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  • 9 X 9 sudoku

    Level 20 Hint 17

    Get a hint for Level 20 on Sudoku99. Play Sudoku online for free!

    Sudoku99 offers a great selection of Sudoku puzzles at various difficulty levels. Play online for free today!

    Each game has one correct answer and there are a total of 20 levels of games.


    Click on the sudoku steps below to start the game!


    Easy
    Level1 (36hint )
    Level2 (35hint )
    Level3 (34hint )
    Level4 (33hint )
    Level5 (32hint )
    Level6 (31hint )

    Medium
    Level7 (30hint )
    Level8 (29hint )

    Hard
    Level9 (28hint )
    Level10 (27hint )

    Expert
    Level11 (26hint )
    Level12 (25hint )

    Expert - Silver
    Level13 (24hint )
    Level14 (23hint )
    Level15 (22hint )
    Level16 (21hint )
    Level17 (20hint )

    Expert - Gold
    Level18 (19hint )
    Level19 (18hint )
    Level20 (17hint )

    Expert Gold Level 20 Sudoku 9x9 with 17 Hints


    Level 20 ( Expert - Gold : 17 hint )

      • Number : 
      • #590,583   
      •    Ranking today's  Ranking 1 : Germany 00:00:10
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      • 4
      • 2
      • 1
      • 9
      • 1
      • 5
      • 6
      • 9
      • 2
      • 8
    • 1
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    • select puzzle
      9 X 9 sudoku

      Easy
      1Level - 36hint
      2Level - 35hint
      3Level - 34hint
      4Level - 33hint
      5Level - 32hint
      6Level - 31hint

      Medium
      7Level - 30hint
      8Level - 29hint

      Hard
      9Level - 28hint
      10Level - 27hint

      Expert
      11Level - 26hint
      12Level - 25hint

      Expert - Silver
      13Level - 24hint
      14Level - 23hint
      15Level - 22hint
      16Level - 21hint
      17Level - 20hint

      Expert - Gold
      18Level - 19hint
      19Level - 18hint
      20Level - 17hint
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    Thank you to Gordon Royle and The University of Western Australia who collected sudoku with 17 initial values. More information about their work.
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    9 X 9 sudoku

    Can you solve the hardest Sudoku puzzle?



    Are you looking for the hardest Sudoku puzzle on the internet? Look no further than Expert Gold Level 20 Sudoku 9x9 with 17 hints on Sudoku99.

    Sudoku is a game of logic where players must fill a 9x9 grid with digits from 1-9 without repeating any digits in each row, column or 3x3 square. Expert Gold Level 20 Sudoku is the ultimate test for even the most skilled Sudoku players.

    This puzzle comes with 17 hints to help you solve the game. But using a hint will increase your final time, so use them wisely. The ultimate goal is to solve the puzzle with as few hints and as little time as possible.

    Playing Sudoku can help improve logical reasoning, critical thinking, and analytical skills. And Sudoku99 offers this ultimate Sudoku experience for free!

    Can you solve the hardest Sudoku puzzle on the internet? Challenge yourself with Expert Gold Level 20 Sudoku 9x9 with 17 hints on Sudoku99. Test your logical skills and have fun playing Sudoku.

    The 17-hint Sudoku puzzle is considered the hardest Sudoku puzzle because it has the fewest number of starting clues while still having a unique solution. The puzzle has exactly 17 clues, meaning there are only 17 numbers initially filled in the puzzle grid, and the player must use logic and deduction to fill in the rest of the grid.

    This makes the 17-hint Sudoku puzzle extremely challenging because there are so few clues to start with. The player must use advanced techniques such as X-wing, Swordfish, XY-wing, and XYZ-wing to solve the puzzle, which requires a high level of skill and patience.

    In fact, it has been proven that there is no Sudoku puzzle with fewer than 17 clues that has a unique solution. This was discovered by a group of mathematicians in 2012, who used a supercomputer to check all possible Sudoku grids with 16 or fewer clues and found that none of them had a unique solution. Therefore, the 17-hint Sudoku puzzle is considered the hardest possible Sudoku puzzle.

    9 X 9 sudoku

    Sudoku is considered a thinking brain game.

    It requires players to use their logical reasoning, problem-solving skills, and pattern recognition abilities to solve the puzzle. Sudoku puzzles can be challenging and require players to think critically and strategically to find the correct placement of digits in the grid.

    The game also provides mental benefits such as improving concentration, memory, and cognitive flexibility. As players continue to solve Sudoku puzzles, they may develop new strategies, improve their mental agility, and enhance their overall problem-solving abilities.

    Overall, Sudoku is a popular and fun brain game that challenges players to think outside the box and engage their minds in a stimulating and rewarding way.



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