"Addition? Isn't it the learning for children?"
Don't you think so?
OK, how many stages can you clear?
Select the two numbers so that the total is equal to the target number in the upper left.
"Oh, this is very easy, isn't it?"
Perhaps, you can say so about only the first several stages.
Young people, play for the brain teaser as diversion.
Children, play for the improvement of calculation ability.
Grandmother and grandfather, play for the prevention of dementia.