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Sujiken(TM) Puzzles: From Easy To Difficult Paperback – October 19, 2009

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Sujiken(TM) Puzzles: From Easy To Difficult + Sudoku on the Half Shell: 150 Addictive Sujiken® Puzzles + Triangular Sudoku: 150 TriDoku puzzles
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Product Details

  • Paperback: 114 pages
  • Publisher: CreateSpace Independent Publishing Platform (October 19, 2009)
  • Language: English
  • ISBN-10: 144953094X
  • ISBN-13: 978-1449530945
  • Product Dimensions: 8.9 x 5.9 x 0.4 inches
  • Shipping Weight: 8.3 ounces (View shipping rates and policies)
  • Average Customer Review: 4.0 out of 5 stars  See all reviews (1 customer review)
  • Amazon Best Sellers Rank: #1,321,217 in Books (See Top 100 in Books)

Editorial Reviews

About the Author

George Heineman grew up solving logic and mathematical puzzles. He turned this lifelong interest in solving challenging problems into a successful career as a professor of Computer Science. He has used Sudoku in class as an example for introductory computer programmers. Based on this experience, he developed Sujiken which adds an entertaining twist on the basic Sudoku concept.

More About the Author

George T. Heineman is an Associate Professor of Computer Science at WPI. His research interests are in Software Engineering. He co-edited the 2001 book "Component-Based Software Engineering: Putting the Pieces Together". He is nearly half-way towards his childhood goal of writing one million lines of code.

Aside from his professional pursuits, George is an avid puzzler. He invented Sujiken(R), a Sudoku variation played on a right-triangle arrangement of cells in which numbers cannot repeat in a horizontal row, vertical column or diagonal in any direction. See more at

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Most Helpful Customer Reviews

By rmac1117 on February 6, 2012
Format: Paperback Verified Purchase
Sujiken is a new variant of Sudoku which incorporates diagonal positioning as well as incomplete rows, columns, and sections which must be considered in number-placing. The experience of a Sujiken puzzle is quite different from doing a garden-variety Sudoku puzzle, though they're based on a similar idea.

This volume, and a companion "Sudoku on the Half Shell" both offer different Sujiken puzzles of varying difficulty (easy, intermediate, challenging, difficult, monster) from the creator/author. Both contain an Introduction with a step-by-step guide for completing an easy-level puzzle. These walk-throughs include typical solving strategies, but unlike an example I noticed on the [...] website, they only include separate diagrams accompanying SOME of the entries into the triangular grid so solvers could keep track. Would have liked a more uninterrupted flow of these diagrams, so as not to have to keep cross-referencing while following along. Listings of cell-fill values are given with many of the solutions in this book, which actually tell the answers if you want to peek, but set in a format to allow not having to look at the solved grid itself.

I would also have liked to see a walk-through for a higher-level puzzle, such as "Challenging" or "Monster", as all these puzzles, though similar on sight, can be quite different once started. Easy puzzles are "easy" enough; we need strategy for slaying the dragons.

This book also lists in its intro pages other Sujiken volumes: one for each difficulty level, as well as one for kids, but (as of February 2012) Amazon doesn't appear to have them, after I did a few searches, only these two.
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