Educational robotics is increasingly emerging as an educational approach to support the development of STEM education and the development of 21st-century skills such as critical thinking, creativity, collaboration, computational thinking, coding, algorithmic thinking. Ministries, policy makers, educators, and stakeholders are always looking for new strategies and teaching methodologies and approaches for developing these skills in students. By using open robotics technologies, students explore, invent, discover, and engage in real problems and situations. This chapter presents the Open Robotics in Education Competition in Greece and investigates its effect on the development of the pre-mentioned skills in students and on the development of STEM education. It describes the organization of a national competition, team formation for accomplishing project activities, and discusses their relation to the curriculum. The chapter concludes with listing online resources and discussing statistics collected by during and after the competition.