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o solve the puzzle, each row, column and 3x3 box must contain the numbers 1 to 9.
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o solve the puzzle, each row, column and 3x3 box must contain the numbers 1 to 9.
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Mathematical Snacks: A Collection of Interesting Ideas to Fill Those Spare Moments
byJon MillingtonEbook
Five-Minute Brain Workout: Games and Puzzles to Keep Your Mind Sharp and Supple
byKim Chamberlain