n-back游戲簡介
< 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 GameIf you don't know what is N-Back Task, please see below.http://en.wikipedia.org/wiki/N-back
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