Mental arithmetic training application.
If you win 10 games in a row, you will go to the next level.
level1 : 50x3, 90x4, ...
level2 : 71x2, 41x6, ...
level3 : 42x5, 62x8, ...
level4 : 23x4, 53x7, ...
level5 : 64x1, 34x9, ...
level6 : 35x5, 85x6, ...
level7 : 46x3, 96x5, ...
level8 : 87x2, 67x7, ...
level9 : 28x6, 78x8, ...
level10 : 59x4, 99x9, ...
In Japan, 8-9 years old (3rd grade)