Sudoku

Do you like Sudoku？It will bring you to total fresh feeling. Sudoku is a game develop intelligence,can exercise your logical ability. This Sudoku has 4 levels, just choose a proper one for yourself to start the amazing journey. The objective is to fill a 9x9 grid with digits so that each column, each row , and each of the 3x3 sub-grids that compose the gird contains of the digits from 1 to 9.No omission, no repeat. Ony logical ability needed, regardless of math calculation. It is easy to play, a...