Let's do subtraction

It is a game that chooses subtraction answer from three. There are 10 questions in all. You will be able to do somewhat difficult problems with all correct answers. After installation, you can play even if you are not connected to the net. You can enjoy the exhilaration of the correct answer with a production full of speed. Even if you make a mistake, you can check the correct answer with fruit. Even if you do not know the answer, you can check the number with apples over time. However, as time goes by, birds on the blackboard will flap over and all will fly out and time will come and move on to the next problem. There are three difficulty levels. "100 questions" mode added.