This article presents an education tool that offers junior learners, such as junior high school students. basic knowledge of machine learning through designed games or quizzes. Learners can study basic ideas of k-NN classification, linear regression, and k-means clustering when enjoying their game playing. The system can also run on a smartphone for the convenience of learners. With such a tool, learners are expected to gain a better understanding of fundamentals of AI and machine learning and increase their interests in future development of AI applications.