Lovatts Interactive and YouPlay are proud to announce the release of the new game, CALkuro. The new game continues in a range of some of the highest quality and best looking free maths games we've seen around the 'net. This style of puzzle, which uses some fundamental rules of Sudoku and incorporates a total for each group of numbers and distinct mathematical operations, has also been called Kendoku or KenKen in other parts of the world.