Point of the work is to study the game, its solving techniques and implementation of solving techniques by the use of C language Paper starts with the definition of game, description of rules and history of Kakuro. Aside from great importance of logic, combinatorics is mentioned and solving techniques are described. Additional elaboration of techniques is performed, work performance is shown on examples and technique implementation is described. Difference in performance of algorithm between people and computers is shown. Support functions are described at the end of the paper and although they are not directly linked to solving techniques, their importance is shown.