Sudoku-Master edition

Details

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. On;y logical ability needed, regardless of math calculation. It is easy to play, a good way to excerice your brain due to the variety of the digital arrangement.