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The diagonal constraint adds a new layer of complexity that keeps even expert solvers engaged.
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Paradoxically, the extra constraint can sometimes make puzzles easier to solve!
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X-Sudoku appears in world championships. Practice here to compete globally.
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rules How to Solve Hard Sudoku Puzzles Step by Step
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rules Tips for Improving Your Sudoku Speed
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rules Basic Sudoku Rules for Beginners
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rules Different Types of Sudoku Variants
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