Crossword puzzle enthusiasts and puzzle fans are flocking to Sudoku, a game similar to a crossword puzzle but with numbers instead of letters. "Sudoku" is an amalgamation of the Japanese words for "single" and "number", resulting in a mathematical game. Easy to learn, sudoku requires no calculations yet provides a staggering variety of logic situations. Deceptively simple in concept, Sudoku can become surprisingly difficult and truly addictive! The object of the game is to complete empty squares so that the digits 1 through 9 appear only once in every row, column and individual block.