Let's solve the mystery of the University of Tokyo students. Let's solve the problem displayed at the top and tap the letters at the bottom. When all the characters are filled, it is automatically judged whether they match. If you make a mistake, tap the part of the answer you want to correct and you can correct the input. If you don't know, press the hint button in the upper right corner to display the hint. If you still don't know, tap the surrender button next to the hint button. Can you become the Great King of the East? We have a number of issues, from easy to difficult, and we add issues on a regular basis.