If Extremely Difficult Sudoku Puzzles challenged you, then Expert Sudoku Puzzles will push your limits even further. Puzzles at this level are considered nearly impossible to solve without deep analysis and the use of the most advanced logical strategies.
Expert-level Sudoku requires not only a mastery of solving techniques but also patience, strategic thinking, and the ability to anticipate moves. Every decision is crucial, and a single mistake can make the entire grid unsolvable.
On this page, you’ll find 2,000 of the most played Expert Sudoku puzzles. Out of millions unique grids, these have been chosen by players seeking the toughest Sudoku challenges. Each puzzle demands maximum focus, precise analysis, and a deep understanding of advanced logical techniques. If you can solve these, you have truly reached a master level.
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Board number 800
575 times played
Board number 801
574 times played
Board number 802
824 times played
Board number 803
642 times played
Board number 804
608 times played
Board number 805
673 times played
Board number 806
637 times played
Board number 807
655 times played
Board number 808
630 times played
Board number 809
817 times played
Board number 810
609 times played
Board number 811
571 times played
Board number 813
583 times played
Board number 814
526 times played
Board number 815
788 times played
Board number 816
587 times played
Board number 817
642 times played
Board number 818
687 times played
Board number 819
641 times played
Board number 820
535 times played
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What Makes the Expert Level Stand Out?
• Puzzles at this level are often called “Impossible Sudoku” because most basic methods won’t be enough to solve them.
• The most complex elimination techniques and logical chains are essential.
• Designed for players who have mastered Sudoku and want to test themselves with the most challenging grids.
If you can solve Expert Sudoku, you belong to an elite group of players who have perfected the game.
How to Solve Expert Sudoku Puzzles?
At the Extremely Difficult Sudoku Puzzles level, standard elimination techniques are rarely effective, and solving the grid requires in-depth analysis of logical relationships between cells. While strategies from previous levels—such as Nishio, Almost Locked Sets, and Grouped X-Cycles—are still valuable, even more advanced techniques may be necessary to eliminate incorrect values in the most complex puzzles.
1. Using the “Chain Coloring” Method
The Chain Coloring technique helps eliminate incorrect candidates by tracking logical dependencies between connected cells. If two alternative values in a cell lead to a contradiction elsewhere in the chain, one must be correct, and the other must be eliminated. Follow these steps:
➡ Select a digit to analyze and find all the cells where it can appear.
➡ Assign two different “colors” to the two possible values and follow their logical relationships throughout the grid.
➡ If one color creates a scenario where the same number must appear twice in a row, column, or block, then that color is incorrect.
➡ Eliminate all candidates associated with the incorrect color and continue solving the puzzle.
Example:
If the number 7 can only appear in two locations in a column, and both are connected to other cells in a block, you can assign them different “colors” and analyze the consequences. If one color leads to a contradiction, then the other must be correct.
2. Applying the “2-String Kite” Method
The 2-String Kite technique is a variation of Skyscraper, allowing numbers to be eliminated when they are restricted to two possible positions in different rows or columns but share a common connecting point. Follow these steps:
➡ Identify two cells in different rows that contain the same number as a possible candidate.
➡ Check if these two cells are linked by a third cell in another column or row.
➡ If they are, eliminate that number from other locations in the shared row or column, helping to simplify the puzzle.
Example:
If 4 can only be placed in two locations in rows 3 and 7, and both are linked through a common column, then 4 can be eliminated from other cells in that column, making solving easier.
3. Using the “Kraken Fish” Method
Kraken Fish is one of the most advanced elimination techniques, allowing for simultaneous analysis of a digit’s possible placements across multiple rows and columns. This method helps uncover logical dependencies across the grid and eliminate incorrect values. Follow these steps:
➡ Identify a digit that can only appear in specific locations across multiple rows or columns.
➡ Analyze what happens if that digit is placed in each of those positions—does it force another number into a conflicting position?
➡ If placing the digit in any of the possible locations leads to an unsolvable situation, then it must be eliminated from certain cells.
Example:
If 9 can only be placed in specific cells in three different columns, but every possibility leads to a scenario where another number is forced into an invalid placement, then 9 must be eliminated from some of those cells, allowing for further progress in the puzzle.
At the Extremely Difficult Sudoku Puzzles level, multi-step logical analysis is essential for finding the correct values in complex grids. Techniques like Chain Coloring, 2-String Kite, and Kraken Fish help eliminate incorrect candidates, allowing for the resolution of even the most demanding puzzles.
Play Expert Sudoku and Compete for Top Rankings
Solving Expert Sudoku Puzzles is not just an incredible challenge—it’s also an opportunity to compete against the best players. If you want to test your skills against others, you can join ranked games and climb the leaderboards to prove yourself among the best Sudoku players.
Choose a puzzle and take on the most difficult level of Sudoku!
