Over twenty-five years ago, Nikoli, a Japanese puzzle and game company, started publishing a curious logic puzzle called Sudoku. The result was magical and in recent years, Sudoku has spread from Japan to other countries. These newer puzzles, however, are often computer-generated and lack the simple beauty of handmade puzzles. Nikoli continues to nurture and develop Sudoku with handmade puzzles that contain the vital ingredient that make puzzles enjoyable--the sense of communication between solver and author. The best Sudoku make you concentrate, but aren't stressful.

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"The Best Puzzles Are Made by Happy Employees." So Ad Age describes the credo of Nikoli, the Japanese puzzle company that invented the Sudoku craze and supplies 100% of the puzzles published in Japanese newspapers and magazines. And when they say "made," they mean literally handmade--unlike the computer-generated puzzles found in other American Sudoku products.

And that's one of the features that makes THE ORIGINAL SUDOKU BOOK 2-- and THE ORIGINAL SUDOKU, published between seasons and already with 115,000 copies in print--unique. The books celebrate the compulsive joy of Sudoku...

The next step, like having a whole book of just Saturday Times crossword puzzles. Even more fiendish, even more fun, X-treme Sudoku proudly presents 320 puzzles rated "Difficult" to "Very Difficult." These are the toughest, knottiest, most demanding Sudoku out there--prepare to have your brain cells crackle, your pencils melt, your mind obsessed with numbers and squares.

No one is better than Nikoli at rounding up such a collection. A Japanese puzzle and game company that started the Sudoku craze over twenty years ago, Nikoli is known for creating the only handcrafted...