This paper examines the Space Treasure outdoor game as part of the innovative Playful Learning Environment (PLE). The Space Treasure game was designed for educational contexts with an aim to increase children’s physical activity and to enable learning through play in an informal setting. The game concept was planned for one playground device, the wave platform within the PLE. The basic idea of the game is to move on the platform by making mathematical calculations in the imaginative frame of a space theme. The aim of the study was to test the game in its natural context–within the PLE in a school yard–and to evaluate it through the socio-cultural framework and through the concepts of playability, enjoyability, usability, and learnability. Thus, the theoretical background of the study involves a transdisciplinary approach to examine a novel game concept designed for schoolchildren. Children (N= 18), aged 10 to 12 years took part in the tests by playing the game in groups of 3 to 4 children. The technological properties were tested only through simulations. The playing was videotaped and the children were interviewed after the playing. The results reveal that children by and large enjoyed the game and gave creative suggestions for making variations of it. According to the results also social collaboration seemed to have been fruitful during game sessions. Games that promote meaningful learning are valuable because a “new generation” is emerging, demanding new teaching and learning methods. Therefore, this study is important for educators and researches as well as those who develop game and outdoor learning environment.