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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?