How to solve Sudoku

How to solve Sudoku

------------------------------------------------------------------------------------------------------------

sponsored link

Each difficulty level.

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.
How to solve Sudoku