59488705
9781698909066
David Karn is the author of 'David Karn Sudoku Variations - Easy to Medium Vol 2: 90 Large Print Puzzles - 9 Sudoku Variants: X, Hyper, Twins, Triathlon A+B, Marathon, Samurai, 12x12, 16x16 - 16-24 pt font size, 8.5x11" format', published 2019 under ISBN 9781698909066 and ISBN 1698909063.
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