Recently, Have you thought that the brain became hard?
This application rounds your hard brain.
For example, its assumed that the question of "1+3" is coming out and there are "4" and "8" in choices of the answer.
"4" is an answer,right?
But,Its not correct answer in this application.
In this case, please choose "8".
Next, its assumed that the question of "5+4" is coming out, and there are "3" and "9" in choices.
Then, is the answer "3"?
No, please choose "9" in this case.
If its coming out except question of answer 9,please select wrong answer.
Otherwise,You selects "9"(correct answer).
Im Sorry...
I cant speak English well...
Have a good time!