Mental arithmetic training application.
If you win 10 games in a row, you will go to the next level.
level1 : 200+100, 600+100, ...
level2 : 300+400, 600+200, ...
level3 : 300+205, 800+102, ...
level4 : 508+200, 303+500, ...
level5 : 405+104, 504+201, ...
level6 : 400+290, 200+650, ...
level7 : 250+400, 630+300, ...
level8 : 640+320, 140+830, ...
level9 : 813+170, 443+450, ...
level10 : 721+253, 535+314, ...
In Japan, 8-9 years old (3rd grade)