Fans of Su Doku have an ever increasing desire for trickier puzzles and Killer Su Doku should satiate their appetites as it poses an even greater challenge than the Fiendish Su Doku puzzles. It takes the number placing puzzle to the next level by adding an element of arithmetic and one cannot rely on logic alone. The puzzles use the same 9x9 grid but there is a double test. The aim is not only to complete every row, column, and cube so that it contains the digits 1–9, the numbers within a second dotted-line grid have to add up to a specific total. Included are some Gentle and Moderate puzzles to serve as a warm-up but the emphasis is on the Tricky, Tough, and Deadly levels.

The Times: Holiday Su Doku 2: 200 Killer Su Doku Puzzles

Humor & Entertainment

Sudoku Syndication

Puzzles & Games

HarperCollins, UK

The most addictive puzzle craze since the first crosswords were published, the ninth installment of Times Su Doku feeds the desire of puzzlers for yet more challenges. This collection of the wordless puzzle will put readers' logic to the ultimate test, and improve mental agility, 20 Mild puzzles for beginners, 50 Difficult puzzles for the slightly brave, 50 Fiendish puzzles for the extra brave, and for those gluttons for punishment who like their puzzles Super fiendish, 30 challenges.

The Time Su Doku Book 9 (Times Sudoku)

A new collection of previously unpublished Fiendish Su Doku puzzles with the added bonus of 30 Super Fiendish puzzles. Perfect for the advanced solver in need of a constant supply of ultra-difficult puzzles. Guaranteed to provide hours of absorbing, brain-stretching entertainment.
The puzzles in this collection are of the highest quality and supplied by Sudoku Syndication, the Sudoku suppliers to The Times newspaper.
Since the first Su Doku puzzle appeared in The Times in November 2004, they have become a phenomenon, with over 5 million copies of The Times Su Doku books sold worldwide. You don't need to be a mathematical genius to solve these puzzles; it is simply a question of logic. Each puzzle has a unique solution - and there's no guesswork required.
The Times Su Doku remains the original, the best and the market leader.

The Times Fiendish Su Doku Book 3 (The Times Su Doku)

A collection of 200 previously unpublished Difficult Su Doku puzzles of the highest quality from the Su Doku suppliers to The Times newspaper. Perfect for the intermediate Su Doku solver in need of a constant supply of challenging puzzles, this book is guaranteed to provide hours of absorbing, brain-stretching entertainment.Since the first Su Doku puzzle appeared in The Times in November 2004, they have become a phenomenon, with over 5 million copies of The Times Su Doku books sold worldwide. You don't need to be a mathematical genius to solve these puzzles; it is simply a question of logic. Each puzzle has a unique solution - and there's no guesswork required.The Times Su Doku remains the original, the best and the market leader.

Times Difficult Su Doku Book 3

Xtimes Diff Su Doku 3 Whs

Harper Collins Promotion