The sharpest puzzle purveyor working in the English language, the great Martin Gardner wrote his Mathematical Games column for Scientific American in 1956.
What more could an avid Sudoku solver want than a puzzle for almost every day of the year? Here are puzzles of varying levels of difficulty that will entertain and challenge any player of this popular logic game.
Featuring a mix of puzzle styles, Irregular, Diagonal and Sum Sudoku, Ultimate Sudoku is perfect for both those new to the craze and those already hooked.