sets and maps againthere will be some interesting programming problem challenges in this including optimization of the tic tac toe game first presented in the last and sudoku puzzle solver read on to discover what you need to know to solve these interesting problems playing sudoku many people enjoy solving sudoku puzzles to solve sudoku puzzle you must find the correct numbers to fill matrix all numbers must be - each row must have one each of - in it the same is true for each column finallythere are nine squares within the matrix that must also have each of - in them to beginyou are given puzzle with some of the locations known as shown in fig your job is to find the rest of the numbers given the numbers that already appear in the puzzle common way to solve these puzzles is by the process of elimination it helps to write down the possible values for puzzle and then eliminate the possible values one by one for instancethe puzzle above can be annotated with possible values in for the unknowns as shown in fig to begin solving the puzzlewe can immediately eliminate and from the second column of the puzzle for those cells that do not contain or none of those numbers could appear in any other cell in the second column because they are already known likewisethe numbers and can be eliminated from some cells fig sudoku puzzle this copy belongs to 'acha