Sudoku is defined by Merriam-Webster as a 9-by-9 grid puzzle in which the grid is divided into 3-by-3 boxes. Every row, column and box must contain the numbers one through nine, no repeats. Need a ...

"Sudoku is a puzzle with pure logic," Shortz says about the American invention. "It has a grid of 9-by-9 divided into nine 3-by-3 boxes. The object is to put the numbers into each box, row and ...

Thomas Snyder (aka Dr. Sudoku) is a three-time World Sudoku Champion and five-time US Puzzle Champion, as well as the author of several books of puzzles. His puzzles are hand-crafted, with ...