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Play hard level Sudoku online on Sudoku.com. Our daily difficult web sudoku puzzles are suitable for people, who possess an excellent knowledge of sudoku game and know how to build a proper strategy to get a right solution in short terms.
Naked and hidden singles are the easiest squares to solve. A naked single is when a number can only go in one possible cell. A hidden single is when there is only cell for a given candidate.
Extreme Sudoku is the most challenging version of the 9x9 grid puzzle game for the real puzzle masters! It's not just about following the basic rules - you've got to be a puzzle-solving expert and use advanced strategies to crack it.
Expert Sudoku is a game for experienced Sudoku players with a very high level of difficulty. This hardest Sudoku puzzle is characterized by the fact that only a few numbers are shown in the Sudoku square, which consists of 9 small squares, where the cells are located 3x3.
Advanced Sudoku strategies are used in the hardest levels of these puzzles and they can either help to reduce candidates or find the solution for a specific cell. Regardless, their application always demands high levels of concentration from the player as they work by deduction. 1. The X-Wing.
Our Hard level online sudoku puzzles: On SudokuLovers.com you Can play high-quality Hard level web Sudoku, The difficult Puzzles are daily curated and are forever free! We also have a Daily challenge so you can keep your mind sharp!
To solve an hard sudoku online, start by applying the basic techniques on the grid. Once all the opportunities are exhausted, you will then have to use one of the advanced techniques to unblock the situation : X-Wing. XY-Wing. Simple colouring.
Play the hardest unlimited free sudoku puzzles online. Choose one of five very difficult levels from Evil to Extreme for a real challenge. Each puzzle has a unique solution and can be solved with pure logic.
Play hard Sudoku Puzzles online for free. Hard level puzzles for experienced players. Play them and challenge yourself.
The Sudoku in Fig. 1 is partially solved using easy and medium difficulty solving techniques: singles, hidden singles and column/block intersections. Now, no more squares can be solved with these techniques; you are stuck.