5652423
9781847530844
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20 Techniques for solving every Sudoku in under 10 minutes. ;Suitable for all skill levels, as it works its way from the basic techniques up to the most advanced. ;The author was in the UK National Final in both 2005 and 2006.Colloby, Mike is the author of 'Sudoku Toolkit', published 2007 under ISBN 9781847530844 and ISBN 1847530842.
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