CalcuDoku Game OnlineCalcuDoku is a free game at Infofully. This game is another clone of a famous game known as KenDoku. You can play this game in different modes. You can choose one from 4x4, 5x5 and 6x6 as per your expertise. You need to bring numbers 1 to N once in each row and column by filling digits in all empty squares. Game Controls: Play this game with the mouse. Click on an empty square and choose the option which is correct. However, you can see solutions as well from the bar which is shown on the upper side of the puzzle.