flash 100フラッシュ100 
Categoly：Game For mental exercises, do this easy "add", "negative", "multiplication", and "division"! ■Time Attack mode
［20］…The time you took and the number of correct answers out of 20 questions will be clocked up. ■Mental Calculation mode
The math formula will be disappeared after a certain period of time. 

Time Attack & Mental Calculation

Cipher quickly!

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