Hi, There you can download APK games file "n-back" for Android free, apk file version is 1.1.2 to download to your android device just click this button. It's easy and warranty. We provide only original apk files. If any of materials on this site violates your rights
< 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