This project explores the use of serious games (called “apps”) by experiments conducted by teachers and their pupils (from upper primary school to lower secondary school), in permanent contact with a team of researchers and academic advisors, and supported by an in-service training programme developed for this purpose. Everyone works together (teachers, researchers, trainers) in order to identify good practices, and then to disseminate them within the participating organizations. The analysis of this iterative process is at the heart of the action research project. This includes also the analysis and improvement of the apps used and tested in this process. The experimenter-teachers (75 teachers from 5 countries) links together across the project (European dimension). The project team consists of: Direction de l’Enseignement catholique de la Mayenne (UDOGEC FR), University of Almeria (SP), St Patrick’s College (a college of Dublin City University IRL), Zapadoceska Univerzita V Plzni (West bohemia University Pilsen CZ), Univerza V Ljubljana (Faculty of Education SL).