Enigmascientific Publishing

ebooks (also available in print form) 
Sample: World of Sudoku by John Austin Now published on Amazon. Now published in print form. 
World of sudoku by John Austin 
Sudoku and its variants have become an increasing form of entertainment in recent years for a large number of people. The puzzles can in principle be solved by brute force trialanderror methods, but this would be time consuming and impractical. This book is a stepbystep guide to a strategy that enables Sudoku and related puzzles to be solved rapidly and efficiently. 
Obtain print book from CompletelyNovel.com 
The book contains 15 Chapters with almost 200 individual diagrams. Part 1 is devoted to Sudoku itself, and in 8 Chapters it describes the solution method, increasing in complexity from solving the very simple elements and progressing to elements which are linked 5 or more along a row, column or 3x3 square. Part 2 describes Sudoku related puzzles such as Samurai Sudoku and Idoku. Later, the book describes Kakuro and the challenging Killer Sudoku, again providing stepbystep instructions. In Chapter 14, some mathematical background is given and a Sudoku with the minimum number of clues is presented along with its solution. Readers interested in more of these minimal sudoku puzzles to solve can obtain Sudoku Seventeen. 