This book contains 160 brand NEW, previously UNPUBLISHED Jigsaw Sudoku puzzles. Jigsaw (or irregularly shaped) Sudoku puzzles share the same rules with classic Sudoku. The only difference is that the nine nonets are, well, irregularly shaped. This makes the puzzles slightly harder than the original Sudoku and surely more entertaining, because every puzzle has a unique nonet design and therefore, they can never become boring. In this book there are 150 of these puzzles in 5 levels of difficulty. For the hardest of puzzles you must use "The Law of Leftovers" solving method, which is explained...

ZERO Killer puzzles are played on a standard 9x9 Sudoku frame, but they give you the least amount of starting clues. Unlike ordinary Killer Sudokus, only some cells are grouped in cages, with cage totals shown as usual. Some of the cells are left completely blank. This makes the puzzles even harder than your usual Killer Sudoku. There are 101 of these gems in this book, split into 4 levels of difficulty. The difficulty is only relative to other puzzles in this book. All puzzles are quite difficult and are intended only for the experienced Killer Sudoku aficionado. One puzzle per page is...

The word "Hitori" actually means "leave me alone ," but these puzzles are sometimes called "the inverse Sudoku," although they are not a Sudoku variety. The book starts with an introduction and a detailed description of solving techniques and examples. In this book there are 150 puzzles in 6 levels of difficulty, ranging in sizes from 5x5 up to a humongous 20x20. Solutions are also included.

Diagonal Sudoku (Sudoku X) puzzles add another twist to your favorite game: both diagonals must contain all digits from 1 to 9 precisely once. This additional rule forces you to use new solving methods which are explained in the introduction. The books contains 200 puzzles split into 5 levels of difficulty. None of the puzzles are too easy and they cannot be solved without using the "X" rule.

Hidoku is not Sudoku. It's a brand new puzzle game, played on a square or rectangle of any size. Your goal is to fill in the missing numbers from 1 to the maximum number (which is circled) by following one simple rule: consecutive numbers must touch each other either horizontally or vertically or diagonally. In this book there are 150 of these puzzles, which are all solvable by logic and no guessing is ever required.

Same format, same difficulties, NEW puzzles Another sequel in the Killer Sudoku series of books from DJAPE. Brand new puzzles, with the same intensity and intricacy as the old ones. There are no trivial puzzles in this book - the accent is again on moderate and difficult puzzles. Contents: - 100 Killer Sudoku - 10 Killer Sudoku X - 10 Killer Sudoku with diagonal cages - 30 ZERO Killer Sudoku (blank cages)

Volume 3 of the CalcuDoku series of books by DJAPE. All puzzles in this book are NEW and never published before CalcuDoku, or "Square Wisdom," puzzles are also known under many different names. The name might be different, but the puzzles are of the same kind and ever so exciting These Sudoku-like puzzles require you to use all four basic arithmetic operations: +, -, * and /. One must develop new skills and find new techniques in order to solve them. In this book there are 200 puzzles ranging from 5x5 to 9x9 in size. In some puzzles some operators are removed, just to make it a little more...