Sudoku is one of the most popular mind skill fitness apps and is very good to keep your brain trained. This is a simply easy-to-use sudoku game, with fresh and cool interface, very acceptable difficult levels, suitable for sudoku beginner to sudoku expert. With 3 awesome skill levels, intuitive interface, and all the functions right at your super fingertips, this Sudoku game is sure to be your most favorite. Interrupted, boss calling, baby crying, cop watching you?(We won't tell, be safe though) Exit Sudoku:-), and the puzzle is saved exactly as you see it! Totally FREE!! 3 levels - easy, medium, hard Smooth interface and Impressive graphics Pencil marks as notes Auto-save Undo and Redo Hints to help you complete hard ones Selected digit highlighting Incorrect entry highlighting Game Rules: Sudoku is a logic-based number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids contains all of the digits from 1 to 9.