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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
"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 sa
The Sudoku craze continues! And now, players are ready for a real challenge. From the hardest, 300 puzzles we dare you to solve. All from the editors at Nikoli Publishing, the Japanese company that invented the game. Most Sudoku puzzles are created by com