The goal of Sudoku is to fill in a 9×9 grid with digits so that each column, row, and 3×3 section contain the numbers between 1 to 9. At the beginning of the game, the 9×9 grid will have some of the squares filled in. Your job is to use logic to fill in the missing digits and complete the grid.

Game features:
1 Sudoku puzzles level is rich, simple, intermediate, difficult, expert four levels
2 Rich themes, night mode, regular mode, color mode arbitrarily
3 Auxiliary function is useful, auxiliary check error, duplicate item highlighting
4 Note function, uncertain digital note record
5 Prompt function, provide guidance when encountering difficulties
6 Statistical functions, challenge records, at a glance
 
As a digital puzzle game, Sudoku does not require you to have calculations and special math skills, only wisdom and focus.
Improve attention and intelligence!

Tip: There is only one answer for each Sudoku question!