The "New York Times" crossword editor and puzzlemaster takes Sudoku to a whole new level with this collection featuring 100 brand-new (and just as addictive) puzzles, including kakuro.

Just when you thought it was safe to pick up a pencil Killer Su Doku is based on the original Su Doku grid, with the same rules and numbers—1 to 9—but with an added deadly twist. This time there is an element of arithmetic involved and there are few, if any, clues. The aim is to not only complete every row, column, and cube so that it contains the digits 1 to 9, but to also fill in the outlined cubes so they add up to the same number. Hints to solve the puzzle are hidden in the joined squares where only one combination of numbers applies. In the case of joined squares, if the printed number is 3, it should be 1 and 2 that go into the squares. Likewise, in the case of three joined squares, if the printed number is 6, the only combination possible is 1, 2, and 3. To add one final fiendish level, each puzzle also has a time worked out by its Japanese creators so you can try to beat the clock.

Sudoku is the new number puzzle craze sweeping the nation, and Sudoku X is the only puzzle collection to add diagonal play to the Sudoku formula.

Sudoku fans will welcome this bright new twist to the popular puzzles! Every one of these ingenious creations--from "Bold X" to "Rainbow Up"--makes colors and patterns part of the solving fun. And although each puzzle maintains the normal 9x9 grid and follows the basic rules of the game, every style adds an additional restriction to intensify the challenge. In "Worms," for example, swirly, squirmy shapes fill the grids; the numbers increase as you work your way from head to tail. "Even/Odd" features squares in two colors, depending on whether the number to fill it is even or odd. And in "Positional Board," no two of the red squares can be the same number. They're all lots of fun!

You don't need to be a math whiz to enjoy a great sudoku puzzle! Sharpen your mind and have some fun with this great collection of sudokus, including over 540 challenges across four difficulty levels (Warm-Up, Challenging, Tough, and the ultimate Samurai Sudoku!) A must-have for all Sudoku enthusiasts. OVER 500 PUZZLES & SOLUTIONS: Hours of fun and entertainment to enjoy! VARIETY OF LEVELS: From levels 1 to 3 increasing levels of difficulty including Warm Up, Challenging and Tough. When you are done, test your skills on the ultimate Samurai Sudoku Puzzle - 5 puzzles linked together by a central puzzle! Can you become a master samurai? LAY FLAT: Spiral-bound lays flat for ease of use at home or on the go. Whether your drinking your morning coffee, riding on the train or relaxing on vacation this sudoku book can go with you. MAKES A GREAT GIFT: For the sudoku puzzle lover, this books makes a great gift for any occasion! Birthday, stocking suffers, road trip or more, everyone will love it! BRAIN BUSTERS(TM) Part of the Brain Busters Puzzle Collection from Parragon & Cottage Door Press. Look for other books including word finds, crosswords, picture puzzles, and more.

Every puzzle in this book was selected to give you the greatest challenge and the most fun. They will twist and test your logic, challenge your IQ, stump your eyes, and force you to think harder than you ever have before to solve them. The BrainSnack® brand guarantees to train your brain, enhancing logic, imagination, creativity, and memory. This vibrant and appealing collection serves up a huge range of visual and verbal conundrums, from grids and pixel fun to concentration exercises and continuous line challenges.

3D Sudoku is the ultimate challenge for an fan of Sudoku puzzles. With three times as many numbers than normal Sudoku, follow the colored lines and complete the rows and boxes with the numbers 1-9. If youre a fan of Sudoku, then you will love this great new collection of over 300 ultra challenging 3D Sudoku puzzles!