Ultimate Sudoku is a HTML5 Game. Enjoy this classic
Sudoku game with 3 different difficulty level: easy, medium
and hard! Train your brain with Ultimate Sudoku! Your goal
in this challenging logic puzzle is to fill a grid with
numbers so that each row, column, and section contains all
the digits between 1 and 9. Play in easy, medium or hard
mode, and use hints and other tools if you get stuck. Can
you solve this fun math game and fill out the entire grid?