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Non-fiction - Books and manuals - 200 Puzzling Shamrocks
200 Puzzling Shamrocks
by Giulio Zambon

ISBN: 978-1-4709-7631-6
Publisher: Self-published with Lulu
Publication date: 2011-11-24. Pages: 137.
From 2011-11-24 on: Lulu for USD 9.99 in print

ISBN: 978-1-4660-2409-0
Publisher: Self-published with Smashwords
Publication date: 2011-11-24.
From 2011-11-24 on: Smashwords for USD 0.99 in several formats

Two hundred difficult to very difficult Sudokus that will try the limits of your abilities.

This book contains two hundred Sudokus that have their initial clues arranged in the shape of a Shamrock, but you will need more than luck to solve them, because they range from difficult to diabolical.

Shamrock Sudoku