The Colossal Book of Short Puzzles and Problems
by Martin Gardner,Dana Richards
ISBN 13: 9780393061147
Format: Illustrated (494 pages) Publisher: W. W. Norton & Company Published: 22 Nov 2005
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Absolutely Nasty Sudoku Level 4 (Absolutely Nasty® Series)
by Frank Longo
ISBN 13: 9781402743993
Format: spiral_bound Publisher: Puzzlewright
New York Post Extra Hot Su Doku: The Official Utterly Addictive Number-Placing Puzzle
by Wayne Gould
ISBN 13: 9780061373190
Format: Paperback (240 pages) Publisher: Collins Published: May 2007
Large Print Cryptograms
by Trip Payne, Shawn Kennedy
ISBN 13: 9781402713132
Format: Spiral-bound (288 pages) Publisher: Sterling Publishing (NY) Published: 28 May 2004