Ding is a robot that plays puzzle games with your child, generating random integers from 1 to N and letting your child guess until they get it right. Evaluation is given according to the number of guesses to improve the child's math thinking ability. At the same time, the child can adjust the upper limit of the random number by inputting "adjust upper limit", which makes the game more interesting. by FengGoFuZhou @user1048029065783