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What are hard sudoku puzzles ? Hard sudoku puzzles are reserved for experienced players who have perfectly mastered the basic solving techniques learned with easy and medium sudokus. To be completed, you will need to learn and use the advanced sudoku solving techniques. There are five : X-Wing, XY-Wing, simple colouring, swordfish and XYZ-Wing. Play hard Sudoku puzzles online for free. Test your logic and strategy with challenging grids designed for experienced Sudoku solvers. Play daily advanced web sudoku puzzles online on Sudoku .com. Expert sudoku level is suitable for professionals, who possess an excellent knowledge of game and are aware of all the tricks and techniques. 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.
