Sudoku X Book 1: The Only Puzzle with the 'X' Factor
by Monckton, Christopher Christopher Monckton,
ISBN 13: 9780755315017
Format: paperback Publisher: Headline
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Sudoku X-mas
by Christopher Monckton
ISBN 13: 9780755315024
Format: Hardcover (192 pages) Publisher: Headline Published: 10 Oct 2005
Junior Sudoku X
ISBN 13: 9780755315284
Format: Paperback (160 pages) Publisher: Headline Published: 06 Mar 2006