Sudoku Skill +++

This is an application that can significantly improve your Sudoku skills. As long as you work hard to practice Sudoku of various difficulties, your Sudoku ability can continue to improve.

How to play?

SudokuSkill++ is a 9th house, each house is divided into 9 cells. In this 81 boxes, you are given known numbers and conditions to solve the problem, use logic and reasoning, and fill in the other spaces with numbers 1-9. Make sure that each number 1-9 appears only once in each row, column and house.