The puzzle a 16 x 16 grid made up of 4 x 4 subgrids (called "regions"). Some cells already contain numbers, known as "givens". The goal is to fill in the empty cells, one number in each, so that each column, row, and region contains the numbers 1 through 16 exactly once. Each number in the solution therefore occurs only once in each of three "directions", hence the "single numbers" implied by the puzzle's name.

Killer Sudoku is a mix of Sudoku and Kakuro. Your goal is the same as in regular sudoku: fill every row, column and 3x4 region with the numbers 1-12 once. The objective is to fill the grid with numbers from 1 to 12 in a way that the following conditions are met: Each row, column, and nonet contains each number exactly once. The sum of all numbers in a cage must match the small number printed in its corner. No number appears more than once in a cage.

Hard Sudoku puzzle book is a perfect funny Sudoku book for adults. Would you like to improve your logical skills? Love hard Sudoku puzzles? Then you'll love this book! Why play Sudoku? ✓ Sudoku gives your brain the ultimate workout. ✓ It keeps you and your mind healthy and productive. ✓ It helps to maintain and improve your memory. ✓ It also can increase your concentration and focus. 400 enjoyable Hard Sudoku puzzles Hard level: 200 puzzles Extremely Hard level: 200 puzzles Keeps your mind active and performing well. Suitable for all levels: beginner to expert

The puzzle a 16 x 16 grid made up of 4 x 4 subgrids (called "regions"). Some cells already contain numbers, known as "givens". The goal is to fill in the empty cells, one number in each, so that each column, row, and region contains the numbers 1 through 16 exactly once. Each number in the solution therefore occurs only once in each of three "directions", hence the "single numbers" implied by the puzzle's name.

✮ 55% OFF for Bookstores! LAST DAYS ✮ SUDOKU PUZZLES 400 Puzzle For Adults Experts Difficult Challenging Extreme Puzzle Games Brain WIDE SHEET GAMES 9X9 HARD LEVEL WITH SOLUTIONS 400 GAMES - The pages are 8.5 x 11 wide. Buy it NOW and let your customers get addicted to this amazing Book

This Sudoku book is not for the faint of heart! This is truly a Sudoku book like no other. With 400 of the hardest puzzles ever created, it is guaranteed to provide you with hours and hours of mind-melting fun. This awesome puzzle book is designed for experienced puzzle solvers who are looking for an extreme challenge. Exercise your brain, improve your concentration and stimulate your mind with these challenging puzzles. Frustrating, exasperating and downright maddening at times, these Sudoku puzzles will ultimately leave you satisfied and asking for more. If you are looking for a Sudoku book that will challenge your puzzle solving skills, all while helping to improve logical thinking, concentration and memory, scroll up and click the "Add to Cart" button to order this great Sudoku book today! Large print so that the puzzles strain your brain and not your eyes. Answer keys available for every single puzzle. Step up to the challenge -- IF YOU DARE! Be sure to check the Super Brain Puzzles page for more puzzle solving options. Benefits of SUDOKU Sudoku is a puzzle game consisting of numbers (or letters or objects). Like any game that can take possession of our students, playing Sudoku has all the elements of a good puzzle game: fun, excitement, and mental challenge. It is simply addictive - in a good and positive sense. However, in addition to the recreational values that Sudoku offers avid gamers, it also offers to develop more than your students' numerical skills. Cognitive Assessment Cognitive assessment of the grids, in particular the numbers given within the grids, develops the student's skill in identifying numbers in specific columns and retaining these numbers where necessary, in order to arrive at the correct numerical answer. Elimination By assessing which numbers are already given in particular squares in Sudoku grids, the student can employ the process of eliminating these given numbers to arrive at possible numerical answers. Logical Thinking With the numbers already given and the grids that have to be filled with numbers that have not yet been eliminated as the possible answers, the student can develop such logical thinking skills as deduction and induction. Analysis To arrive at the possible numerical answers, the student needs to analyze using the processes of elimination and trying out a number to see if it fits into the grid.

300 SUDOKU Expert difficulty Fun Puzzles to Boost Your Brain Power! Perfect Gift for your kids, mom, dad, senior, friends and family This Book Contains: 300 Expert Level SUDOKU Puzzles with solution 6 SUDOKU Puzzles per page - Full of Fun and enjoy playing 6 Solutions per page at the end of book Premium matte cover design Large Printed on high quality Paper Perfectly Large sized at 8.5" x 11" Paperback Add To Cart Today! and Enjoy SUDOKU For more Fun Puzzle, Please click on Author name to check it out. Thanks