noun. A puzzle in which a grid consisting of several regions is to be filled with numbers so that every row, column, and region contains only one instance of each number. The most common format is a grid of nine rows and columns that are divided into nine smaller regions of three rows and three columns into which the numbers 1 through 9 must be placed.

noun. A type of puzzle whose completion requires each of typically nine rows and columns and each of as many usually square subregions to contain, without duplication, 1 up to 9 or the grid dimension.

noun. a number puzzle in which the numbers 1 through 9 must be placed into a grid of cells so that each row or column contains only one of each number

"For everybody who wants to try out something new in sudoku, try shendoku, using the sudoku rules but playing two people, one against the other, like battleshipps."

Cross Sums  Latin square  hitori  kakuro  magic square  

sudokuist  

mystifier  puzzle  puzzler  teaser  

4th  algebraical  back-to-back  crossword  cutting-out  

Number Place