Mental arithmetic training application.
If you win 10 games in a row, you will go to the next level.
level1 : 205+208, 401+309, ...
level2 : 158+705, 546+404, ...
level3 : 454+238, 523+358, ...
level4 : 290+330, 370+560, ...
level5 : 331+273, 254+672, ...
level6 : 898+8, 397+6, ...
level7 : 386+19, 623+78, ...
level8 : 485+47, 279+34, ...
level9 : 626+269, 329+439, ...
level10 : 467+299, 264+238, ...
In Japan, 8-9 years old (3rd grade)