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Non-fiction - Books and manuals - 100 Difficult CalcuDoku Puzzles
100 Difficult CalcuDoku Puzzles
by Giulio Zambon

ISBN: 978-1495948763
Publisher: MatheMagics Asia
Published in: 2014. Pages: 164.
Available in print from the publisher and from Amazon.

100 9x9 puzzles suitable for experienced solvers. If you want to tackle even more challenging CalcuDokus, you can find them in my three books 100 Challenging CalcuDokus, 100 Double CalcuDokus, and 50 Samurai CalcuDokus.