Sudoku Genius
by Tom Sheldon
ISBN 13: 9780340921340
Format: Paperback (288 pages) Publisher: Hodder Paperbacks Published: 21 Nov 2005
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Sudoku Master Class: 144 Devilish Puzzles with Advanced Strategies
ISBN 13: 9780452287976
Format: Paperback (256 pages) Publisher: Plume Books Published: 07 Sep 2006