Sudoku - Classic Soduku Games

Classic Sudoku game, we provide various difficulty Sudoku, able to generate unlimited Sudoku boards, able to count player's errors, time, etc., provide functions such as rewind, delete, fill, hint, etc., with beautiful motivating dynamic effects.
Sudoku is a mathematical logic game consisting of 9 x 9 grids where players need to reason out the numbers of other grids based on the numbers provided by the grids. The game designer will provide a minimum of 17 numbers making only one answer to the puzzle.
This game only requires logical thinking skills and has nothing to do with number crunching, so it is also suitable for people who are not good at math. Although the game is simple to play, the numbers provided are so varied that many educators believe Sudoku is a good way to exercise the brain.
Rules:
The game generally consists of nine 3 x 3 nine-column squares.
The numbers in each column must contain 1 to 9, and cannot be missing or repeated.
Each palace (the area enclosed by a thick black line, usually 3 * 3 of the nine palaces) must contain 1 to 9 numbers, can not be missing, and can not be repeated.