47349617
9781540829696
Katsumi is the author of 'Sudoku 1,000 Puzzles 500 Medium & 500 Hard With Solutions: Take Your Playing To The Next Level With This Sudoku Puzzle Book Containing Two Levels of Difficulty (Rising Sun Series) (Volume 25)', published 2016 under ISBN 9781540829696 and ISBN 1540829693.
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