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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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xmas sudoku Sudoku is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 subgrids contain all of the digits from 1 to 9. detroit news sudoku There are several difficulty levels in Sudoku, ranging from easy for beginners to expert for seasoned players. Solving techniques include scanning, cross-hatching, and identifying candidate numbers. squiggle sudoku Sudoku competitions are held globally, where speed solvers compete to finish complex grids in the shortest time possible.

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