53116010
9781729152072
Basford Holmes is the author of 'Сlassic 400 + Killer Hard – Very hard levels sudoku 12 x 12: Holmes presents a logical puzzle book with proven Sudoku. Hard – very hard level Sudoku ... can be printed (Killer classic Sudoku 12x12)', published 2018 under ISBN 9781729152072 and ISBN 1729152074.
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