I think the number of people who can clear all is low because this app is extremely hard!! Try playing a person other puzzle is too easy!!!
The rule is simple.
Only complete the equation by swiping the numbers and sign.
Degree of difficulty is 9 in total.
The number of questions is 90.
There is combinations of 7 to the power of 4 at the maximum.You are a genius if you can solve all the puzzles.