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4x4 Sudoku: A smaller version of the classic Sudoku, suitable for beginners or individuals with limited time. symbol sudokufree killer sudoku The numbers must be placed in such a way that no number is repeated in any row, column, or 3x3 subgrid. These puzzles typically have fewer clues than their easier counterparts, making them more challenging to solve. free killer sudokusudoku how to play With its grid of numbers and various strategies, Sudoku presents a challenging yet rewarding experience. free killer sudoku Look for Contradictions: After applying the empty rectangle strategy, check if any contradictions have emerged.
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