Fill each line of numbers from 9 to 1 in each line of the game.

At the beginning of the game, 9x9 will have some squares filled with numbers.What you have to do is use logic to fill in the missing numbers and complete the grid.
Software features:

1.There are four levels of Sudoku: classic play, daily challenge play and limited time leisure activity. Sudoku has rich topics, which are simple, intermediate, difficult and expert.

2.There are many ways to play, including classic play, daily challenge play and limited time leisure activities.

3.Auxiliary function is practical, auxiliary check error, and duplicate items are highlighted.

4.note taking function, uncertain digital note taking.

5.prompt function to provide guidance when encountering difficulties.

6.The challenge statistics and rankings are clear at a glance.