You can practice seven questions on this page for The Xy chain theory.

How to solve Sudoku

The room of sudoku hard.

• Today's seven(level 2,3,4,5)

  For Medium(Each day seven sudoku)

• Today's hard(level 6-8)

  For expert(Each day hard one)

• Today's hard +

  For expert(Each day hard+ one)

• level6(2020/9/30 up)

  For expert

• level7(2020/9/30 up)

  For expert

• level8(2020/10/29 up)

  For great expert

• level9(2020/9/25 up)

  　　　

  For great expert

• Zero(2020/6/22 up)

  For great expert.The Sudoku that one number cannot write.

• animalsudoku(level_2,3,4,5)

  Sudoku to use the illustration in substitution for a number.(Each day seven sudoku)

• Today's level1

  Simple sudoku(Each day simple one)

• Today's level0

  For beginner(Each day simple 7)

• Exercises

• How to play

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