Sudoku, a fairly new type of puzzle from Japan, has very recently become popular wordwide. It involves placing the digits 1-9 into a 9x9 grid which is divided into nine 3x3 squares such as those below. Enough numbers are placed in the grid as clues to enable the puzzler to solve it. The object is to make all nine rows, all nine columns and all nine 3x3 squares each contain all nine digits. This means that no row, column or 3x3 square can have more than one of each digit.
Word Ways: Vol. 38
, Article 7.
Available at: https://digitalcommons.butler.edu/wordways/vol38/iss4/7