Sudoku (Japanese), sometimes spelled Su Doku, is a logic-based placement puzzle, also known as Number Place in the United States. The aim of the canonical puzzle is to enter a numerical digit from 1 through 9 in each cell of a 9?#9 grid made up of 3?#3 subgrids (called "regions"), starting with various digits given in some cells (the "givens"). Each row, column, and region must contain only one instance of each numeral... Eureka Information Systems Ltd :: idoku :: eureka :: information :: systems :: ltd :: games :: puzzles :: idoku deluxe :: iDoku