すうどくん Sudokun(数独君)

"Sudoku-kun" is a game in which numbers from 1 to 9 are inserted where numbers are missing in 9 x 9 squares called sudoku (Nampre).
 Complete all available squares with the following simple rules.
      ・ Don't put the same number in row / column (put all the numbers from 1 to 9)
       ・ The area (3x3) must not contain the same number (enter all the numbers from 1 to 9)
  There are three levels of difficulty: Easy, Normal, and Hard. Which one do you want to challenge?
 It's a simple game but I'm passionate about it. Please enjoy it when you have time for a change or when you want to change your mind.