This popular Sudoku variant is known variously as Calcudoku, Mathdoku or KenKenTM. But whatever name you know it by, we’ve got thousands and thousands of unique puzzles of all sizes for you to enjoy.
Play for fun, or register a free account to compete against other players from all around the world in our monthly competitions. See if you have what it takes to make it into the Calcudoku Hall of Fame!
Calcudoku
