last digit of the answer of n times before (NOT current answer).

You can submit your score to Google Play Game

If you don't know what is N-Back Task, please see below.
http://en.wikipedia.org/wiki/N-back