Let's play was a mobility project of young people and youth workers. In this project we wanted to focus on youth key competencies development. Young people often don't realize which abilities and skills they have, they can't indetify them, and feel strong aversion against formal educational systems. But in their leisure time they like playing games. Apart from fun games offer many possibilities also for key competencies development. Our intention was to organize a training course for youth workers focused on key competencies development methods through games and afterwards together with them to organize a youth exchange focused on traditional games of their countries. The main goal of the project was to teach youth workers how to use game principles for key competencies development and identification a show young people that game is, apart from fun, also effective tool for gaining skills needed for their entrance to labour market. There were youth workers and youhg people from following countries in both activities: the Czech republic, Romania, Hungary, Poland, Slovakia, Spain, Greece, Italy, Turkey and Belgium. The training course was set for 24 youth workers, who wanted to develop their competencies in the field of using game programmes as a way for key competencies development. Training course was focused on the 4 main competencies: teamwork, effective communication, stress resistance and solving problems. Participants were trying different kind of games - board games, outdoor games, non-conventional games - and through reflexions they described how the competence is being developed. They also gained all information necessary for the realisation of similar programmes. At the end of the training course, youth workers tried gained competencies in practise and together with the group of young people, they work with, they prepared typical games of their countries for following youth exchange. During the exchange young people got to know these games and they also tried to organize game event for primary school pupils, where the most succesful games were prresented. At the end of the exchange young people have understood games not only as a way for fun but also as a useful helper in development of skills they need for their entrance to labour market. In the end of the project, participating organisations have gained trained youth workers who have all copetencies for realization of similar programmes for the groups of young people, they work with, in their countries.