No papers! No pencils! Play free online sudoku puzzles to train your brain and build your memory with logic at Happy Sudoku - designed for both beginners and advanced players with various features: classic sudoku, sudoku free, brain sudoku puzzles, the daily sudoku online, sudoku challenge, sudoku tips, sudoku mega and more. Hush the nagging thoughts and learn how to play sudoku now!
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Pencil mode and Notes: It will certainly help you deduce the right answer and learn how to solve sudoku more effectively. Turn the mode on or off as you wish. Moreover, in case you still miss the feeling of taking notes on paper, Happy sudoku has specifically designed the feature of Notes for you! Each time you fill in a cell and complete a row or a column, notes will be automatically erased.
Dark Mode: Sharpening your brain is vital. So too it is to protect your eyes.
Auto-Check: Numbers maniac, puzzle fiend or even Sudoku junkie wouldnt know theyve made mistakes. Just turn the mode on and Happy Sudoku will point you where and show you how to do sudoku.
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Highlight Duplicates: Avoid repeating numbers in a row, column and block.
Statistics: Show you what youve accomplished, track your progress and youll get to know sudoku rules and sudoku techniques, sudoku answers and more. Complete your daily sudoku challenge to drill your self-confidence and self-reliance with thousands of free sudoku puzzles, sudoku free, sudoku strategy, sudokus, extreme sudoku, jigsaw sudoku and more.
What is sudoku? Its actually number placement puzzle appearing in newspapers, such as usa today sudoku, la times sudoku, washington post sudoku, usa sudoku, etc. It is made up of a nine-by-nine grid (sudoku 9x9), and is to fill the layout with the digits from 1 through 9, within which every row, every column, and every three-by-three box contains these blank sudoku digits without repeating.
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