Killer Sudoku: 101 Puzzles
by D. J. Ape
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Book Summary Information
Author: D. J. ApeEdition: Paperback
Audio: English (Unknown); English (Original Language); English (Published)
Published: 2006-08-11
ISBN: 1579510353
Number of pages: 144
Publisher: Ronin Publishing
Book Reviews of Killer Sudoku: 101 Puzzles
Book Review: Quite a Challenge
Summary: 5 Stars
This is an aesthetically pleasing book for the Killer Sudoku "connaisseur". All of the puzzles are "Perfect" Killers; that is, each sum contains a minimum of two cells and each puzzle is symmetric about at least one axis. The puzzles range in difficulty from what I call "light medium" to extremely difficult. All puzzles require knowledge and use of the Rule of 45.
The book is small (5.5" x 5.5") with one puzzle per page. Puzzles are 3.5" x 3.5" which makes each cell large enough for making notes in it. The paper is smooth and thick, which allows for easy smudge-free erasing and no press-through ridges (for those of us who write hard). There is a 10-page introduction followed by 20 Easy puzzles, 20 Cool puzzles, 20 Thinker puzzles, 20 Brain puzzles, 21 IQ puzzles, and Solutions. At the end of each puzzle section are two Killer variants: an "X" variant in which the two diagonals must also contain the numbers 1-9 and a variant where some sum cages contain diagonally adjacent cells. There are also four unsolved puzzles used as examples in the introduction that you can solve as a bonus.
The introduction contains an extensive explanation of solving techniques that you'll need to know to solve the puzzles in this book. There is also a table of sums with only one solution for quick reference (though after solving enough of these puzzles you'll have most of these numbers memorized).
I have almost finished my first pass through the book. I enjoyed all the puzzles that I was able to solve and I'm determined to go back and solve the ones that are giving me trouble. As usual, the difficulty I had with each puzzle did not always match the section of the book that contained the puzzle. For example, I found #36 to be pretty tough even though it was in the Cool section. I have not yet managed to solve numbers 49, 53, 56, 59, 60, 65, 74, 75, 78, 81, 83-85, 93, and 95-101 so I would consider these to be the hardest in the book. It would be really useful if the Solutions section contained some hints on how to solve some of the harder puzzles (like showing a partially solved puzzle with an explanation of how to get to the next step).
Because of the complex and varied techniques that are used to solve these puzzles I would not recommend this book for beginners. Instead I would recommend Steve Arons' book "The Official Book of Killer Sudoku: 120 Puzzles from Lite to Truly Killer". I definitely recommend this book for intermediate and advanced Killer Sudoku solvers. Publisher, more please!
Summary of Killer Sudoku: 101 Puzzles
Introduced by The Times, the British publisher who pioneered the sudoku craze, the ?killer sudoku? poses a double challenge: the basic rules of sudoku still apply, but puzzles initially have no numbers showing. All that is known is the sum of the numbers inside irregular boxes, called cages, in which the classic 9 x 9 sudoku grid is subdivided. Killer Sudoku contains 101 of these brain-busters grouped into six levels of difficulty. The introduction explains the basic techniques needed to solve these new versions of the world's most popular number puzzle.
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