Abstract: We exhibited our illumination work at Tokiwa fantasia in 2025. In the center of the work, the logo of Ube KOSEN and a
slot-machine were made by matrixLEDs and microcomputers. Through this exhibition, it was found that the matrixLED is a powerful
tool for developments of students' problem solving and logical thinking skills. In this paper, we report how to use the matrixLED and
and some kinds semiconductor.