Ultimate Sudoku is a HTML5 Game. Enjoy this classic Sudoku game with 3 different difficulty level: easy, medium and hard! Fill in the blanks with numbers from 1 to 9, each row, column or 3x3 block must contain the number 1 through 9 exactly once. Use keyboard or number buttons to fill in the blanks. This is an online HTML5 game presented by rorgames.com, it's can be played in any Modern Browsers such as safari and chrome. You can play the game on mobile device.