You can always enjoy the popular brain training puzzle game "Sudoku".
There are four levels of difficulty from level 1 to level 4, and there are 1000 stages for each level, and the questions are randomly asked.
・ Automatic check of newly entered numbers
・ Duplicate number highlight function
・ Highlighting function of duplicate numbers for columns, rows and blocks
・ If you get stuck, you can see tips.
Let's train your brain during a short break.
