This paper is a case study on the use of educational digital games to elementary pupils and deals with games that promote algorithmic thinking as well as the basic principles of programming. The study involved 94 young pupils who worked in pairs (Pair Programming) trying to solve puzzle games from code. org website during their visit to the University of Peloponnese in the context of the European Code Week. Factors such as satisfaction, evaluation of perceived knowledge and willingness to use games in future in the learning process were examined. Furthermore it’s discussed whether a short activity like this can result to long term motivation of pupils. The article concludes that:(a) the pupils enjoyed the games and wished to repeat corresponding activities.(b) They considered that by playing, they acquired basic skills and knowledge as far as programming principles were concerned.(c) They preferred Pair Programming and estimated that they could learn better by assisting one another. Finally, it seems that the few hours visit was not enough to motivate most pupils to carry on with the activities at home by themselves.