Brain training counting

This is brain training app by counting balls.

You can select three level(easy normal hard).

When pushing each level button, game starts.

You count balls as quickly as possible and enter the number from right hand side buttons. If It is right, you go next round. If it is wrong, you get penalty time for total score. After 8 rounds, you can see the result.

If your total score exceeds some level, you are ranked ..SI,SJ,S,A,B,C.. and so on. Let's aim for higher rank.