< 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
九游玩家7lyuzdgu4sov 來(lái)自于 九游APP 2017-08-17 15:04
呼呼的,到底