Product Description

For those who like to live dangerously and push beyond their mental comfort zone, steel yourself for The Times' toughest Killer collection yet. Prepare for the extreme mental challenge of 120 Deadly-level Killer puzzles, including, for the first time ever, 20 Extra Deadly, to really test your limits: thjs is the only place you'll find such a torturous collection in a single book. The Times Ultimate Killer Su Doku is not for the fainthearted. The puzzles use the same 9x9 grid as Su Doku, and have an added mathematical challenge. The aim is not only to complete every row, column and cube so that it contains the digits 1-9, it is also necessary to ensure that the outlined cubes add up to the same number as well. But unlike with previous books, there is no chance to ease yourself in with Easy, or even Tough puzzles: this book is the ultimate Killer Su Doku - completely deadly.

Product Details

• Amazon Sales Rank: #1183 in Books
• Published on: 2009-07-27
• Original language: English
• Number of items: 1
• Binding: Paperback
• 224 pages

Customer Reviews

Finally!
I am one of those that bought all the killer sudoku books I could find and went straight to the deadly and mindbending level puzzles. I have always battled thru my puzzles, and tend to restart a failed puzzle rather than check the back. I failed around 20% of the deadly puzzles first time around, and some the second! Finally, a book that stretches my limits. Dayyyyyys of fun. Not for the weak............

CHALLENGING!
For those who look forward to Friday and Saturday in the Times - for the deadly killers - you need wait no longer. Buy this book and you have problems of that difficulty every day.

Oversold!
It's a good set of puzzles certainly, but the product description oversells it.
The puzzles are not basically much harder than Book 5, which provides 30 extra puzzles for your money.
The new 'Extra Deadly' category consists of 20 puzzles with a par time of over 89 minutes. Book 5 has 21 puzzles over 89 minutes par, but they are just not called 'Extra Deadly'. I thought perhaps they had revised the par, but they seem to be about the same standard as Book 5 very hard puzzles.
So buy Book 5 before this book. Of course if there's an Ultimate 2 , I'll buy it!
but a Book 6 with 150 puzzles would be a higher priority.